Ring finger domain;

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 767992469   13 ECPVCYEKFRDLEGAsRTLSCGHVFCHDCLVKYLLSTRvdgqvqrtlVCPICR 65
Cdd:pfam13639   2 ECPICLEEFEEGDKV-VVLPCGHHFHRECLDKWLRSSN---------TCPLCR 44

N1R/p28-like protein; Provisional

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 767992469   7 KDSSGSECPVCYEKFRDLEGASRTL----SCGHVFCHDCLVKYllstrvdgQVQRTlVCPICRyVTFLSKKSSRW 77
Cdd:PHA02929 170 NRSKDKECAICMEKVYDKEIKNMYFgilsNCNHVFCIECIDIW--------KKEKN-TCPVCR-TPFISVIKSRF 234

Ring finger domain;

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 767992469   13 ECPVCYEKFRDLEGAsRTLSCGHVFCHDCLVKYLLSTRvdgqvqrtlVCPICR 65
Cdd:pfam13639   2 ECPICLEEFEEGDKV-VVLPCGHHFHRECLDKWLRSSN---------TCPLCR 44

RING finger, HC subclass, found in SNF2 histone-linker PHD finger RING finger helicase (SHPRH) and similar proteins; SHPRH is a yeast RAD5 homolog found in mammals. It functions as an E3 ubiquitin-protein ligase that associates with proliferating cell nuclear antigen (PCNA), RAD18, and the ubiquitin-conjugating enzyme UBC13 (E2), and suppresses genomic instability by proliferating methyl methanesulfonate (MMS)-induced PCNA polyubiquitination. SHPRH contains a SWI/SNF helicase domain that is divided into N- and C-terminal parts by an insertion of a linker histone domain (H15), a PHD-finger, and a C3HC4-type RING-HC finger involved in the poly-ubiquitination of PCNA. This subfamily also includes tripartite motif-containing protein 15 (TRIM15). TRIM15, also known as RING finger protein 93 (RNF93), zinc finger protein 178 (ZNF178), or zinc finger protein B7 (ZNFB7), is a focal adhesion protein that regulates focal adhesion disassembly. It localizes to focal contacts in a myosin-II-independent manner by an interaction between its coiled-coil domain and the LD2 motif of paxillin. TRIM15 can also associate with coronin 1B, cortactin, filamin binding LIM protein1, and vasodilator-stimulated phosphoprotein, which are involved in actin cytoskeleton dynamics. As an additional component of the integrin adhesome, it regulates focal adhesion turnover and cell migration. TRIM15 belongs to the C-IV subclass of the TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil region, as well as a SPRY/B30.2 domain positioned C-terminal to the RBCC domain.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 767992469  14 CPVCyekFRDLEGASRTLSCGHVFCHDCLvkYLLSTRVDGQVQRTLVCPICRYVT 68
Cdd:cd16569    4 CPIC---ARPLGKQWSVLPCGHCFCLECI--AILIDQYAQSRRRSLKCPICRETT 53

RING finger, HC subclass, found in malin and similar proteins; Malin ("mal" for seizure in French), also known as NHL repeat-containing protein 1 (NHLRC1), or EPM2B, is a nuclear E3 ubiquitin-protein ligase that ubiquitinates and promotes the degradation of laforin (EPM2A encoding protein phosphatase). Malin and laforin operate as a functional complex that play key roles in regulating cellular functions such as glycogen metabolism, unfolded cellular stress response, and proteolytic processes. They act as pro-survival factors that negatively regulate the Hipk2-p53 cell death pathway. They also negatively regulate cellular glucose uptake by preventing plasma membrane targeting of glucose transporters. Moreover, they degrade polyglucosan bodies in concert with glycogen debranching enzyme and brain isoform glycogen phosphorylase. Furthermore, they, together with Hsp70, form a new functional complex that suppress the cellular toxicity of misfolded proteins by promoting their degradation through the ubiquitin-proteasome system. Defects in either malin or laforin may cause Lafora disease (LD), a fatal form of teenage-onset autosomal recessive progressive myoclonus epilepsy. In addition, malin may have function, independent of laforin, in lysosomal biogenesis and/or lysosomal glycogen disposal. Malin contains six NHL-repeat protein-protein interaction domains and a C3HC4-type RING-HC finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 767992469  13 ECPVCYEKFRDLEG-ASRTLSCGHVFCHDCLvkyllsTRVDGQVQRTLVCPICRYVT 68
Cdd:cd16516    2 ECKVCFEKYSHQQEhRPRNLPCGHVLCRECV------TALAHPRRSKLECPFCRKAC 52

RING-type zinc-finger; This zinc-finger is a typical RING-type of plant ubiquitin ligases.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 767992469   14 CPVCYEKFRDlegasRTLSCGHVFCHDCLVKYLLSTrvdgqvQRTLVCP 62
Cdd:pfam13445   1 CPICLELFTD-----PVLPCGHTFCRECLEEMSQKK------GGKFKCP 38

Ring finger; E3 ubiquitin-protein ligase activity is intrinsic to the RING domain of c-Cbl and is likely to be a general function of this domain; Various RING fingers exhibit binding activity towards E2 ubiquitin-conjugating enzymes (Ubc' s)

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 767992469    14 CPVCYEKFRDlegASRTLSCGHVFCHDCLVKYLLSTRVdgqvqrtlVCPIC 64
Cdd:smart00184   1 CPICLEEYLK---DPVILPCGHTFCRSCIRKWLESGNN--------TCPIC 40

RING finger, HC subclass, found in Saccharomyces cerevisiae histone E3 ligase 2 (HEL2) and similar proteins; HEL2 is an E3 ubiquitin-protein ligase that interacts with the E2 ubiquitin-conjugating enzyme UBC4 and histones H3 and H4. It plays an important role in regulating histone protein levels and also likely to contribute to the maintenance of genomic stability in the budding yeast. HEL2 can be phosphorylated by the DNA damage checkpoint kinase and histone protein regulator Rad53. This subfamily also includes Schizosaccharomyces pombe histone E3 ligase 1 (HEL1), also known as DNA-break-localizing protein 4 (dbl4), and Dictyostelium discoideum Ariadne-like ubiquitin ligase (RbrA). RbrA may act as an E3 ubiquitin-protein ligase that appears to be required for normal cell-type proportioning and cell sorting during multicellular development, and is also necessary for spore cell viability. Members of this subfamily contain an RBR domain that was previously known as RING-BetweenRING-RING domain or TRIAD [two RING fingers and a DRIL (double RING finger linked)] domain. Based on current understanding of the structural biology of RBR ligases, the nomenclature of RBR has been corrected as RING-BRcat (benign-catalytic)-Rcat (required-for-catalysis) recently. The RBR (RING1-BRcat-Rcat) domain uses an auto-inhibitory mechanism to modulate ubiquitination activity, as well as a hybrid mechanism that combines aspects from both RING and HECT E3 ligase function to facilitate the ubiquitination reaction. This model corresponds to the RING domain, a C3HC4-type RING-HC finger required for RBR-mediated ubiquitination.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 767992469  12 SECPVCYEKfRDLEGASrtLSCGHVFCHDCLVKYLLSTRVDGQVQRTLVCP 62
Cdd:cd16625    1 FECPICCDD-GELETFS--LECGHEFCVDCYSQYLTSKIKEEGEGCRITCP 48

RING finger, HC subclass, found in tripartite motif-containing protein TRIM25 and similar proteins; TRIM25, also known as estrogen-responsive finger protein (EFP), RING finger protein 147 (RNF147), or RING-type E3 ubiquitin transferase, is an E3 ubiquitin/ISG15 ligase that is induced by estrogen and is therefore particularly abundant in placenta and uterus. TRIM25 regulates various cellular processes through E3 ubiquitin ligase activity, transferring ubiquitin and ISG15 to target proteins. It mediates K63-linked polyubiquitination of retinoic acid inducible gene I (RIG-I) that is crucial for downstream antiviral interferon signaling. It is also required for melanoma differentiation-associated gene 5 (MDA5) and mitochondrial antiviral signaling (MAVS, also known as IPS-1, VISA, Cardiff) mediated activation of nuclear factor-kappaB (NF-kappaB) and interferon production. Upon UV irradiation, TRIM25 interacts with mono-ubiquitinated PCNA and promotes its ISG15 modification (ISGylation), suggesting a crucial role in termination of error-prone translesion DNA synthesis. TRIM25 also functions as a novel regulator of p53 and Mdm2. It enhances p53 and Mdm2 abundance by inhibiting their ubiquitination and degradation in 26S proteasomes. Meanwhile, it inhibits p53's transcriptional activity and dampens the response to DNA damage, and is essential for medaka development and this dependence is rescued by silencing of p53. Moreover, TRIM25 is involved in the host cellular innate immune response against retroviral infection. It interferes with the late stage of feline leukemia virus (FeLV) replication. Furthermore, TRIM25 acts as an oncogene in gastric cancer. Its blockade by RNA interference inhibits migration and invasion of gastric cancer cells through transforming growth factor-beta (TGF-beta) signaling, suggesting it presents a novel target for the detection and treatment of gastric cancer. In addition, TRIM25 acts as an RNA-specific activator for Lin28a/TuT4-mediated uridylation. TRIM25 belongs to the C-IV subclass of TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil region, as well as a B30.2/SPRY (SplA and ryanodine receptor) domain positioned C-terminal to the RBCC domain.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*....
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLVKyllstRVDGQVQRTLVCPICRyVTFLSK 72
Cdd:cd16597    8 CSICLELFKD----PVTLPCGHNFCGVCIEK-----TWDSQHGSEYSCPQCR-ATFPRR 56

RING finger, HC subclass, found in tripartite motif-containing proteins TRIM13, TRIM59 and similar proteins; TRIM13 and TRIM59, two closely related tripartite motif-containing proteins, belong to the C-V subclass of the TRIM (tripartite motif) family of proteins that are defined by an N-terminal RBCC (RING, Bbox, and coiled coil) domain, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil region, followed by a C-terminal transmembrane domain. TRIM13, also known as B-cell chronic lymphocytic leukemia tumor suppressor Leu5, leukemia-associated protein 5, putative tumor suppressor RFP2, RING finger protein 77 (RNF77), or Ret finger protein 2, is an endoplasmic reticulum (ER) membrane anchored E3 ubiquitin-protein ligase that interacts with proteins localized to the ER, including valosin-containing protein (VCP), a protein indispensable for ER-associated degradation (ERAD). TRIM59, also known as RING finger protein 104 (RNF104) or tumor suppressor TSBF-1, is a putative E3 ubiquitin-protein ligase that functions as a novel multiple cancer biomarker for immunohistochemical detection of early tumorigenesis.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYLLSTrvDGQVQRTLVCPICR 65
Cdd:cd16581    5 CSICYNIFDD----PKILPCSHTFCKNCLEKLLAAS--GYYLLASLKCPTCR 50

RING finger, HC subclass, found in tripartite motif-containing protein 32 (TRIM32) and similar proteins; TRIM32, also known as 72 kDa Tat-interacting protein, zinc finger protein HT2A, or BBS11, is an E3 ubiquitin-protein ligase that promotes degradation of several targets, including actin, PIASgamma, Abl interactor 2, dysbindin, X-linked inhibitor of apoptosis (XIAP), p73 transcription factor, thin filaments and Z-bands during fasting. It plays important roles in neuronal differentiation of neural progenitor cells, as well as in controlling cell fate in skeletal muscle progenitor cells. It reduces PI3K-Akt-FoxO signaling in muscle atrophy by promoting plakoglobin-PI3K dissociation. It also functions as a pluripotency-reprogramming roadblock that facilitates cellular transition towards differentiation by modulating the levels of Oct4 and cMyc. Moreover, TRIM32 is an intrinsic influenza A virus (IAV) restriction factor which senses and targets the polymerase basic protein 1 (PB1) for ubiquitination and protein degradation. It also plays a significant role in mediating the biological activity of the HIV-1 Tat protein in vivo, binds specifically to the activation domain of HIV-1 Tat, and can also interact with the HIV-2 and EIAV Tat proteins in vivo. Furthermore, TRIM32 regulates myoblast proliferation by controlling turnover of NDRG2 (N-myc downstream-regulated gene). It negatively regulates tumor suppressor p53 to promote tumorigenesis. It also facilitates degradation of MYCN on spindle poles and induces asymmetric cell division in human neuroblastoma cells. In addition, TRIM32 plays important roles in regulation of hyperactivities and positively regulates the development of anxiety and depression disorders induced by chronic stress. It also plays a role in regeneration by affecting satellite cell cycle progression via modulation of the SUMO ligase PIASy (PIAS4). Defects in TRIM32 leads to limb-girdle muscular dystrophy type 2H (LGMD2H), sarcotubular myopathies (STM) and Bardet-Biedl syndrome. TRIM32 belongs to the C-VII subclass of the TRIM (tripartite motif)-NHL family that is defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil domain, as well as a NHL (named after proteins NCL-1, HT2A and Lin-41 that contain repeats folded into a six-bladed beta propeller) repeat domain positioned C-terminal to the RBCC domain. The NHL domain mediates the interaction with Argonaute proteins and consequently allows TRIM32 to modulate the activity of certain miRNAs.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 767992469  13 ECPVCYEKFRDLEGASRTLSCGHVFCHDCLVKYLLSTRvdgqvQRTLVCPICRYV 67
Cdd:cd16587    2 ECPICLESFDEGQLRPKLLHCGHTICEQCLEKLLASLS-----INGVRCPFCRKV 51

N1R/p28-like protein; Provisional

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 767992469   7 KDSSGSECPVCYEKFRDLEGASRTL----SCGHVFCHDCLVKYllstrvdgQVQRTlVCPICRyVTFLSKKSSRW 77
Cdd:PHA02929 170 NRSKDKECAICMEKVYDKEIKNMYFgilsNCNHVFCIECIDIW--------KKEKN-TCPVCR-TPFISVIKSRF 234

RING finger, H2 subclass, found in Arabidopsis thaliana RING-H2 finger A1a (RHA1A), A1b (RHA1B) and similar proteins; This subfamily includes Arabidopsis thaliana RHA1A, RHA1B and XERICO. RHA1A is a probable E3 ubiquitin-protein ligase that may possess E3 ubiquitin ligase activity in vitro. RHA1B possesses E3 ubiquitin-protein ligase activity when associated with the E2 enzyme UBC8 in vitro. XERICO functions on abscisic acid homeostasis at post-translational level, probably through ubiquitin/proteasome-dependent substrate-specific degradation. Members of this subfamily contain a C3H2C3-type RING-H2 finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 767992469  13 ECPVCYEKFRDLEGASRTLSCGHVFCHDCLVKYLlstrvdgqVQRTLVCPICR 65
Cdd:cd23121    3 CCAICLSDFNSDEKLRQLPKCGHIFHHHCLDRWI--------RYNKITCPLCR 47

RING finger, HC subclass, found in Arabidopsis thaliana protein KEEP ON GOING (KEG) and similar proteins; KEG, also called RING-type E3 ubiquitin transferase KEG, is a RING E3 ubiquitin-protein ligase that mediates E2-dependent protein ubiquitination. It is essential for Arabidopsis growth and development. It acts as a negative regulator of abscisic acid signaling. It is required for ABSCISIC ACID-INSENSITIVE5 (ABI5) degradation, by mediating its ubiquitination. Together with EDR1, KEG may regulate endocytic trafficking and/or the formation of signaling complexes on trans-Golgi network (TGN)/ early endosome (EE) vesicles during stress responses. KEG is a multidomain protein that includes a C3HC4-type RING-HC finger, a kinase domain, ankyrin repeats, and 12 HERC2-like (for HECT and RCC1-like) repeats.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 767992469  13 ECPVCYEKFRDLEGASRTLSCGHVFCHDCLVKyLLSTRVDgqvqRTLVCPICRYVT 68
Cdd:cd23140    3 ECSVCSEGYNEDERVPLLLQCGHTFCKDCLSQ-MFIRCTD----LTLKCPRCRQSV 53

RING finger, HC subclass, found in tripartite motif-containing proteins, TRIM7, TRIM11 and TRIM27, and similar proteins; TRIM7, TRIM11 and TRIM27, closely related tripartite motif-containing proteins, belong to the C-IV subclass of the TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox2, and a coiled coil region, as well as a SPRY/B30.2 domain positioned C-terminal to the RBCC domain. TRIM7, also known as glycogenin-interacting protein (GNIP) or RING finger protein 90 (RNF90), is an E3 ubiquitin-protein ligase that mediates c-Jun/AP-1 activation by Ras signalling. Its phosphorylation and activation by MSK1 in response to direct activation by the Ras-Raf-MEK-ERK pathway can stimulate TRIM7 E3 ubiquitin ligase activity in mediating Lys63-linked ubiquitination of the AP-1 coactivator RACO-1, leading to RACO-1 protein stabilization. Moreover, TRIM7 binds and activates glycogenin, the self-glucosylating initiator of glycogen biosynthesis. TRIM11, also known as protein BIA1, or RING finger protein 92 (RNF92), is an E3 ubiquitin-protein ligase involved in the development of the central nervous system. It is overexpressed in high-grade gliomas and promotes proliferation, invasion, migration and glial tumor growth. TRIM11 acts as a potential therapeutic target for congenital central hypoventilation syndrome (CCHS) by mediating the degradation of CCHS-associated polyalanine-expanded Phox2b. TRIM11 modulates the function of neurogenic transcription factor Pax6 through the ubiquitin-proteosome system, and thus plays an essential role for Pax6-dependent neurogenesis. It also binds to and destabilizes a key component of the activator-mediated cofactor complex (ARC105), humanin, a neuroprotective peptide against Alzheimer's disease-relevant insults, and further regulates ARC105 function in transforming growth factor beta (TGFbeta) signaling. Moreover, TRIM11 negatively regulates retinoic acid-inducible gene-I (RIG-I)-mediated interferon-beta (IFNbeta) production and antiviral activity by targeting TANK-binding kinase-1 (TBK1). It may contribute to the endogenous restriction of retroviruses in cells. It enhances N-tropic murine leukemia virus (N-MLV) entry by interfering with Ref1 restriction. It also suppresses the early steps of human immunodeficiency virus HIV-1 transduction, resulting in decreased reverse transcripts. TRIM27, also known as RING finger protein 76 (RNF76), RET finger protein (RFP), or zinc finger protein RFP, is a nuclear E3 ubiquitin-protein ligase that is highly expressed in testis and in various tumor cell lines. Expression of TRIM27 is associated with prognosis of colon and endometrial cancers. TRIM27 was first identified as a fusion partner of the RET receptor tyrosine kinase. It functions as a transcriptional repressor and associates with several proteins involved in transcriptional activity, such as enhancer of polycomb 1 (Epc1), a member of the Polycomb group proteins, and Mi-2beta, a main component of the nucleosome remodeling and deacetylase (NuRD) complex, and the cell cycle regulator retinoblastoma protein (RB1). It also interacts with HDAC1, leading to downregulation of thioredoxin binding protein 2 (TBP-2), which inhibits the function of thioredoxin. Moreover, TRIM27 mediates Pax7-induced ubiquitination of MyoD in skeletal muscle atrophy. In addition, it inhibits muscle differentiation by modulating serum response factor (SRF) and Epc1. TRIM27 promotes a non-canonical polyubiquitination of PTEN, a lipid phosphatase that catalyzes PtdIns(3,4,5)P3 (PIP3) to PtdIns(4,5)P2 (PIP2). It is an IKKepsilon-interacting protein that regulates IkappaB kinase (IKK) function and negatively regulates signaling involved in the antiviral response and inflammation. TRIM27 also forms a protein complex with MBD4 or MBD2 or MBD3, and thus plays an important role in the enhancement of transcriptional repression through MBD proteins in tumorigenesis, spermatogenesis, and embryogenesis. It is a component of an estrogen receptor 1 (ESR1) regulatory complex that is involved in estrogen receptor-mediated transcription in MCF-7 cells.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLvkyllsTRVDGQVQRTLVCPICR 65
Cdd:cd16594    8 CPICLDYFTD----PVTLDCGHSFCRACI------ARCWEEPETSASCPQCR 49

RING finger, HC subclass, found in two RING fingers and DRIL [double RING finger linked] 1 (TRIAD1); TRIAD1, also known as ariadne-2 (ARI-2), protein ariadne-2 homolog, Ariadne RBR E3 ubiquitin protein ligase 2 (ARIH2), or UbcM4-interacting protein 48, is an RBR-type E3 ubiquitin-protein ligase that catalyzes the formation of polyubiquitin chains linked via lysine-48, as well as lysine-63 residues. Its auto-ubiquitylation can be catalyzed by the E2 conjugating enzyme UBCH7. TRIAD1 has been implicated in hematopoiesis, specifically in myelopoiesis, as well as in embryogenesis. It functions as a regulator of endosomal transport and is required for the proper function of multivesicular bodies. It also acts as a novel ubiquitination target for proteasome-dependent degradation by murine double minute 2 (MDM2). As a proapoptotic protein, TRIAD1 promotes p53 activation, and inhibits MDM2-mediated p53 ubiquitination and degradation. Furthermore, TRIAD1 can inhibit the ubiquitination and proteasomal degradation of growth factor independence 1 (Gfi1), a transcriptional repressor essential for the function and development of many different hematopoietic lineages. TRIAD1 contains an RBR domain that was previously known as RING-BetweenRING-RING domain or TRIAD [two RING fingers and a DRIL (double RING finger linked)] domain. Based on current understanding of the structural biology of RBR ligases, the nomenclature of RBR has been corrected as RING-BRcat (benign-catalytic)-Rcat (required-for-catalysis) recently. The RBR (RING1-BRcat-Rcat) domain uses an auto-inhibitory mechanism to modulate ubiquitination activity, as well as a hybrid mechanism that combines aspects from both RING and HECT E3 ligase function to facilitate the ubiquitination reaction. This model corresponds to the RING domain, a C3HC4-type RING-HC finger required for RBR-mediated ubiquitination.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 767992469  13 ECPVCYEKFRDLEgaSRTLSCGHVFCHDCLVKYlLSTRVDGQVQRTLVCP 62
Cdd:cd16773    2 TCGVCCEDVPKDE--LFSLACGHYFCNDCWKQY-LTVKIKDGVSTGIECM 48

RING finger, H2 subclass, found in BRCA1-associated protein (BRAP2) and similar proteins; BRAP2, also known as impedes mitogenic signal propagation (IMP), RING finger protein 52, or renal carcinoma antigen NY-REN-63, is a novel cytoplasmic protein interacting with the two functional nuclear localization signal (NLS) motifs of BRCA1, a nuclear protein linked to breast cancer. It also binds to the SV40 large T antigen NLS motif and the bipartite NLS motif found in mitosin. BRAP2 serves as a cytoplasmic retention protein and plays a role in the regulation of nuclear protein transport. It contains an N-terminal RNA recognition motif (RRM), also known as RBD (RNA binding domain) or RNP (ribonucleoprotein domain), followed by a C3H2C3-type RING-H2 finger and a UBP-type zinc finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 767992469  14 CPVCYEKFRDLEGASRTLSCGHVFCHDCLVKYLLSTrvdgqvqrtlvCPICRY 66
Cdd:cd16457    3 CPVCLERMDESVSGILTILCNHSFHCSCLSKWGDSS-----------CPVCRY 44

RING finger, HC subclass, found in RING finger and transmembrane domain-containing protein RNFT1, RNFT2, and similar proteins; Both RNFT1 and RNFT2 are multi-pass membrane proteins containing a C3HC4-type RING-HC finger. Their biological roles remain unclear.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYLlstrvdgqvQRTLVCPICR 65
Cdd:cd16532    3 CPICQDEFKD----PVVLRCKHIFCEDCVSEWF---------ERERTCPLCR 41

RING finger, HC subclass, found in tripartite motif-containing protein 39 (TRIM39) and similar proteins; TRIM39, also known as RING finger protein 23 (RNF23) or testis-abundant finger protein, is an E3 ubiquitin-protein ligase that plays a role in controlling DNA damage-induced apoptosis through inhibition of the anaphase promoting complex (APC/C), a multiprotein ubiquitin ligase that controls multiple cell cycle regulators, including cyclins, geminin, and others. TRIM39 also functions as a regulator of several key processes in the proliferative cycle. It directly regulates p53 stability. It modulates cell cycle progression and DNA damage responses via stabilizing p21. Moreover, TRIM39 negatively regulates the nuclear factor kappaB (NFkappaB)-mediated signaling pathway through stabilization of Cactin, an inhibitor of NFkappaB- and Toll-like receptor (TLR)-mediated transcription, which is induced by inflammatory stimulants such as tumor necrosis factor alpha. Furthermore, TRIM39 is a MOAP-1-binding protein that can promote apoptosis signaling through stabilization of MOAP-1 via the inhibition of its poly-ubiquitination process. TRIM39 belongs to the C-IV subclass of the TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil region, as well as a B30.2/SPRY (SplA and ryanodine receptor) domain positioned C-terminal to the RBCC domain.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYLlstrvdGQVQRTLVCPIC 64
Cdd:cd16601    4 CSLCKEYLKD----PVIIECGHNFCRACITRFW------EELDGDFPCPQC 44

RING finger, H2 subclass, found in RING finger protein 181 (RNF181) and similar proteins; RNF181, also known as HSPC238, is a platelet E3 ubiquitin-protein ligase containing a C3H2C3-type RING-H2 finger. It interacts with the KVGFFKR motif of platelet integrin alpha(IIb)beta3, suggesting a role for RNF181-mediated ubiquitination in integrin and platelet signaling. It also suppresses the tumorigenesis of hepatocellular carcinoma (HCC) through the inhibition of extracellular signal-regulated kinase/mitogen-activated protein kinase (ERK/MAPK) signaling in the liver.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 767992469  13 ECPVCYEKFrDLEGASRTLSCGHVFCHDCLVKYLlstrvdgqvQRTLVCPICRY 66
Cdd:cd16669    1 KCPICLLEF-EEGETVKQLPCKHSFHSDCILPWL---------GKTNSCPLCRH 44

Modified RING finger, C3HGC3-type, found in RING finger and WD repeat domain-containing protein 3 (RFWD3) and similar proteins; RFWD3, also known as RING finger protein 201 (RNF201) or FLJ10520, is an E3 ubiquitin-protein ligase that forms a complex with Mdm2 and p53 to synergistically ubiquitinate p53 and acts as a positive regulator of p53 stability in response to DNA damage. It is phosphorylated by checkpoint kinase ATM/ATR and the phosphorylation mutant fails to stimulate p53 ubiquitination. RFWD3 also functions as a novel replication protein A (RPA)-associated protein involved in DNA replication checkpoint control. RFWD3 contains an N-terminal SQ-rich region followed by a RING finger domain that exhibits robust E3 ubiquitin ligase activity toward p53, a coiled-coil domain and three WD40 repeats in the C-terminus, the latter two of which may be responsible for protein-protein interaction. The RING finger in this family is a modified C3HGC3-type RING finger, but not a canonical C3H2C3-type RING-H2 finger or C3HC4-type RING-HC finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 767992469  11 GSECPVCYEKFRdLEGASR--TLSCGHVFCHDCLVKYLlstrvDGQVQRtlvCPICR 65
Cdd:cd16450    2 GNTCPICFEPWT-SSGEHRlvSLKCGHLFGYSCIEKWL-----KGKGKK---CPQCN 49

Variant RING finger, HC subclass (C4C4-type), found in retinoblastoma-binding protein 6 (RBBP6) and similar proteins; RBBP6, also known as proliferation potential-related protein, protein P2P-R, retinoblastoma-binding Q protein 1 (RBQ-1), or p53-associated cellular protein of testis (PACT), is a nuclear E3 ubiquitin-protein ligase involved in multiple processes, such as the control of gene expression, mitosis, cell differentiation, and cell apoptosis. It plays a role in both promoting and inhibiting apoptosis in many human cancers, including esophageal, lung, hepatocellular, and colon cancers, familial myeloproliferative neoplasms, as well as in human immunodeficiency virus-associated nephropathy (HIVAN). It functions as an Rb- and p53-binding protein that plays an important role in chaperone-mediated ubiquitination and possibly in protein quality control. It acts as a scaffold protein to promote the assembly of the p53/TP53-MDM2 complex, resulting in an increase of MDM2-mediated ubiquitination and degradation of p53/TP53, and leading to both apoptosis and cell growth. It is also a double-stranded RNA-binding protein that plays a role in mRNA processing by regulating the human polyadenylation machinery and modulating expression of mRNAs with AU-rich 3' untranslated regions (UTRs). Moreover, RBBP6 ubiquitinates and destabilizes the transcriptional repressor ZBTB38 that negatively regulates transcription and levels of the MCM10 replication factor on chromatin. Furthermore, RBBP6 is involved in tunicamycin-induced apoptosis by mediating protein kinase (PKR) activation. RBBP6 contains an N-terminal ubiquitin-like domain and a C4C4-type RING finger, whose overall folding is similar to that of the typical C3HC4-type RING-HC finger. RBBP6 interacts with chaperones Hsp70 and Hsp40 through its N-terminal ubiquitin-like domain. It promotes the ubiquitination of p53 by Hdm2 in an E4-like manner through its RING finger. It also interacts directly with the pro-proliferative transcription factor Y-box-binding protein-1 (YB-1) via its RING finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 767992469  14 CPVCYEKFRDlegASRTLSCGHVFCHDCLVKYLLSTrvdgqvqrTLVCPICR 65
Cdd:cd16620    6 CPICKDLMKD---AVLTPCCGNSFCDECIRTALLEE--------DFTCPTCK 46

Modified RING finger, HC subclass (C3HC3D-type), found in tripartite motif-containing protein 23 (TRIM23) and similar proteins; TRIM23, also known as ADP-ribosylation factor domain-containing protein 1, GTP-binding protein ARD-1, or RING finger protein 46 (RNF46), is an E3 ubiquitin-protein ligase belonging to the C-IX subclass of the TRIM (tripartite motif) family of proteins that are defined by an N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a modified C3HC3D-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil region, as well as C-terminal ADP ribosylation factor (ARF) domains. TRIM23 is involved in nuclear factor (NF)-kappaB activation. It mediates atypical lysine 27 (K27)-linked polyubiquitin conjugation to NF-kappaB essential modulator NEMO, also known as IKKgamma, which plays an important role in the NF-kappaB pathway, and this conjugation is essential for TLR3- and RIG-I/MDA5-mediated antiviral innate and inflammatory responses. It also regulates adipocyte differentiation via stabilization of the adipogenic activator peroxisome proliferator-activated receptor gamma (PPARgamma) through atypical ubiquitin conjugation to PPARgamma. Moreover, TRIM23 interacts with and polyubiquitinates yellow fever virus (YFV) NS5 to promote its binding to STAT2 and trigger type I interferon (IFN-I) signaling inhibition.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 767992469  13 ECPVCYEKFR-DLEGASRTLSCGHVFCHDCLVKYLLSTrvdgqvqRTLVCPICR 65
Cdd:cd16645    3 ECGVCEDVFSlQGDKVPRLLLCGHTVCHDCLTRLPLHG-------RAVRCPFDR 49

RING finger, HC subclass, found in RING finger protein 14 (RNF14) and similar proteins; RNF14, also known as androgen receptor-associated protein 54 (ARA54), HFB30, or Triad2 protein, is an RBR-type E3 ubiquitin-protein ligase that is highly expressed in the testis and interacts with class III E2s (UBE2E2, UbcH6, and UBE2E3). Its differential localization may play an important role in testicular development and spermatogenesis in humans. RNF14 functions as a transcriptional regulator of mitochondrial and immune function in muscle. It is a ligand-dependent androgen receptor (AR) co-activator and may also may participate in enhancing cell cycle progression and cell proliferation via induction of cyclin D1. Moreover, RNF14 is crucial for colon cancer cell survival. It acts as a new enhancer of the Wnt-dependent transcriptional outputs that acts at the level of the T-cell factor/lymphoid enhancer factor (TCF/LEF)-beta-catenin complex. RNF14 contains an N-terminal RWD domain and a C-terminal RBR domain. The RBR domain was previously known as RING-BetweenRING-RING domain or TRIAD [two RING fingers and a DRIL (double RING finger linked)] domain. Based on current understanding of the structural biology of RBR ligases, the nomenclature of RBR has been corrected as RING-BRcat (benign-catalytic)-Rcat (required-for-catalysis) recently. The RBR (RING1-BRcat-Rcat) domain uses an auto-inhibitory mechanism to modulate ubiquitination activity, as well as a hybrid mechanism that combines aspects from both RING and HECT E3 ligase function to facilitate the ubiquitination reaction. This model corresponds to the RING domain, a C3HC4-type RING-HC finger required for RBR-mediated ubiquitination.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 767992469  14 CPVCY-EKFRDLegASRTLSCGHVFCHDCLVKYLLSTRVDGQVQrTLVCP 62
Cdd:cd16628    8 CNICFlDKLGSE--CMYFKDCGHVYCKECLKEYFEVQIRDGNVT-SLNCP 54

RING finger, H2 subclass, found in synoviolin and similar proteins; Synoviolin, also known as synovial apoptosis inhibitor 1 (Syvn1), Hrd1, or Der3, is an endoplasmic reticulum (ER)-anchoring E3 ubiquitin ligase that functions as a suppressor of ER stress-induced apoptosis and plays a role in homeostasis maintenance. It also targets tumor suppressor gene p53 for proteasomal degradation, suggesting crosstalk between ER associated degradation (ERAD) and p53 mediated apoptotic pathway under ER stress. Moreover, synoviolin controls body weight and mitochondrial biogenesis through negative regulation of the thermogenic coactivator peroxisome proliferator-activated receptor coactivator (PGC)-1beta. It upregulates amyloid beta production by targeting a negative regulator of gamma-secretase, Retention in endoplasmic reticulum 1 (Rer1), for degradation. It is also involved in the degradation of endogenous immature nicastrin, and affects amyloid beta-protein generation. Moreover, synoviolin is highly expressed in rheumatoid synovial cells and may be involved in the pathogenesis of rheumatoid arthritis (RA). It functions as an anti-apoptotic factor that is responsible for the outgrowth of synovial cells during the development of RA. It promotes inositol-requiring enzyme 1 (IRE1) ubiquitination and degradation in synovial fibroblasts with collagen-induced arthritis. Furthermore, the upregulation of synoviolin may represent a protective response against neurodegeneration in Parkinson's disease (PD). In addition, synoviolin is involved in liver fibrogenesis. Synoviolin contains a C3H2C2-type RING-H2 finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 767992469  14 CPVCYEkfrDLEGASRTLSCGHVFCHDCLVKYLlstrvdgqvQRTLVCPICR 65
Cdd:cd16479    4 CIICRE---EMTVGAKKLPCGHIFHLSCLRSWL---------QRQQTCPTCR 43

RING finger, H2 subclass, found in RING finger proteins RNF126, RNF115, and similar proteins; This subfamily includes RING finger proteins RNF126, RNF115, and similar proteins. RNF126 is a Bag6-dependent E3 ubiquitin ligase that is involved in the mislocalized protein (MLP) pathway of quality control. It regulates the retrograde sorting of the cation-independent mannose 6-phosphate receptor (CI-MPR). RNF126 promotes cancer cell proliferation by targeting the tumor suppressor p21 for ubiquitin-mediated degradation, and could be a novel therapeutic target in breast and prostate cancers. It is also able to ubiquitylate cytidine deaminase (AID), a poorly soluble protein that is essential for antibody diversification. RNF115, also known as Rab7-interacting ring finger protein (Rabring 7), or zinc finger protein 364 (ZNF364), or breast cancer-associated gene 2 (BCA2), is an E3 ubiquitin-protein ligase that is an endogenous inhibitor of adenosine monophosphate-activated protein kinase (AMPK) activation; this inhibition increases the efficacy of metformin in breast cancer cells. It also functions as a cofactor in the restriction imposed by tetherin on HIV-1, and targets HIV-1 Gag for lysosomal degradation, impairing virus assembly and release, in a tetherin-independent manner. Moreover, RNF115 is a Rab7-binding protein that stimulates c-Myc degradation through mono-ubiquitination of MM-1. It also plays crucial roles as a Rab7 target protein in vesicle traffic to late endosome/lysosome and lysosome biogenesis. RNF115 and RNF126 associate with the epidermal growth factor receptor (EGFR) and promote ubiquitylation of EGFR, suggesting they play a role in the ubiquitin-dependent sorting and downregulation of membrane receptors. Both of them contain an N-terminal BCA2 Zinc-finger domain (BZF), AKT-phosphorylation sites, and a C-terminal C3H2C3-type RING-H2 finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 767992469  13 ECPVCYEKFRdLEGASRTLSCGHVFCHDCLVKYLlstrvdgqvQRTLVCPICR 65
Cdd:cd16667    1 ECAVCKEDFE-VGEEVRQLPCKHLFHPDCIVPWL---------ELHNSCPVCR 43

RING finger, HC subclass, found in tripartite motif-containing protein 38 (TRIM38) and similar proteins; TRIM38, also known as RING finger protein 15 (RNF15) or zinc finger protein RoRet, is an E3 ubiquitin-protein ligase that promotes K63- and K48-linked ubiquitination of cellular proteins and also catalyzes self-ubiquitination. It negatively regulates Tumor necrosis factor alpha (TNF-alpha)- and interleukin-1beta-triggered Nuclear factor-kappaB (NF-kappaB) activation by mediating lysosomal-dependent degradation of transforming growth factor beta (TGFbeta)-activated kinase 1 (TAK1)-binding protein (TAB)2/3, two critical components of the TAK1 kinase complex. It also inhibits TLR3/4-mediated activation of NF-kappaB and interferon regulatory factor 3 (IRF3) by mediating ubiquitin-proteasomal degradation of TNF receptor-associated factor 6 (Traf6) and NAK-associated protein 1 (Nap1), respectively. Moreover, TRIM38 negatively regulates TLR3-mediated interferon beta (IFN-beta) signaling by targeting ubiquitin-proteasomal degradation of TIR domain-containing adaptor inducing IFN-beta (TRIF). It functions as a valid target for autoantibodies in primary Sjogren's Syndrome. TRIM38 belongs the C-IV subclass of the TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, a B-box, and two coiled coil domains, as well as a B30.2/SPRY (SplA and ryanodine receptor) domain positioned C-terminal to the RBCC domain.

                         10        20        30
                 ....*....|....*....|....*....|....*.
gi 767992469  30 TLSCGHVFCHDCLVKYLLSTRVDGQVQRTLVCPICR 65
Cdd:cd16600   20 SINCGHSYCKRCIVSFLENQSQLEPGLETFSCPQCR 55

Modified RING finger, HC subclass (C3HC3D-type), found in PHD and RING finger domain-containing protein 1 (PHRF1) and similar proteins; PHRF1, also known as KIAA1542, or CTD-binding SR-like protein rA9, is a ubiquitin ligase which induces the ubiquitination of TGIF (TG-interacting factor) at lysine 130. It acts as a tumor suppressor that promotes the transforming growth factor (TGF)-beta cytostatic program through selective release of TGIF-driven promyelocytic leukemia protein (PML) inactivation. PHRF1 contains a plant homeodomain (PHD) finger and a modified C3HC3D-type RING-HC finger.

                         10        20        30
                 ....*....|....*....|....*....|....*...
gi 767992469   8 DSSGSECPVCYEKFRDLEGASRTlSCGHVFCHDCLVKY 45
Cdd:cd16635    1 DDESESCPICLNTFRDQAVGTPE-SCDHIFCLDCILEW 37

RING finger, HC subclass, found in tripartite motif-containing protein 26 (TRIM26) and similar proteins; TRIM26, also known as acid finger protein (AFP), RING finger protein 95 (RNF95), or zinc finger protein 173 (ZNF173), is an E3 ubiquitin-protein ligase that negatively regulates interferon-beta production and antiviral response through polyubiquitination and degradation of nuclear transcription factor IRF3. It functions as an important regulator for RNA virus-triggered innate immune response by bridging TBK1 to NEMO (NF-kappaB essential modulator, also known as IKKgamma) and mediating TBK1 activation. It also acts as a novel tumor suppressor of hepatocellular carcinoma by regulating cancer cell proliferation, colony forming ability, migration, and invasion. TRIM26 belongs the C-IV subclass of the TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, a B-box, and two coiled coil domains, as well as a B30.2/SPRY (SplA and ryanodine receptor) domain positioned C-terminal to the RBCC domain.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYllstRVDGQVQRTLVCPICR 65
Cdd:cd16598    7 CSICLDYLRD----PVTIDCGHNFCRSCITDY----CPISGGHERPVCPLCR 50

Modified RING finger, HC subclass (C4C4-type), found in HOIL-1-interacting protein (HOIP) and similar proteins; HOIP, also known as RING finger protein 31 (RNF31) or zinc in-between-RING-finger ubiquitin-associated domain protein, together with HOIL-1 and SHARPIN, forms the E3-ligase complex (also known as linear-ubiquitin-chain assembly complex LUBAC) that regulates NF-kappaB activity and apoptosis. It also interacts with the atypical mammalian orphan receptor DAX-1, trigger DAX-1 ubiquitination and stabilization, and participate in repressing steroidogenic gene expression. HOIP contains three Npl4 zinc fingers, a central ubiquitin-associated (UBA) domain responsible for the interaction with the N-terminal ubiquitin-like domain (UBL) of HOIL-1L, an RBR domain, and a C-terminal linear chain determining domain (LDD). The RBR domain was previously known as RING-BetweenRING-RING domain or TRIAD [two RING fingers and a DRIL (double RING finger linked)] domain. Based on current understanding of the structural biology of RBR ligases, the nomenclature of RBR has been corrected as RING-BRcat (benign-catalytic)-Rcat (required-for-catalysis) recently. The RBR (RING1-BRcat-Rcat) domain uses an auto-inhibitory mechanism to modulate ubiquitination activity, as well as a hybrid mechanism that combines aspects from both RING and HECT E3 ligase function to facilitate the ubiquitination reaction. This model corresponds to the RING domain, a C4C4-type RING finger motif whose overall folding is similar to that of the C3HC4-type RING-HC finger. It is required for RBR-mediated ubiquitination.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*..
gi 767992469  13 ECPVCYEKFrdlegaSRT-----LSCGHVFCHDCLVKYLLSTRVDGQVqRTLVCPIC 64
Cdd:cd16631    2 ECPICFNSF------PRNkmvslTSCECKICPDCFKQYFTVVIKEKHI-RDLVCPAC 51

RING finger, HC subclass, found in Caenorhabditis elegans BRCA1-associated RING domain protein 1 (CeBARD1) and similar proteins; CeBARD1, also called Ce-BRD-1, Cebrd-1, or RING-type E3 ubiquitin transferase BARD1, is a constituent of the CeBCD complex that possesses E3 ubiquitin-protein ligase activity. It plays a role in triggering cellular responses at damage sites in response to DNA damage that may be induced by ionizing radiation. It protects against chromosome non-disjunction and nuclear fragmentation during meiotic double-strand break repair to ensure sister chromatid recombination and aid chromosome stability. CeBARD1 contains a typical C3HC4-type RING-HC finger.

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                 ....*....|....*....|....*....|....*....|....*....|...
gi 767992469  13 ECPVCYEKFRDLEGASrtlSCGHVFCHDCLVKYllstrvdgqVQRTLVCPICR 65
Cdd:cd23143    3 ECVICSEPQIDTFLLS---SCGHIYCWECFTEF---------IEKRHMCPSCR 43

Protein present in Fab1, YOTB, Vac1, and EEA1; The FYVE zinc finger is named after four proteins where it was first found: Fab1, YOTB/ZK632.12, Vac1, and EEA1. The FYVE finger has been shown to bind two Zn2+ ions. The FYVE finger has eight potential zinc coordinating cysteine positions. The FYVE finger is structurally related to the PHD finger and the RING finger. Many members of this family also include two histidines in a motif R+HHC+XCG, where + represents a charged residue and X any residue. The FYVE finger functions in the membrane recruitment of cytosolic proteins by binding to phosphatidylinositol 3-phosphate (PI3P), which is prominent on endosomes. The R+HHC+XCG motif is critical for PI3P binding.

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 767992469     7 KDSSGSECPVCYEKFRDLEGASRTLSCGHVFCHDCLVKYLLSTRvDGQVQRTLVCPIC 64
Cdd:smart00064   6 PDEEVSNCMGCGKEFNLTKRRHHCRNCGRIFCSKCSSKKAPLPK-LGIERPVRVCDDC 62

RING finger, HC subclass, found in radiation sensitivity protein 5 (RAD5) and similar proteins; RAD5, also known as revertibility protein 2 (REV2), or DNA repair protein RAD5, is a probable helicase, and a member of the UBC2/RAD6 epistasis group. It functions with the DNA repair protein RAD18 in error-free postreplication DNA repair. It is involved in the maintenance of wild-type rates of instability of simple repetitive sequences such as poly(GT) repeats. It may also be involved in maintaining a balance which acts in favor of error-prone non-homologous joining during DNA double-strand breaks repairs. It recruits the UBC13-MMS2 dimer to chromatin for DNA repair. RAD5 contains a typical C3HC4-type RING-HC finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 767992469  12 SECPVCYEKFRDLEGASRTlSCGHVFCHDCLVKYllstrVDGQVQRTL--VCPICR 65
Cdd:cd23131    4 VECSICTQEPIEVGEVVFT-ECGHSFCEDCLLEY-----IEFQNKKKLdlKCPNCR 53

RING finger, HC subclass, found in Arabidopsis thaliana protein CHROMATIN REMODELING 27 (CHR27) and similar proteins; CHR27, also called protein SNF2-RING-HELICASE-LIKE 1, is a probable helicase-like transcription factor involved in transcriptional gene silencing. It associates with SUVR2 and contributes to transcriptional gene silencing at RNA-directed DNA methylation (RdDM) target loci but also at RdDM-independent target loci. It may be involved in nucleosome positioning to form ordered nucleosome arrays on chromatin. It associates with SUVR2 and functions redundantly with FRG2. It is required for the efficient methylation of a broad range of RdDM target loci. CHR27 contains a typical C3HC4-type RING-HC finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|
gi 767992469  16 VCYEKFRDLEGASRTLsCGHVFCHDCLVKYLLSTRVDGQVQRtlvCPICR 65
Cdd:cd23142    2 ICPICNDPPEDAVVTL-CGHVFCCECVFQYLSSDRTCRQFNH---CPLCR 47

RING finger, HC subclass, found in RING finger protein 39 (RNF39) and similar proteins; RNF39, also called protein HZFw, may play a role in prolonged long term-potentiation (LTP) maintenance. It is involved in the etiology of Behcet's disease (BD). It may also be involved in HIV-1 replication. RNF39 acts as an E3 ubiquitin ligase that inhibits retinoic acid-inducible gene-I (RIG-I)-like receptor (RLR) pathways by mediating K48-linked ubiquitination and proteasomal degradation of DDX3X (DEAD-box RNA helicase 3, X-linked). RNF39 contains a typical C3HC4-type RING-HC finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYLLSTRVDGQVQRTLVCPICR 65
Cdd:cd16592    7 CPICLGYFKD----PVILDCEHSFCRACIARHWGQEAMEGNGAEGVFCPQCG 54

RING finger, HC subclass, found in RING finger protein 138 (RNF138) and similar proteins; RNF138, also known as Nemo-like kinase-associated RING finger protein (NARF) or NLK-associated RING finger protein, is an E3 ubiquitin-protein ligase that plays an important role in glioma cell proliferation, apoptosis, and cell cycle. It specifically cooperates with the E2 conjugating enzyme E2-25K (Hip-2/UbcH1), regulates the ubiquitylation and degradation of T cell factor/lymphoid enhancer factor (TCF/LEF), and further suppresses Wnt-beta-catenin signaling. RNF138, together with three closely related proteins: RNF114, RNF125 and RNF166, forms a novel family of ubiquitin ligases with a C3HC4-type RING-HC finger, a C2HC-, and two C2H2-type zinc fingers, as well as a ubiquitin interacting motif (UIM).

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 767992469  13 ECPVCYEKFRDlegASRTLSCGHVFCHDCLVkyllsTRVDGQVQRtlvCPICRYVTFLSKK 73
Cdd:cd16544    4 TCPVCQEVLKD---PVELPPCRHIFCKACIL-----LALRSSGAR---CPLCRGPVGKTER 53

RING finger, H2 subclass, found in RING finger protein 25 (RNF25) and similar proteins; RNF25, also known as AO7, is a putative E3 ubiquitin-protein ligase that was initially identified as an interacting protein of the E2 ubiquitin-conjugating enzyme, Ubc5B. It is ubiquitously expressed in various tissues and predominantly localized in the nucleus. RNF25 activates the nuclear factor (NF)-kappaB-dependent gene expression upon stimulation with Interleukin-1 beta (IL-1beta), or tumor necrosis factor (TNF), or overexpression of NF-kappaB-inducing kinase. It interacts with the p65 transactivation domain (TAD) and modulates its transcriptional activity. RNF25 contains an N-terminal RWD domain, a C3H2C3-type RING-H2 finger, and a C-terminal Pro-rich region. Both the RING-H2 finger and the C-terminal regions of RNF25 are necessary for transcriptional activation.

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 767992469  13 ECPVCYEKFRDLEGASRTlSCGHVF-CHdCLVKYLLSTR----------------VDGQVQRTLVCPICR 65
Cdd:cd16470    4 QCVICLYGFQEGDAFTKT-PCYHYFhSH-CLARYIQHMEenlkeeqeeqeerpraQTEQEQFQVLCPVCR 71

RING finger, HC subclass, found in tripartite motif-containing proteins TRIM60, TRIM61, TRIM75 and similar proteins; TRIM60, also known as RING finger protein 129 (RNF129) or RING finger protein 33 (RNF33), is a cytoplasmic protein expressed in the testis. It may play an important role in the spermatogenesis process, the development of the preimplantation embryo, and in testicular functions. RNF33 interacts with the cytoplasmic kinesin motor proteins KIF3A and KIF3B suggesting possible contribution to cargo movement along the microtubule in the expressed sites. It is also involved in spermatogenesis in Sertoli cells under the regulation of nuclear factor-kappaB (NF-kappaB). TRIM75 mainly localizes within spindles, suggesting it may function in spindle organization and thereby affect meiosis. Both TRIM60 and TRIM75 belong the C-IV subclass of the TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, a B2-box, and two coiled coil domains, as well as a PRY domain and a B30.2/SPRY (SplA and ryanodine receptor) domain positioned C-terminal to the RBCC domain. In contrast, TRIM61 belongs to the C-V subclass of the TRIM family that contains RBCC domains only. Its biological function remains unclear.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 767992469  11 GSECPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYLLStrvdgqVQRTLVCPICRY 66
Cdd:cd16607    1 EASCPICLDYLKD----PVTINCGHNFCRSCISMSWKD------LQDTFPCPVCRF 46

RING finger, HC subclass, found in RING finger protein 8 (RNF8) and similar proteins; RNF8 is a telomere-associated E3 ubiquitin-protein ligase that plays an important role in DNA double-strand break (DSB) repair via histone ubiquitination. It is localized in the nucleus and interacts with class III E2s (UBE2E2, UbcH6, and UBE2E3), but not with other E2s (UbcH5, UbcH7, UbcH10, hCdc34, and hBendless). It recruits UBC13 for lysine 63-based self polyubiquitylation. Its deficiency causes neuronal pathology and cognitive decline, and its loss results in neuron degeneration. RNF8, together with RNF168, catalyzes a series of ubiquitylation events on substrates such as H2A and H2AX, with the H2AK13/15 ubiquitylation being particularly important for recruitment of repair factors p53-binding protein 1 (53BP1) or the RAP80-BRCA1 complex to sites of DSBs. RNF8 mediates the ubiquitination of gammaH2AX, and recruits 53BP1 and BRCA1 to DNA damage sites which promotes DNA damage response (DDR) and inhibits chromosomal instability. Moreover, RNF8 interacts with retinoid X receptor alpha (RXR alpha) and enhances its transcription-stimulating activity. It also regulates the rate of exit from mitosis and cytokinesis. RNF8 contains an N-terminal forkhead-associated (FHA) domain and a C-terminal C3HC4-type RING-HC finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 767992469  13 ECPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYLlstrvdgqvQRTLVCPICR 65
Cdd:cd16535    3 QCSICSELFIE----AVTLNCSHSFCSYCITEWM---------KRKKECPICR 42

RING finger, H2 subclass, found in RING finger proteins RNF24, RNF122, and similar proteins; This subfamily includes RNF24, RNF122, and similar proteins. RNF24 is an intrinsic membrane protein localized in the Golgi apparatus. It specifically interacts with the ankyrin-repeats domains (ARDs) of TRPC1, -3, -4, -5, -6, and -7, and affects TRPC intracellular trafficking without affecting their activity. RNF122 is a RING finger protein associated with HEK 293T cell viability. It is localized to the endoplasmic reticulum (ER) and the Golgi apparatus, and overexpressed in anaplastic thyroid cancer cells. RNF122 functions as an E3 ubiquitin ligase that can ubiquitinate itself and undergo degradation through its RING finger in a proteasome-dependent manner. Both RNF24 and RNF122 contain an N-terminal transmembrane domain and a C-terminal C3H2C3-type RING-H2 finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 767992469  14 CPVCYEKFRDLEGASrTLSCGHVFCHDCLVKYLlstrvdgQVQRTlvCPIC 64
Cdd:cd16469    3 CAVCLEEFKLKEELG-VCPCGHAFHTKCLKKWL-------EVRNS--CPIC 43

RING finger, HC subclass, found in constitutive photomorphogenesis protein 1 (COP1) and similar proteins; COP1, also known as RING finger and WD repeat domain protein 2 (RFWD2) or RING finger protein 200 (RNF200), is a central regulator of photomorphogenic development in plants, which targets key transcription factors for proteasome-dependent degradation. It is localized predominantly in the nucleus, but may also be present in the cytosol. Mammalian COP1 functions as an E3 ubiquitin-protein ligase that interacts with Jun transcription factors and modulates their transcriptional activity. It also interacts with and negatively regulates the tumor-suppressor protein p53. Moreover, COP1 associates with COP9 signalosome subunit 6 (CSN6), and is involved in 14-3-3sigma ubiquitin-mediated degradation. The CSN6-COP1 link enhances ubiquitin-mediated degradation of p27(Kip1), a critical CDK inhibitor involved in cell cycle regulation, to promote cancer cell growth. Furthermore, COP1 functions as the negative regulator of ETV1 and influences prognosis in triple-negative breast cancer. COP1 contains an N-terminal extension, a C3HC4-type RING-HC finger, a coiled coil domain, and seven WD40 repeats. In human COP1, a classic leucine-rich NES, and a novel bipartite NLS is bridged by the RING-HC finger.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 767992469  14 CPVCYEKFRDlegaSRTLSCGHVFCHDCLVKYLLstrvdgQVQRtlvCPICRYV 67
Cdd:cd16504    5 CPICFDIIKE----AFVTKCGHSFCYKCIVKHLE------QKNR---CPKCNFY 45

RING finger, HC subclass, found in tripartite motif-containing protein 72 (TRIM72) and similar proteins; TRIM72, also known as Mitsugumin-53 (MG53), is a muscle-specific protein that plays a central role in cell membrane repair by nucleating the assembly of the repair machinery at muscle injury sites. It is required in repair of alveolar epithelial cells under plasma membrane stress failure. It interacts with dysferlin to regulate sarcolemmal repair. Upregulation of TRIM72 develops obesity, systemic insulin resistance, dyslipidemia, and hyperglycemia, as well as induces diabetic cardiomyopathy through transcriptional activation of the peroxisome proliferation-activated receptor alpha (PPAR-alpha) signaling pathway. Compensation for the absence of AKT signaling by ERK signaling during TRIM72 overexpression leads to pathological hypertrophy. Moreover, TRIM72 functions as a novel negative feedback regulator of myogenesis by targeting insulin receptor substrate-1 (IRS-1). It is transcriptionally activated by the synergism of myogenin (MyoD) and myocyte enhancer factor 2 (MEF2). TRIM72 belongs to the C-IV subclass of the TRIM (tripartite motif) family of proteins that are defined by their N-terminal RBCC (RING, Bbox, and coiled coil) domains, including three consecutive zinc-binding domains, a C3HC4-type RING-HC finger, Bbox1 and Bbox2, and a coiled coil region, as well as a B30.2/SPRY (SplA and ryanodine receptor) domain positioned C-terminal to the RBCC domain.

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                 ....*....|....*....|....*....|....*....|....*....|....*
gi 767992469  14 CPVCYEKFRdlegASRTLSCGHVFCHDCLVKylLSTRVDGQvqrTLVCPICRYVT 68
Cdd:cd16612    7 CPLCLKLFQ----SPVTTECGHTFCQDCLSR--VPKEEDGG---STSCPTCQAPT 52

RING finger, HC subclass, found in E3 ubiquitin-protein ligase Deltex3 (DTX3), Deltex-3-like (DTX3L) and similar proteins; This subfamily contains Deltex3 (DTX3) and Deltex-3-like (DTX3L), both of which are E3 ubiquitin-protein ligases belonging to the Deltex (DTX) family. DTX3, also known as RING finger protein 154 (RNF154), has a biological function that remains unclear. DTX3L, also known as B-lymphoma- and BAL-associated protein (BBAP) or Rhysin-2 (Rhysin2), regulates endosomal sorting of the G protein-coupled receptor CXCR4 from endosomes to lysosomes. It also regulates subcellular localization of its partner protein, B aggressive lymphoma (BAL), by a dynamic nucleocytoplasmic trafficking mechanism. In contrast to other DTXs, both DTX3 and DTX3L contain a C3HC4-type RING-HC finger, and a previously unidentified C-terminal domain. DTX3L can associate with DTX1 through its unique N termini and further enhance self-ubiquitination.

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gi 767992469  12 SECPVCYEKFRDlegaSRTL-SCGHVFCHDCLVKYLlstrvdgqvQRTLVCPICRYV 67
Cdd:cd16506    1 DTCPICLDEIQN----KKTLeKCKHSFCEDCIDRAL---------QVKPVCPVCGVV 44

RING finger, HC subclass, found in SH3 domain-containing RING finger protein 1 (SH3RF1) and similar proteins; SH3RF1, also known as plenty of SH3s (POSH), RING finger protein 142 (RNF142), or SH3 multiple domains protein 2 (SH3MD2), is a trans-Golgi network-associated pro-apoptotic scaffold protein with E3 ubiquitin-protein ligase activity. It also plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and c-Jun N-terminal kinase (JNK) mediated apoptosis, linking Rac1 to downstream components. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. Moreover, SH3RF1 assembles an inhibitory complex with the actomyosin regulatory protein Shroom3, which links to the actin-myosin network to regulate neuronal process outgrowth. It also forms a complex with apoptosis-linked gene-2 (ALG-2) and ALG-2-interacting protein (ALIX/AIP1) in a calcium-dependent manner to play a role in the regulation of the JNK pathway. Furthermore, direct interaction of SH3RF1 and another molecular scaffold JNK-interacting protein (JIP) is required for apoptotic activation of JNKs. Interaction of SH3RF1 and E3 ubiquitin-protein isopeptide ligases, Siah proteins, further promotes JNK activation and apoptosis. In addition, SH3RF1 binds to and degrades TAK1, a crucial activator of both the JNK and the Relish signaling pathways. SH3RF1 contains an N-terminal C3HC4-type RING-HC finger responsible for the E3 ligase activity and four Src Homology 3 (SH3) domains, which are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs.

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gi 767992469  13 ECPVCYEKfrdLEGASRTLSCGHVFCHDCLVKYLLStrvdgqvQRTLVCPICR 65
Cdd:cd16748    4 ECPVCLER---LDATAKVLPCQHTFCRRCLLGIVGS-------RSELRCPECR 46

RING finger, HC subclass, found in RING finger protein 208 (RNF208) and similar proteins; RNF208 is an E3 ubiquitin-protein ligase whose activity can be modulated by S-nitrosylation. It contains a C3HC4-type RING-HC finger.

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gi 767992469  13 ECPVCYEKFRDLEGASRTLSCGHVFCHDCLvKYLLSTRVDGQvqrTLVCPICRYVTFL 70
Cdd:cd16559    3 LCPTCGHSYNFTNKRPRILSCLHSVCEECL-QILYESCPKYK---FISCPTCKRETVL 56