RNA recognition motif (RRM) found in vertebrate fused in Ewing's sarcoma protein (FUS), TATA-binding protein-associated factor 15 (TAF15) and similar proteins; This subgroup corresponds to the RRM of FUS and TAF15. FUS (TLS or Pigpen or hnRNP P2), also termed 75 kDa DNA-pairing protein (POMp75), or oncoprotein TLS (Translocated in liposarcoma), is a member of the FET (previously TET) (FUS/TLS, EWS, TAF15) family of RNA- and DNA-binding proteins whose expression is altered in cancer. It is a multi-functional protein and has been implicated in pre-mRNA splicing, chromosome stability, cell spreading, and transcription. FUS was originally identified in human myxoid and round cell liposarcomas as an oncogenic fusion with the stress-induced DNA-binding transcription factor CHOP (CCAAT enhancer-binding homologous protein) and later as hnRNP P2, a component of hnRNP H complex assembled on pre-mRNA. It can form ternary complexes with hnRNP A1 and hnRNP C1/C2. Additional research indicates that FUS binds preferentially to GGUG-containing RNAs. In the presence of Mg2+, it can bind both single- and double-stranded DNA (ssDNA/dsDNA) and promote ATP-independent annealing of complementary ssDNA and D-loop formation in superhelical dsDNA. FUS has been shown to be recruited by single stranded noncoding RNAs to the regulatory regions of target genes such as cyclin D1, where it represses transcription by disrupting complex formation. TAF15 (TAFII68), also termed TATA-binding protein-associated factor 2N (TAF2N), or RNA-binding protein 56 (RBP56), originally identified as a TAF in the general transcription initiation TFIID complex, is a novel RNA/ssDNA-binding protein with homology to the proto-oncoproteins FUS and EWS (also termed EWSR1), belonging to the FET family as well. TAF15 likely functions in RNA polymerase II (RNAP II) transcription by interacting with TFIID and subunits of RNAP II itself. TAF15 is also associated with U1 snRNA, chromatin and RNA, in a complex distinct from the Sm-containing U1 snRNP that functions in splicing. Like other members in the FET family, both FUS and TAF15 contain an N-terminal Ser, Gly, Gln and Tyr-rich region composed of multiple copies of a degenerate hexapeptide repeat motif. The C-terminal region consists of a conserved nuclear import and retention signal (C-NLS), a C2/C2 zinc-finger motif, a conserved RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain), and at least 1 arginine-glycine-glycine (RGG)-repeat region.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 230 DNNTIFVQGLGEGVSTDQVGEFFKQIGIIKTNKKTGKPMINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGN 309
Cdd:cd12535     1 DNNTIFVQGLGEDVTIDSVADYFKQIGIIKTNKKTGKPMINLYTDKETGKLKGEATVSFDDPPSAKAAIDWFDGKEFSGN 80

                  ....*.
gi 2047705750 310 IIKVSF 315
Cdd:cd12535    81 PIKVSF 86

serine-rich protein; This serine-rich protein belongs to a family with large size (over 1000 amino acids), which a highly serine-rich central region that averages over 300 aa in length. Species encoding members of this family of proteins tend to be anaerobic bacteria, including Gram-positive bacteria of the human gut microbiome and Chloroflexi from marine sediments.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750    4 SGSYSQSGGEQQSYSSYGNQG---------------------------SQGYGQTQQSYSGYGQTTDSSYGQNyGGYSG- 55
Cdd:NF033849   318 STTDSSSHSQSSSYNVSSGTGvssshsdgtsqstsishsesssestgtSVGHSTSSSVSSSESSSRSSSSGVS-GGFSGg 396

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750   56 ----------YGQNQSGySQSYGSyeNQKQSSYGQQSYNNQGQQNTESSGGQGGRAPSYGQSD-YGQQDSYDQQSGYDQH 124
Cdd:NF033849   397 iagggvtsegLGASQGG-SEGWGS--GDSVQSVSQSYGSSSSTGTSSGHSDSSSHSTSSGQADsVSQGTSWSEGTGTSQG 473

                          170       180       190
                   ....*....|....*....|....*....|..
gi 2047705750  125 QGSYDEQSNYQQHdSYNQNQQSYHPQRENYSH 156
Cdd:NF033849   474 QSVGTSESWSTSQ-SETDSVGDSTGTSESVSQ 504

RNA recognition motif (RRM) found in vertebrate fused in Ewing's sarcoma protein (FUS), TATA-binding protein-associated factor 15 (TAF15) and similar proteins; This subgroup corresponds to the RRM of FUS and TAF15. FUS (TLS or Pigpen or hnRNP P2), also termed 75 kDa DNA-pairing protein (POMp75), or oncoprotein TLS (Translocated in liposarcoma), is a member of the FET (previously TET) (FUS/TLS, EWS, TAF15) family of RNA- and DNA-binding proteins whose expression is altered in cancer. It is a multi-functional protein and has been implicated in pre-mRNA splicing, chromosome stability, cell spreading, and transcription. FUS was originally identified in human myxoid and round cell liposarcomas as an oncogenic fusion with the stress-induced DNA-binding transcription factor CHOP (CCAAT enhancer-binding homologous protein) and later as hnRNP P2, a component of hnRNP H complex assembled on pre-mRNA. It can form ternary complexes with hnRNP A1 and hnRNP C1/C2. Additional research indicates that FUS binds preferentially to GGUG-containing RNAs. In the presence of Mg2+, it can bind both single- and double-stranded DNA (ssDNA/dsDNA) and promote ATP-independent annealing of complementary ssDNA and D-loop formation in superhelical dsDNA. FUS has been shown to be recruited by single stranded noncoding RNAs to the regulatory regions of target genes such as cyclin D1, where it represses transcription by disrupting complex formation. TAF15 (TAFII68), also termed TATA-binding protein-associated factor 2N (TAF2N), or RNA-binding protein 56 (RBP56), originally identified as a TAF in the general transcription initiation TFIID complex, is a novel RNA/ssDNA-binding protein with homology to the proto-oncoproteins FUS and EWS (also termed EWSR1), belonging to the FET family as well. TAF15 likely functions in RNA polymerase II (RNAP II) transcription by interacting with TFIID and subunits of RNAP II itself. TAF15 is also associated with U1 snRNA, chromatin and RNA, in a complex distinct from the Sm-containing U1 snRNP that functions in splicing. Like other members in the FET family, both FUS and TAF15 contain an N-terminal Ser, Gly, Gln and Tyr-rich region composed of multiple copies of a degenerate hexapeptide repeat motif. The C-terminal region consists of a conserved nuclear import and retention signal (C-NLS), a C2/C2 zinc-finger motif, a conserved RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain), and at least 1 arginine-glycine-glycine (RGG)-repeat region.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 230 DNNTIFVQGLGEGVSTDQVGEFFKQIGIIKTNKKTGKPMINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGN 309
Cdd:cd12535     1 DNNTIFVQGLGEDVTIDSVADYFKQIGIIKTNKKTGKPMINLYTDKETGKLKGEATVSFDDPPSAKAAIDWFDGKEFSGN 80

                  ....*.
gi 2047705750 310 IIKVSF 315
Cdd:cd12535    81 PIKVSF 86

RNA recognition motif (RRM) domain [Translation, ribosomal structure and biogenesis];

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 231 NNTIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNI 310
Cdd:COG0724     1 SMKIYVGNLPYSVTEEDLRELFSEYGEVTS--------VKLITDRETGRSRGFGFVEMPDDEEAQAAIEALNGAELMGRT 72

                          90
                  ....*....|.
gi 2047705750 311 IKVSFATRRPE 321
Cdd:COG0724    73 LKVNEARPREE 83

Zn-finger in Ran binding protein and others;

                          10        20        30
                  ....*....|....*....|....*....|.
gi 2047705750 352 KNGDWVCPnpSCGNMNFARRNSCNQCNEPRP 382
Cdd:pfam00641   1 REGDWDCS--KCLVQNFATSTKCVACQAPKP 29

U2 snRNP auxilliary factor, large subunit, splicing factor; These splicing factors consist of an N-terminal arginine-rich low complexity domain followed by three tandem RNA recognition motifs (pfam00076). The well-characterized members of this family are auxilliary components of the U2 small nuclear ribonuclearprotein splicing factor (U2AF). These proteins are closely related to the CC1-like subfamily of splicing factors (TIGR01622). Members of this subfamily are found in plants, metazoa and fungi.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 215 DYGPRPDADSE------SDNSDN--------------NTIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTD 274
Cdd:TIGR01642 259 DYIPVPQITPEvsqknpDDNAKNveklvnsttvldskDRIYIGNLPLYLGEDQIKELLESFGDLKA--------FNLIKD 330

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|...
gi 2047705750 275 KDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKVSFAT 317
Cdd:TIGR01642 331 IATGLSKGYAFCEYKDPSVTDVAIAALNGKDTGDNKLHVQRAC 373

serine-rich protein; This serine-rich protein belongs to a family with large size (over 1000 amino acids), which a highly serine-rich central region that averages over 300 aa in length. Species encoding members of this family of proteins tend to be anaerobic bacteria, including Gram-positive bacteria of the human gut microbiome and Chloroflexi from marine sediments.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750    4 SGSYSQSGGEQQSYSSYGNQG---------------------------SQGYGQTQQSYSGYGQTTDSSYGQNyGGYSG- 55
Cdd:NF033849   318 STTDSSSHSQSSSYNVSSGTGvssshsdgtsqstsishsesssestgtSVGHSTSSSVSSSESSSRSSSSGVS-GGFSGg 396

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750   56 ----------YGQNQSGySQSYGSyeNQKQSSYGQQSYNNQGQQNTESSGGQGGRAPSYGQSD-YGQQDSYDQQSGYDQH 124
Cdd:NF033849   397 iagggvtsegLGASQGG-SEGWGS--GDSVQSVSQSYGSSSSTGTSSGHSDSSSHSTSSGQADsVSQGTSWSEGTGTSQG 473

                          170       180       190
                   ....*....|....*....|....*....|..
gi 2047705750  125 QGSYDEQSNYQQHdSYNQNQQSYHPQRENYSH 156
Cdd:NF033849   474 QSVGTSESWSTSQ-SETDSVGDSTGTSESVSQ 504

serine-rich protein; This serine-rich protein belongs to a family with large size (over 1000 amino acids), which a highly serine-rich central region that averages over 300 aa in length. Species encoding members of this family of proteins tend to be anaerobic bacteria, including Gram-positive bacteria of the human gut microbiome and Chloroflexi from marine sediments.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750    2 SDSGSYSQSG----GEQQSYSSYGNQGSQGYGQTqqsySGYGQTTDSSYGQNYGGYSGYGQNQSgYSQSYGsyeNQKQSS 77
Cdd:NF033849   404 SEGLGASQGGsegwGSGDSVQSVSQSYGSSSSTG----TSSGHSDSSSHSTSSGQADSVSQGTS-WSEGTG---TSQGQS 475

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|....
gi 2047705750   78 YGQQSYNNQGQQNTESSGGQGGRAPSYGQSD-YGQQDSYDQQSG 120
Cdd:NF033849   476 VGTSESWSTSQSETDSVGDSTGTSESVSQGDgRSTGRSESQGTS 519

RNA recognition motif (RRM) found in vertebrate fused in Ewing's sarcoma protein (FUS), TATA-binding protein-associated factor 15 (TAF15) and similar proteins; This subgroup corresponds to the RRM of FUS and TAF15. FUS (TLS or Pigpen or hnRNP P2), also termed 75 kDa DNA-pairing protein (POMp75), or oncoprotein TLS (Translocated in liposarcoma), is a member of the FET (previously TET) (FUS/TLS, EWS, TAF15) family of RNA- and DNA-binding proteins whose expression is altered in cancer. It is a multi-functional protein and has been implicated in pre-mRNA splicing, chromosome stability, cell spreading, and transcription. FUS was originally identified in human myxoid and round cell liposarcomas as an oncogenic fusion with the stress-induced DNA-binding transcription factor CHOP (CCAAT enhancer-binding homologous protein) and later as hnRNP P2, a component of hnRNP H complex assembled on pre-mRNA. It can form ternary complexes with hnRNP A1 and hnRNP C1/C2. Additional research indicates that FUS binds preferentially to GGUG-containing RNAs. In the presence of Mg2+, it can bind both single- and double-stranded DNA (ssDNA/dsDNA) and promote ATP-independent annealing of complementary ssDNA and D-loop formation in superhelical dsDNA. FUS has been shown to be recruited by single stranded noncoding RNAs to the regulatory regions of target genes such as cyclin D1, where it represses transcription by disrupting complex formation. TAF15 (TAFII68), also termed TATA-binding protein-associated factor 2N (TAF2N), or RNA-binding protein 56 (RBP56), originally identified as a TAF in the general transcription initiation TFIID complex, is a novel RNA/ssDNA-binding protein with homology to the proto-oncoproteins FUS and EWS (also termed EWSR1), belonging to the FET family as well. TAF15 likely functions in RNA polymerase II (RNAP II) transcription by interacting with TFIID and subunits of RNAP II itself. TAF15 is also associated with U1 snRNA, chromatin and RNA, in a complex distinct from the Sm-containing U1 snRNP that functions in splicing. Like other members in the FET family, both FUS and TAF15 contain an N-terminal Ser, Gly, Gln and Tyr-rich region composed of multiple copies of a degenerate hexapeptide repeat motif. The C-terminal region consists of a conserved nuclear import and retention signal (C-NLS), a C2/C2 zinc-finger motif, a conserved RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain), and at least 1 arginine-glycine-glycine (RGG)-repeat region.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 230 DNNTIFVQGLGEGVSTDQVGEFFKQIGIIKTNKKTGKPMINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGN 309
Cdd:cd12535     1 DNNTIFVQGLGEDVTIDSVADYFKQIGIIKTNKKTGKPMINLYTDKETGKLKGEATVSFDDPPSAKAAIDWFDGKEFSGN 80

                  ....*.
gi 2047705750 310 IIKVSF 315
Cdd:cd12535    81 PIKVSF 86

RNA recognition motif (RRM) found in Drosophila melanogaster RNA-binding protein cabeza and similar proteins; This subgroup corresponds to the RRM in cabeza, also termed P19, or sarcoma-associated RNA-binding fly homolog (SARFH). It is a putative homolog of human RNA-binding proteins FUS (also termed TLS or Pigpen or hnRNP P2), EWS (also termed EWSR1), TAF15 (also termed hTAFII68 or TAF2N or RPB56), and belongs to the of the FET (previously TET) (FUS/TLS, EWS, TAF15) family of RNA- and DNA-binding proteins whose expression is altered in cancer. It is a nuclear RNA binding protein that may play an important role in the regulation of RNA metabolism during fly development. Cabeza contains one RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain).

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIKTNKKTGKPMINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKV 313
Cdd:cd12534     1 VFVSNLPPNTTEQDLAEHFGSIGIIKIDKKTGKPKIWLYKDKDTGEPKGEATVTYDDPHAASAAIEWFNNKDFMGNTIKV 80

                  ...
gi 2047705750 314 SFA 316
Cdd:cd12534    81 SLA 83

RNA recognition motif;

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750  233 TIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIK 312
Cdd:smart00360   1 TLFVGNLPPDTTEEELRELFSKFGKVES--------VRLVRDKETGKSKGFAFVEFESEEDAEKALEALNGKELDGRPLK 72

                   .
gi 2047705750  313 V 313
Cdd:smart00360  73 V 73

RNA recognition motif (RRM) superfamily; RRM, also known as RBD (RNA binding domain) or RNP (ribonucleoprotein domain), is a highly abundant domain in eukaryotes found in proteins involved in post-transcriptional gene expression processes including mRNA and rRNA processing, RNA export, and RNA stability. This domain is 90 amino acids in length and consists of a four-stranded beta-sheet packed against two alpha-helices. RRM usually interacts with ssRNA, but is also known to interact with ssDNA as well as proteins. RRM binds a variable number of nucleotides, ranging from two to eight. The active site includes three aromatic side-chains located within the conserved RNP1 and RNP2 motifs of the domain. The RRM domain is found in a variety heterogeneous nuclear ribonucleoproteins (hnRNPs), proteins implicated in regulation of alternative splicing, and protein components of small nuclear ribonucleoproteins (snRNPs).

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDtGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKV 313
Cdd:cd00590     1 LFVGNLPPDTTEEDLRELFSKFGEVVS--------VRIVRDRD-GKSKGFAFVEFESPEDAEKALEALNGTELGGRPLKV 71

                  .
gi 2047705750 314 S 314
Cdd:cd00590    72 S 72

RNA recognition motif. (a.k.a. RRM, RBD, or RNP domain); The RRM motif is probably diagnostic of an RNA binding protein. RRMs are found in a variety of RNA binding proteins, including various hnRNP proteins, proteins implicated in regulation of alternative splicing, and protein components of snRNPs. The motif also appears in a few single stranded DNA binding proteins. The RRM structure consists of four strands and two helices arranged in an alpha/beta sandwich, with a third helix present during RNA binding in some cases The C-terminal beta strand (4th strand) and final helix are hard to align and have been omitted in the SEED alignment The LA proteins have an N terminal rrm which is included in the seed. There is a second region towards the C terminus that has some features characteriztic of a rrm but does not appear to have the important structural core of a rrm. The LA proteins are one of the main autoantigens in Systemic lupus erythematosus (SLE), an autoimmune disease.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDkDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIK 312
Cdd:pfam00076   1 LFVGNLPPDTTEEDLKDLFSKFGPIKS--------IRLVRD-ETGRSKGFAFVEFEDEEDAEKAIEALNGKELGGRELK 70

RNA recognition motif 1 (RRM1) found in yeast nucleolar protein 4 (Nop4p) and similar proteins; This subgroup corresponds to the RRM1 of Nop4p (also known as Nop77p), encoded by YPL043W from Saccharomyces cerevisiae. It is an essential nucleolar protein involved in processing and maturation of 27S pre-rRNA and biogenesis of 60S ribosomal subunits. Nop4p has four RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains).

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 233 TIFVQGLGEGVSTDQVGEFFKQIGIIKtnkktgKPMInlYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIK 312
Cdd:cd12674     2 TLFVRNLPFDVTLESLTDFFSDIGPVK------HAVV--VTDPETKKSRGYGFVSFSTHDDAEEALAKLKNRKLSGHILK 73

                  ....*..
gi 2047705750 313 VSFATRR 319
Cdd:cd12674    74 LDFAKPR 80

RNA recognition motif (RRM) found in RNA-binding protein RBM8A, RBM8B nd similar proteins; This subfamily corresponds to the RRM of RBM8, also termed binder of OVCA1-1 (BOV-1), or RNA-binding protein Y14, which is one of the components of the exon-exon junction complex (EJC). It has two isoforms, RBM8A and RBM8B, both of which are identical except that RBM8B is 16 amino acids shorter at its N-terminus. RBM8, together with other EJC components (such as Magoh, Aly/REF, RNPS1, Srm160, and Upf3), plays critical roles in postsplicing processing, including nuclear export and cytoplasmic localization of the mRNA, and the nonsense-mediated mRNA decay (NMD) surveillance process. RBM8 binds to mRNA 20-24 nucleotides upstream of a spliced exon-exon junction. It is also involved in spliced mRNA nuclear export, and the process of nonsense-mediated decay of mRNAs with premature stop codons. RBM8 forms a specific heterodimer complex with the EJC protein Magoh which then associates with Aly/REF, RNPS1, DEK, and SRm160 on the spliced mRNA, and inhibits ATP turnover by eIF4AIII, thereby trapping the EJC core onto RNA. RBM8 contains an N-terminal putative bipartite nuclear localization signal, one RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain), in the central region, and a C-terminal serine-arginine rich region (SR domain) and glycine-arginine rich region (RG domain).

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKV 313
Cdd:cd12324     9 IFVTGVHEEAQEEDIHDKFAEFGEIKN--------LHLNLDRRTGFVKGYALVEYETKKEAQAAIEGLNGKELLGQTISV 80

                  ....*..
gi 2047705750 314 SFATRRP 320
Cdd:cd12324    81 DWAFVKG 87

RNA recognition motif in type II polyadenylate-binding proteins; This subfamily corresponds to the RRM of type II polyadenylate-binding proteins (PABPs), including polyadenylate-binding protein 2 (PABP-2 or PABPN1), embryonic polyadenylate-binding protein 2 (ePABP-2 or PABPN1L) and similar proteins. PABPs are highly conserved proteins that bind to the poly(A) tail present at the 3' ends of most eukaryotic mRNAs. They have been implicated in the regulation of poly(A) tail length during the polyadenylation reaction, translation initiation, mRNA stabilization by influencing the rate of deadenylation and inhibition of mRNA decapping. ePABP-2 is predominantly located in the cytoplasm and PABP-2 is located in the nucleus. In contrast to the type I PABPs containing four copies of RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains), the type II PABPs contains a single highly-conserved RRM. This subfamily also includes Saccharomyces cerevisiae RBP29 (SGN1, YIR001C) gene encoding cytoplasmic mRNA-binding protein Rbp29 that binds preferentially to poly(A). Although not essential for cell viability, Rbp29 plays a role in modulating the expression of cytoplasmic mRNA. Like other type II PABPs, Rbp29 contains one RRM only.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIktNKktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDwFDGKEFHGNIIKV 313
Cdd:cd12306     2 IYVGNVDYGTTPEELQAHFKSCGTI--NR------VTILCDKFTGQPKGFAYIEFVDKSSVENALL-LNESEFRGRQIKV 72

                  .
gi 2047705750 314 S 314
Cdd:cd12306    73 T 73

RNA recognition motif (RRM) found in cyclophilin-33 (Cyp33) and similar proteins; This subfamily corresponds to the RRM of Cyp33, also termed peptidyl-prolyl cis-trans isomerase E (PPIase E), or cyclophilin E, or rotamase E. Cyp33 is a nuclear RNA-binding cyclophilin with an N-terminal RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain), and a C-terminal PPIase domain. Cyp33 possesses RNA-binding activity and preferentially binds to polyribonucleotide polyA and polyU, but hardly to polyG and polyC. It binds specifically to mRNA, which can stimulate its PPIase activity. Moreover, Cyp33 interacts with the third plant homeodomain (PHD3) zinc finger cassette of the mixed lineage leukemia (MLL) proto-oncoprotein and a poly-A RNA sequence through its RRM domain. It further mediates downregulation of the expression of MLL target genes HOXC8, HOXA9, CDKN1B, and C-MYC, in a proline isomerase-dependent manner. Cyp33 also possesses a PPIase activity that catalyzes cis-trans isomerization of the peptide bond preceding a proline, which has been implicated in the stimulation of folding and conformational changes in folded and unfolded proteins. The PPIase activity can be inhibited by the immunosuppressive drug cyclosporin A.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKV 313
Cdd:cd12347     1 LYVGGLAEEVDEKVLHAAFIPFGDIVD--------IQIPLDYETEKHRGFAFVEFEEAEDAAAAIDNMNESELFGRTIRV 72

                  ...
gi 2047705750 314 SFA 316
Cdd:cd12347    73 NLA 75

RNA recognition motif (RRM) found in eukaryotic translation initiation factor 3 subunit G (eIF-3G) and similar proteins; This subfamily corresponds to the RRM of eIF-3G and similar proteins. eIF-3G, also termed eIF-3 subunit 4, or eIF-3-delta, or eIF3-p42, or eIF3-p44, is the RNA-binding subunit of eIF3, a large multisubunit complex that plays a central role in the initiation of translation by binding to the 40 S ribosomal subunit and promoting the binding of methionyl-tRNAi and mRNA. eIF-3G binds 18 S rRNA and beta-globin mRNA, and therefore appears to be a nonspecific RNA-binding protein. eIF-3G is one of the cytosolic targets and interacts with mature apoptosis-inducing factor (AIF). eIF-3G contains one RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain). This family also includes yeast eIF3-p33, a homolog of vertebrate eIF-3G, plays an important role in the initiation phase of protein synthesis in yeast. It binds both, mRNA and rRNA, fragments due to an RRM near its C-terminus.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 233 TIFVQGLGEGVSTDQVGEFFKQIGIIktnkktgkPMINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIK 312
Cdd:cd12408     1 TIRVTNLSEDATEEDLRELFRPFGPI--------SRVYLAKDKETGQSKGFAFVTFETREDAERAIEKLNGFGYDNLILS 72

                  ....
gi 2047705750 313 VSFA 316
Cdd:cd12408    73 VEWA 76

RNA recognition motif 2 (RRM2) found in Nicotiana sylvestris chloroplastic 33 kDa ribonucleoprotein (NsCP33) and similar proteins; The family includes NsCP33, Arabidopsis thaliana chloroplastic 31 kDa ribonucleoprotein (CP31A) and mitochondrial glycine-rich RNA-binding protein 2 (AtGR-RBP2). NsCP33 may be involved in splicing and/or processing of chloroplast RNA's. AtCP31A, also called RNA-binding protein 1/2/3 (AtRBP33), or RNA-binding protein CP31A, or RNA-binding protein RNP-T, or RNA-binding protein cp31, is required for specific RNA editing events in chloroplasts and stabilizes specific chloroplast mRNAs, as well as for normal chloroplast development under cold stress conditions by stabilizing transcripts of numerous mRNAs under these conditions. CP31A may modulate telomere replication through RNA binding domains. AtGR-RBP2, also called AtRBG2, or glycine-rich protein 2 (AtGRP2), or mitochondrial RNA-binding protein 1a (At-mRBP1a), plays a role in RNA transcription or processing during stress. It binds RNAs and DNAs sequence with a preference to single-stranded nucleic acids. AtGR-RBP2 displays strong affinity to poly(U) sequence. It exerts cold and freezing tolerance, probably by exhibiting an RNA chaperone activity during the cold and freezing adaptation process. Some members in this family contain two RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains). The model corresponds to the second RRM motif.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 233 TIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIK 312
Cdd:cd21608     1 KLYVGNLSWDTTEDDLRDLFSEFGEVES--------AKVITDRETGRSRGFGFVTFSTAEAAEAAIDALNGKELDGRSIV 72

                  ....
gi 2047705750 313 VSFA 316
Cdd:cd21608    73 VNEA 76

RNA recognition motif 2 (RRM2) found in yeast protein gar2 and similar proteins; This subfamily corresponds to the RRM2 of yeast protein gar2, a novel nucleolar protein required for 18S rRNA and 40S ribosomal subunit accumulation. It shares similar domain architecture with nucleolin from vertebrates and NSR1 from Saccharomyces cerevisiae. The highly phosphorylated N-terminal domain of gar2 is made up of highly acidic regions separated from each other by basic sequences, and contains multiple phosphorylation sites. The central domain of gar2 contains two closely adjacent N-terminal RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains). The C-terminal RGG (or GAR) domain of gar2 is rich in glycine, arginine and phenylalanine residues.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKV 313
Cdd:cd12448     1 LFVGNLPFSATQDALYEAFSQHGSIVS--------VRLPTDRETGQPKGFGYVDFSTIDSAEAAIDALGGEYIDGRPIRL 72

                  .
gi 2047705750 314 S 314
Cdd:cd12448    73 D 73

RNA recognition motif 1 (RRM1) found in Saccharomyces cerevisiae protein HRB1, G-strand-binding protein 2 (GBP2) and similar proteins; The family includes Saccharomyces cerevisiae protein HRB1 (also called protein TOM34) and GBP2, both of which are SR-like mRNA-binding proteins which shuttle from the nucleus to the cytoplasm when bound to the mature mRNA molecules. They act as quality control factors for spliced mRNAs. GBP2, also called RAP1 localization factor 6, is a single-strand telomeric DNA-binding protein that binds single-stranded telomeric sequences of the type (TG[1-3])n in vitro. It also binds to RNA. GBP2 influences the localization of RAP1 in the nuclei and plays a role in modulating telomere length. Members in this family contain three RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains). The model corresponds to the first RRM motif.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 231 NNTIFVQGLGEGVSTDQVGEFFKQIG-IIKTNKKTGKpminlytdkdtGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGN 309
Cdd:cd21605     1 ENSIFVGNLPFDCTWEDLKDHFSQVGeVIRADIVTSR-----------GRHRGMGTVEFTNKEDVDRAISKFDHTMFMGR 69

                  ....
gi 2047705750 310 IIKV 313
Cdd:cd21605    70 EIFV 73

RNA recognition motif 2 (RRM2) found in Arabidopsis thaliana phragmoplastin interacting protein 1 (PHIP1) and similar proteins; The CD corresponds to the RRM2 of PHIP1. A. thaliana PHIP1 and its homologs represent a novel class of plant-specific RNA-binding proteins that may play a unique role in the polarized mRNA transport to the vicinity of the cell plate. The family members consist of multiple functional domains, including a lysine-rich domain (KRD domain) that contains three nuclear localization motifs (KKKR/NK), two RNA recognition motifs (RRMs), and three CCHC-type zinc fingers. PHIP1 is a peripheral membrane protein and is localized at the cell plate during cytokinesis in plants. In addition to phragmoplastin, PHIP1 interacts with two Arabidopsis small GTP-binding proteins, Rop1 and Ran2. However, PHIP1 interacted only with the GTP-bound form of Rop1 but not the GDP-bound form. It also binds specifically to Ran2 mRNA.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 233 TIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDwFDGKEFHGNIIK 312
Cdd:cd12272     1 TVYIGNLAWDIDEDDLRELFAECCEITN--------VRLHTDKETGEFKGYGHVEFADEESLDAALK-LAGTKLCGRPIR 71

                  ..
gi 2047705750 313 VS 314
Cdd:cd12272    72 VD 73

RNA recognition motif 1 (RRM1) found in nucleolin-like proteins mainly from plants; This subfamily corresponds to the RRM1 of a group of plant nucleolin-like proteins, including nucleolin 1 (also termed protein nucleolin like 1) and nucleolin 2 (also termed protein nucleolin like 2, or protein parallel like 1). They play roles in the regulation of ribosome synthesis and in the growth and development of plants. Like yeast nucleolin, nucleolin-like proteins possess two RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains).

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 233 TIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDwFDGKEFHGNIIK 312
Cdd:cd12450     1 TLFVGNLSWSATQDDLENFFSDCGEVVD--------VRIAMDRDDGRSKGFGHVEFASAESAQKALE-KSGQDLGGREIR 71

                  ....*..
gi 2047705750 313 VSFATRR 319
Cdd:cd12450    72 LDLANER 78

Zinc finger domain; Zinc finger domain in Ran-binding proteins (RanBPs), and other proteins. In RanBPs, this domain binds RanGDP.

                           10        20
                   ....*....|....*....|....*..
gi 2047705750  354 GDWVCPnpSCGNMNFARRNSCNQCNEP 380
Cdd:smart00547   1 GDWECP--ACTFLNFASRSKCFACGAP 25

RNA recognition motif (RRM) found in Saccharomyces cerevisiae nucleolar protein 6 (Nop6) and similar proteins; This subfamily corresponds to the RRM of Nop6, also known as Ydl213c, a component of 90S pre-ribosomal particles in yeast S. cerevisiae. It is enriched in the nucleolus and is required for 40S ribosomal subunit biogenesis. Nop6 is a non-essential putative RNA-binding protein with two N-terminal putative nuclear localisation sequences (NLS-1 and NLS-2) and an RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain). It binds to the pre-rRNA early during transcription and plays an essential role in pre-rRNA processing.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 232 NTIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSAKAAIDwFDGKEFHGNII 311
Cdd:cd12400     1 YILFVGNLPYDTTAEDLKEHFKKAGEPPS--------VRLLTDKKTGKSKGCAFVEFDNQKALQKALK-LHHTSLGGRKI 71

                  ..
gi 2047705750 312 KV 313
Cdd:cd12400    72 NV 73

RNA recognition motif (RRM) found in eukaryotic translation initiation factor 4H (eIF-4H) and similar proteins; This subfamily corresponds to the RRM of eIF-4H, also termed Williams-Beuren syndrome chromosomal region 1 protein, which, together with elf-4B/eIF-4G, serves as the accessory protein of RNA helicase eIF-4A. eIF-4H contains a well conserved RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain). It stimulates protein synthesis by enhancing the helicase activity of eIF-4A in the initiation step of mRNA translation.

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 2047705750 269 INLYTDKDTGKPKGEATVSFDDPPSAKAAIDwFDGKEFHGNIIKVSFATRR 319
Cdd:cd12401    34 VRLVRDRETDKFKGFCYVEFEDLESLKEALE-YDGALFEDRPLRVDIAEGR 83

RNA recognition motif (RRM) found in AZoospermia (DAZ) autosomal homologs, DAZL (DAZ-like) and BOULE; This subfamily corresponds to the RRM domain of two Deleted in AZoospermia (DAZ) autosomal homologs, DAZL (DAZ-like) and BOULE. BOULE is the founder member of the family and DAZL arose from BOULE in an ancestor of vertebrates. The DAZ gene subsequently originated from a duplication transposition of the DAZL gene. Invertebrates contain a single DAZ homolog, BOULE, while vertebrates, other than catarrhine primates, possess both BOULE and DAZL genes. The catarrhine primates possess BOULE, DAZL, and DAZ genes. The family members encode closely related RNA-binding proteins that are required for fertility in numerous organisms. These proteins contain an RNA recognition motif (RRM), also known as RBD (RNA binding domain) or RNP (ribonucleoprotein domain), and a varying number of copies of a DAZ motif, believed to mediate protein-protein interactions. DAZL and BOULE contain a single copy of the DAZ motif, while DAZ proteins can contain 8-24 copies of this repeat. Although their specific biochemical functions remain to be investigated, DAZL proteins may interact with poly(A)-binding proteins (PABPs), and act as translational activators of specific mRNAs during gametogenesis.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 232 NTIFVQGLGEGVSTDQVGEFFKQIGIIKTNKktgkpMINlytDKDtGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNII 311
Cdd:cd12412     3 NRIFVGGIDWDTTEEELREFFSKFGKVKDVK-----IIK---DRA-GVSKGYGFVTFETQEDAEKIQKWGANLVFKGKKL 73

                  ....*...
gi 2047705750 312 KVSFATRR 319
Cdd:cd12412    74 NVGPAIRK 81

RNA recognition motif in negative elongation factor E (NELF-E) and similar proteins; This subfamily corresponds to the RRM of NELF-E, also termed RNA-binding protein RD. NELF-E is the RNA-binding subunit of cellular negative transcription elongation factor NELF (negative elongation factor) involved in transcriptional regulation of HIV-1 by binding to the stem of the viral transactivation-response element (TAR) RNA which is synthesized by cellular RNA polymerase II at the viral long terminal repeat. NELF is a heterotetrameric protein consisting of NELF A, B, C or the splice variant D, and E. NELF-E contains an RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain). It plays a role in the control of HIV transcription by binding to TAR RNA. In addition, NELF-E is associated with the NELF-B subunit, probably via a leucine zipper motif.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 232 NTIFVQGlgEGVSTDQVGEFFKQIGIIktnkktgkpmINLYTDKdtgkPKGEATVSFDDPPSAKAAIDWFDGKEFHGNII 311
Cdd:cd12305     5 NTVYVSG--YGITEDVLKKAFSPFGNI----------INISMEI----EKNCAFVTFEKMESADQAIAELNGTTVEGVQL 68

                  ....*..
gi 2047705750 312 KVSFATR 318
Cdd:cd12305    69 KVSIARR 75

RNA recognition motif 2 (RRM2) found in heterogeneous nuclear ribonucleoprotein A0 (hnRNP A0) and similar proteins; This subgroup corresponds to the RRM2 of hnRNP A0, a low abundance hnRNP protein that has been implicated in mRNA stability in mammalian cells. It has been identified as the substrate for MAPKAP-K2 and may be involved in the lipopolysaccharide (LPS)-induced post-transcriptional regulation of tumor necrosis factor-alpha (TNF-alpha), cyclooxygenase 2 (COX-2) and macrophage inflammatory protein 2 (MIP-2). hnRNP A0 contains two RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains), followed by a long glycine-rich region at the C-terminus.

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTDKDTGKPKGEATVSFDDPPSA-KAAI 298
Cdd:cd12579     2 LFVGGLKGDVGEGDLVEHFSQFGTVEK--------VEVIADKDTGKKRGFGFVYFEDHDSAdKAAV 59

RNA recognition motif (RRM) found in yeast RNA annealing protein YRA1 (Yra1p), yeast mRNA export protein mlo3 and similar proteins; This subfamily corresponds to the RRM of Yra1p and mlo3. Yra1p is an essential nuclear RNA-binding protein encoded by Saccharomyces cerevisiae YRA1 gene. It belongs to the evolutionarily conserved REF (RNA and export factor binding proteins) family of hnRNP-like proteins. Yra1p possesses potent RNA annealing activity and interacts with a number of proteins involved in nuclear transport and RNA processing. It binds to the mRNA export factor Mex67p/TAP and couples transcription to export in yeast. Yra1p is associated with Pse1p and Kap123p, two members of the beta-importin family, further mediating transport of Yra1p into the nucleus. In addition, the co-transcriptional loading of Yra1p is required for autoregulation. Yra1p consists of two highly conserved N- and C-terminal boxes and a central RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain). This subfamily includes RNA-annealing protein mlo3, also termed mRNA export protein mlo3, which has been identified in fission yeast as a protein that causes defects in chromosome segregation when overexpressed. It shows high sequence similarity with Yra1p.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFK-QIGIIKTnkktgkpMINLYTDKdtGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGN 309
Cdd:cd12267     3 VIVSNLPKDVTEAQIREYFVsQIGPIKR-------VLLSYNEG--GKSTGIANITFKRAGDATKAYDKFNGRLDDGN 70

RNA recognition motif (RRM) found in the Aly/REF family; This subfamily corresponds to the RRM of Aly/REF family which includes THO complex subunit 4 (THOC4, also termed Aly/REF), S6K1 Aly/REF-like target (SKAR, also termed PDIP3 or PDIP46) and similar proteins. THOC4 is an mRNA transporter protein with a well conserved RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain). It is involved in RNA transportation from the nucleus, and was initially identified as a transcription coactivator of LEF-1 and AML-1 for the TCRalpha enhancer function. In addition, THOC4 specifically binds to rhesus (RH) promoter in erythroid, and might be a novel transcription cofactor for erythroid-specific genes. SKAR shows high sequence homology with THOC4 and possesses one RRM as well. SKAR is widely expressed and localizes to the nucleus. It may be a critical player in the function of S6K1 in cell and organism growth control by binding the activated, hyperphosphorylated form of S6K1 but not S6K2. Furthermore, SKAR functions as a protein partner of the p50 subunit of DNA polymerase delta. In addition, SKAR may have particular importance in pancreatic beta cell size determination and insulin secretion.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 233 TIFVQGLGEGVSTDQVGEFFKQIGiiktnkktgkPMINLYTDKD-TGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNII 311
Cdd:cd12418     2 RVRVSNLHPDVTEEDLRELFGRVG----------PVKSVKINYDrSGRSTGTAYVVFERPEDAEKAIKQFDGVLLDGQPM 71

                  ..
gi 2047705750 312 KV 313
Cdd:cd12418    72 KV 73

U2 snRNP auxilliary factor, large subunit, splicing factor; These splicing factors consist of an N-terminal arginine-rich low complexity domain followed by three tandem RNA recognition motifs (pfam00076). The well-characterized members of this family are auxilliary components of the U2 small nuclear ribonuclearprotein splicing factor (U2AF). These proteins are closely related to the CC1-like subfamily of splicing factors (TIGR01622). Members of this subfamily are found in plants, metazoa and fungi.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 215 DYGPRPDADSE------SDNSDN--------------NTIFVQGLGEGVSTDQVGEFFKQIGIIKTnkktgkpmINLYTD 274
Cdd:TIGR01642 259 DYIPVPQITPEvsqknpDDNAKNveklvnsttvldskDRIYIGNLPLYLGEDQIKELLESFGDLKA--------FNLIKD 330

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|...
gi 2047705750 275 KDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKVSFAT 317
Cdd:TIGR01642 331 IATGLSKGYAFCEYKDPSVTDVAIAALNGKDTGDNKLHVQRAC 373

RNA recognition motif 1 (RRM1) found in the Hu proteins family; This subfamily corresponds to the RRM1 of the Hu proteins family which represents a group of RNA-binding proteins involved in diverse biological processes. Since the Hu proteins share high homology with the Drosophila embryonic lethal abnormal vision (ELAV) protein, the Hu family is sometimes referred to as the ELAV family. Drosophila ELAV is exclusively expressed in neurons and is required for the correct differentiation and survival of neurons in flies. The neuronal members of the Hu family include Hu-antigen B (HuB or ELAV-2 or Hel-N1), Hu-antigen C (HuC or ELAV-3 or PLE21), and Hu-antigen D (HuD or ELAV-4), which play important roles in neuronal differentiation, plasticity and memory. HuB is also expressed in gonads. Hu-antigen R (HuR or ELAV-1 or HuA) is the ubiquitously expressed Hu family member. It has a variety of biological functions mostly related to the regulation of cellular response to DNA damage and other types of stress. HuR has an anti-apoptotic function during early cell stress response. It binds to mRNAs and enhances the expression of several anti-apoptotic proteins, such as p21waf1, p53, and prothymosin alpha. HuR also has pro-apoptotic function by promoting apoptosis when cell death is unavoidable. Furthermore, HuR may be important in muscle differentiation, adipogenesis, suppression of inflammatory response and modulation of gene expression in response to chronic ethanol exposure and amino acid starvation. Hu proteins perform their cytoplasmic and nuclear molecular functions by coordinately regulating functionally related mRNAs. In the cytoplasm, Hu proteins recognize and bind to AU-rich RNA elements (AREs) in the 3' untranslated regions (UTRs) of certain target mRNAs, such as GAP-43, vascular epithelial growth factor (VEGF), the glucose transporter GLUT1, eotaxin and c-fos, and stabilize those ARE-containing mRNAs. They also bind and regulate the translation of some target mRNAs, such as neurofilament M, GLUT1, and p27. In the nucleus, Hu proteins function as regulators of polyadenylation and alternative splicing. Each Hu protein contains three RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains). RRM1 and RRM2 may cooperate in binding to an ARE. RRM3 may help to maintain the stability of the RNA-protein complex, and might also bind to poly(A) tails or be involved in protein-protein interactions.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 236 VQGLGEGVSTDQVGEFFKQIGIIKTNKktgkpminLYTDKDTGKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKVSF 315
Cdd:cd12650     5 VNYLPQNMTQDEIRSLFSSIGEIESCK--------LIRDKVTGQSLGYGFVNYVDPSDAEKAINTLNGLRLQNKTIKVSY 76

                  .
gi 2047705750 316 A 316
Cdd:cd12650    77 A 77

RNA recognition motif 2 in La autoantigen (La or SS-B or LARP3), La-related protein 7 (LARP7 or PIP7S) and similar proteins; This subfamily corresponds to the RRM2 of La and LARP7. La is a highly abundant nuclear phosphoprotein and well conserved in eukaryotes. It specifically binds the 3'-terminal UUU-OH motif of nascent RNA polymerase III transcripts and protects them from exonucleolytic degradation by 3' exonucleases. In addition, La can directly facilitate the translation and/or metabolism of many UUU-3' OH-lacking cellular and viral mRNAs, through binding internal RNA sequences within the untranslated regions of target mRNAs. LARP7 is an oligopyrimidine-binding protein that binds to the highly conserved 3'-terminal U-rich stretch (3' -UUU-OH) of 7SK RNA. It is a stable component of the 7SK small nuclear ribonucleoprotein (7SK snRNP), intimately associates with all the nuclear 7SK and is required for 7SK stability. LARP7 also acts as a negative transcriptional regulator of cellular and viral polymerase II genes, acting by means of the 7SK snRNP system. LARP7 plays an essential role in the inhibition of positive transcription elongation factor b (P-TEFb)-dependent transcription, which has been linked to the global control of cell growth and tumorigenesis. Both La and LARP7 contain an N-terminal La motif (LAM), followed by two RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains).

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 2047705750 231 NNTIFVQGLGEGVSTDQVGEFFKQIGIIKtnkktgkpminlYTDKDTGKPKGEatVSFDDPPSAKAAIDWFDGKE 305
Cdd:cd12292     1 GLILKITGIGPSVSRDDLKELFKQFGEVE------------YVDFTPGDDEGH--VRFKTSEAAQKARDAYTGKL 61

RNA recognition motif (RRM) found in serine/arginine-rich splicing factor 3 (SRSF3) and similar proteins; This subfamily corresponds to the RRM of two serine/arginine (SR) proteins, serine/arginine-rich splicing factor 3 (SRSF3) and serine/arginine-rich splicing factor 7 (SRSF7). SRSF3, also termed pre-mRNA-splicing factor SRp20, modulates alternative splicing by interacting with RNA cis-elements in a concentration- and cell differentiation-dependent manner. It is also involved in termination of transcription, alternative RNA polyadenylation, RNA export, and protein translation. SRSF3 is critical for cell proliferation, and tumor induction and maintenance. It can shuttle between the nucleus and cytoplasm. SRSF7, also termed splicing factor 9G8, plays a crucial role in both constitutive splicing and alternative splicing of many pre-mRNAs. Its localization and functions are tightly regulated by phosphorylation. SRSF7 is predominantly present in the nuclear and can shuttle between nucleus and cytoplasm. It cooperates with the export protein, Tap/NXF1, helps mRNA export to the cytoplasm, and enhances the expression of unspliced mRNA. Moreover, SRSF7 inhibits tau E10 inclusion through directly interacting with the proximal downstream intron of E10, a clustering region for frontotemporal dementia with Parkinsonism (FTDP) mutations. Both SRSF3 and SRSF7 contain a single N-terminal RNA recognition motif (RRM), also termed RBD (RNA binding domain) or RNP (ribonucleoprotein domain), and a C-terminal RS domain rich in serine-arginine dipeptides. The RRM domain is involved in RNA binding, and the RS domain has been implicated in protein shuttling and protein-protein interactions.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2047705750 234 IFVQGLGEGVSTDQVGEFFKQIGiiktnkktgkPMINLYTDKdtgKPKGEATVSFDDPPSAKAAIDWFDGKEFHGNIIKV 313
Cdd:cd12373     2 VYVGNLGPRVTKRELEDAFEKYG----------PLRNVWVAR---NPPGFAFVEFEDPRDAEDAVRALDGRRICGSRVRV 68