FERM domain C-lobe/F3 of the ERM family; The ERM family includes ezrin, radixin, moesin and merlin. They are composed of a N-terminal FERM (ERM) domain (also called N-ERMAD (N-terminal ERM association domain)), a coiled coil region (CRR), and a C-terminal domain CERMAD (C-terminal ERM association domain) which has an F-actin-binding site (ABD). Two actin-binding sites have been identified in the middle and N-terminal domains. Merlin is structurally similar to the ERM proteins, but instead of an actin-binding domain (ABD), it contains a C-terminal domain (CTD), just like the proteins from the 4.1 family. Activated ezrin, radixin and moesin are thought to be involved in the linking of actin filaments to CD43, CD44, ICAM1-3 cell adhesion molecules, various membrane channels and receptors, such as the Na+/H+ exchanger-3 (NHE3), cystic fibrosis transmembrane conductance regulator (CFTR), and the beta2-adrenergic receptor. The ERM proteins exist in two states, a dormant state in which the FERM domain binds to its own C-terminal tail and thereby precludes binding of some partner proteins, and an activated state, in which the FERM domain binds to one of many membrane binding proteins and the C-terminal tail binds to F-actin. The FERM domain has a cloverleaf tripart structure composed of: (1) FERM_N (A-lobe or F1); (2) FERM_M (B-lobe, or F2); and (3) FERM_C (C-lobe or F3). The C-lobe/F3 within the FERM domain of ERM is part of the PH domain family. The FERM domain is found in the cytoskeletal-associated proteins such as ezrin, moesin, radixin, 4.1R, and merlin. These proteins provide a link between the membrane and cytoskeleton and are involved in signal transduction pathways. The FERM domain is also found in protein tyrosine phosphatases (PTPs), the tyrosine kinases FAK and JAK, in addition to other proteins involved in signaling. This domain is structurally similar to the PH and PTB domains and consequently is capable of binding to both peptides and phospholipids at different sites.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 200 MYGVNYFEIKNKKGTELWLGVDALGLNIYEHDDKLTPKIGFPWSEIRNISFNDKKFVIKPIDKKAPDFVFYAPRLRINKR 279
Cdd:cd13194    1 MYGVNYFEIKNKKGTDLWLGVDALGLNIYEPDNKLTPKIGFPWSEIRNISFNDKKFVIKPIDKKAPDFVFYSPRLRINKR 80

                         90
                 ....*....|....*..
gi 157277950 280 ILALCMGNHELYMRRRK 296
Cdd:cd13194   81 ILDLCMGNHELYMRRRK 97

Ezrin/radixin/moesin family C terminal; This entry represents the C-terminal domain of the ERM family of proteins which consists of three closely-related proteins, ezrin, radixin and moesin. These proteins link actin filaments of cell surface structures to the plasma membrane, using a C-terminal F-actin binding segment and an N-terminal FERM domain (pfam00373), a common membrane binding module. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). This entry represents the C-terminal actin-binding tail domain. This entry also includes Ermin proteins, oligodendrocyte-specific proteins associated with the cytoskeleton whose C-terminal domain is similar to that in ERM family.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 157277950  507 NHRSEEERVTETQKNERVKKQLQALSSELAQARDETKKTQNDVLHAENVKAGRDKYKTLRQIRQGNTKQRIDEFEAM 583
Cdd:pfam00769   1 SLEIEEERVTYAEKNKRLQEQLKELKSELAQARDETKQTALDILHEENVRQGRDKYKTLRKIRQGNTKQRVDFFEEL 77

FERM domain C-lobe/F3 of the ERM family; The ERM family includes ezrin, radixin, moesin and merlin. They are composed of a N-terminal FERM (ERM) domain (also called N-ERMAD (N-terminal ERM association domain)), a coiled coil region (CRR), and a C-terminal domain CERMAD (C-terminal ERM association domain) which has an F-actin-binding site (ABD). Two actin-binding sites have been identified in the middle and N-terminal domains. Merlin is structurally similar to the ERM proteins, but instead of an actin-binding domain (ABD), it contains a C-terminal domain (CTD), just like the proteins from the 4.1 family. Activated ezrin, radixin and moesin are thought to be involved in the linking of actin filaments to CD43, CD44, ICAM1-3 cell adhesion molecules, various membrane channels and receptors, such as the Na+/H+ exchanger-3 (NHE3), cystic fibrosis transmembrane conductance regulator (CFTR), and the beta2-adrenergic receptor. The ERM proteins exist in two states, a dormant state in which the FERM domain binds to its own C-terminal tail and thereby precludes binding of some partner proteins, and an activated state, in which the FERM domain binds to one of many membrane binding proteins and the C-terminal tail binds to F-actin. The FERM domain has a cloverleaf tripart structure composed of: (1) FERM_N (A-lobe or F1); (2) FERM_M (B-lobe, or F2); and (3) FERM_C (C-lobe or F3). The C-lobe/F3 within the FERM domain of ERM is part of the PH domain family. The FERM domain is found in the cytoskeletal-associated proteins such as ezrin, moesin, radixin, 4.1R, and merlin. These proteins provide a link between the membrane and cytoskeleton and are involved in signal transduction pathways. The FERM domain is also found in protein tyrosine phosphatases (PTPs), the tyrosine kinases FAK and JAK, in addition to other proteins involved in signaling. This domain is structurally similar to the PH and PTB domains and consequently is capable of binding to both peptides and phospholipids at different sites.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 200 MYGVNYFEIKNKKGTELWLGVDALGLNIYEHDDKLTPKIGFPWSEIRNISFNDKKFVIKPIDKKAPDFVFYAPRLRINKR 279
Cdd:cd13194    1 MYGVNYFEIKNKKGTDLWLGVDALGLNIYEPDNKLTPKIGFPWSEIRNISFNDKKFVIKPIDKKAPDFVFYSPRLRINKR 80

                         90
                 ....*....|....*..
gi 157277950 280 ILALCMGNHELYMRRRK 296
Cdd:cd13194   81 ILDLCMGNHELYMRRRK 97

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in the ERM family proteins, Ezrin, Radixin, and Moesin; The ezrin-radixin-moesin (ERM) family includes a group of closely related cytoskeletal proteins that plays an essential role in microvilli formation, T-cell activation, and tumor metastasis through providing a regulated linkage between F-actin and membrane-associated proteins. These proteins may also function in signaling cascades that regulate the assembly of actin stress fibers. The ERM proteins consist of an N-terminal FERM domain, a coiled-coil (CC) domain and a C-terminal tail segment (C-tail) containing a well-defined actin-binding motif. They exist in two states, a dormant state in which the FERM domain binds to its own C-terminal tail and thereby precludes binding of some partner proteins, and an activated state, in which the FERM domain binds to one of many membrane binding proteins and the C-terminal tail binds to F-actin. The FERM domain is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   5 INVRVTTMDAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDVKKENPLQFKFRAKF 84
Cdd:cd17187    1 VNVRVTTMDAELEFAIQPNTTGKQLFDQVVKTIGLREIWFFGLQYVDSKGYSTWLKLNKKVLSQDVKKENPLQFKFRAKF 80

                 ...
gi 157277950  85 FPE 87
Cdd:cd17187   81 YPE 83

Ezrin/radixin/moesin family C terminal; This entry represents the C-terminal domain of the ERM family of proteins which consists of three closely-related proteins, ezrin, radixin and moesin. These proteins link actin filaments of cell surface structures to the plasma membrane, using a C-terminal F-actin binding segment and an N-terminal FERM domain (pfam00373), a common membrane binding module. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). This entry represents the C-terminal actin-binding tail domain. This entry also includes Ermin proteins, oligodendrocyte-specific proteins associated with the cytoskeleton whose C-terminal domain is similar to that in ERM family.

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 157277950  507 NHRSEEERVTETQKNERVKKQLQALSSELAQARDETKKTQNDVLHAENVKAGRDKYKTLRQIRQGNTKQRIDEFEAM 583
Cdd:pfam00769   1 SLEIEEERVTYAEKNKRLQEQLKELKSELAQARDETKQTALDILHEENVRQGRDKYKTLRKIRQGNTKQRVDFFEEL 77

Ezrin/radixin/moesin, alpha-helical domain; The ERM family consists of three closely-related proteins, ezrin, radixin and moesin. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions, and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). ERM molecules contain 3 domains, an N-terminal globular domain, an extended alpha-helical domain and a charged C-terminal domain (pfam00769). Ezrin, radixin and merlin also contain a polyproline linker region between the helical and C-terminal domains. The N-terminal domain is highly conserved and is also found in merlin, band 4.1 proteins and members of the band 4.1 superfamily, designated the FERM domain. ERM proteins crosslink actin filaments with plasma membranes. They co-localize with CD44 at actin filament plasma membrane interaction sites, associating with CD44 via their N-terminal domains and with actin filaments via their C-terminal domains. This is the alpha-helical domain, which is involved in intramolecular masking of protein-protein interaction sites, regulating the activity of this proteins.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950  347 LMERLRQIEEQTVKAQKELEEQTRKALELEQERQRAKEEAERLDRERRAAEEAKSAIAKQAADQMKNQEQLAAELAEFTA 426
Cdd:pfam20492  11 LEERLKQYEEETKKAQEELEESEETAEELEEERRQAEEEAERLEQKRQEAEEEKERLEESAEMEAEEKEQLEAELAEAQE 90

                          90       100       110
                  ....*....|....*....|....*....|
gi 157277950  427 KIALLEEAKKKKEEEATEWQHKAFAAQEDL 456
Cdd:pfam20492  91 EIARLEEEVERKEEEARRLQEELEEAREEE 120

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   307 AQAREEKHQKQLERAQ-LENEKKKREIAEKEKERIEREKEELMERLRQIEEQTVKAQKELEEQTRKALELEQERQRAKEE 385
Cdd:TIGR02168  662 TGGSAKTNSSILERRReIEELEEKIEELEEKIAELEKALAELRKELEELEEELEQLRKELEELSRQISALRKDLARLEAE 741

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   386 AERLDRERRAAEEAKSAIAKQAADQMKNQEQLAAELAEFTAKIALLEEAKKKKEEEATEWQHKAFAAQEDLEKTKEELKT 465
Cdd:TIGR02168  742 VEQLEERIAQLSKELTELEAEIEELEERLEEAEEELAEAEAEIEELEAQIEQLKEELKALREALDELRAELTLLNEEAAN 821

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   466 VMSAPPPPPPPPVIPPTENEhdEQDENSAEASAELSS-EGVMNHrSEEERVTETQKNERVKKQLQALSSELAQARDETKK 544
Cdd:TIGR02168  822 LRERLESLERRIAATERRLE--DLEEQIEELSEDIESlAAEIEE-LEELIEELESELEALLNERASLEEALALLRSELEE 898

                          250       260       270       280
                   ....*....|....*....|....*....|....*....|....*.
gi 157277950   545 TQNDVLHAEN-VKAGRDKYKTLRQI------RQGNTKQRIDEFEAM 583
Cdd:TIGR02168  899 LSEELRELESkRSELRRELEELREKlaqlelRLEGLEVRIDNLQER 944

MAEBL; Provisional

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950  294 RRKPDTIEVQQMKAQAREEKHQKQLERAQLENEKKKREIAEKEKERIEREKEELMERLRQIEEQTVKAQKELEEQTRKAL 373
Cdd:PTZ00121 1482 AKKADEAKKKAEEAKKKADEAKKAAEAKKKADEAKKAEEAKKADEAKKAEEAKKADEAKKAEEKKKADELKKAEELKKAE 1561

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950  374 ELEQERQRAKEEAERLDRERRAaEEAKSAIAKQAADQMKNQEQLAAELAEFT-----AKIALLEEAKKKKEEEATEWQHK 448
Cdd:PTZ00121 1562 EKKKAEEAKKAEEDKNMALRKA-EEAKKAEEARIEEVMKLYEEEKKMKAEEAkkaeeAKIKAEELKKAEEEKKKVEQLKK 1640

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950  449 AFAAQ----EDLEKTKEELKTVMSAPPPPPPPPVIPPTENEHDEQDE-NSAEASAELSSEGVMNHRSEEERVTETQKNER 523
Cdd:PTZ00121 1641 KEAEEkkkaEELKKAEEENKIKAAEEAKKAEEDKKKAEEAKKAEEDEkKAAEALKKEAEEAKKAEELKKKEAEEKKKAEE 1720

                         250       260       270       280       290
                  ....*....|....*....|....*....|....*....|....*....|..
gi 157277950  524 VKKQLQALSSELAQARdetKKTQNDVLHAENVKAGRDKYKTLRQIRQGNTKQ 575
Cdd:PTZ00121 1721 LKKAEEENKIKAEEAK---KEAEEDKKKAEEAKKDEEEKKKIAHLKKEEEKK 1769

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   278 KRILALCMGNHELYMRRRKPDTIEVQQMKAQARE---EKHQKQLERAQLENEKKKREiaeKEKERIEREKEELMERLRQI 354
Cdd:TIGR02169  307 ERSIAEKERELEDAEERLAKLEAEIDKLLAEIEElerEIEEERKRRDKLTEEYAELK---EELEDLRAELEEVDKEFAET 383

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   355 EEQTVKAQKELEEQTRKALELEQERQRAKEEAERLDRERRAAE-EAKSAIAKQAadqmknqeQLAAELAEFTAKIALLEE 433
Cdd:TIGR02169  384 RDELKDYREKLEKLKREINELKRELDRLQEELQRLSEELADLNaAIAGIEAKIN--------ELEEEKEDKALEIKKQEW 455

                          170       180       190
                   ....*....|....*....|....*....|.
gi 157277950   434 AKKKKEEEATEWQHKAFAAQEDLEKTKEELK 464
Cdd:TIGR02169  456 KLEQLAADLSKYEQELYDLKEEYDRVEKELS 486

FERM domain C-lobe/F3 of the ERM family; The ERM family includes ezrin, radixin, moesin and merlin. They are composed of a N-terminal FERM (ERM) domain (also called N-ERMAD (N-terminal ERM association domain)), a coiled coil region (CRR), and a C-terminal domain CERMAD (C-terminal ERM association domain) which has an F-actin-binding site (ABD). Two actin-binding sites have been identified in the middle and N-terminal domains. Merlin is structurally similar to the ERM proteins, but instead of an actin-binding domain (ABD), it contains a C-terminal domain (CTD), just like the proteins from the 4.1 family. Activated ezrin, radixin and moesin are thought to be involved in the linking of actin filaments to CD43, CD44, ICAM1-3 cell adhesion molecules, various membrane channels and receptors, such as the Na+/H+ exchanger-3 (NHE3), cystic fibrosis transmembrane conductance regulator (CFTR), and the beta2-adrenergic receptor. The ERM proteins exist in two states, a dormant state in which the FERM domain binds to its own C-terminal tail and thereby precludes binding of some partner proteins, and an activated state, in which the FERM domain binds to one of many membrane binding proteins and the C-terminal tail binds to F-actin. The FERM domain has a cloverleaf tripart structure composed of: (1) FERM_N (A-lobe or F1); (2) FERM_M (B-lobe, or F2); and (3) FERM_C (C-lobe or F3). The C-lobe/F3 within the FERM domain of ERM is part of the PH domain family. The FERM domain is found in the cytoskeletal-associated proteins such as ezrin, moesin, radixin, 4.1R, and merlin. These proteins provide a link between the membrane and cytoskeleton and are involved in signal transduction pathways. The FERM domain is also found in protein tyrosine phosphatases (PTPs), the tyrosine kinases FAK and JAK, in addition to other proteins involved in signaling. This domain is structurally similar to the PH and PTB domains and consequently is capable of binding to both peptides and phospholipids at different sites.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 200 MYGVNYFEIKNKKGTELWLGVDALGLNIYEHDDKLTPKIGFPWSEIRNISFNDKKFVIKPIDKKAPDFVFYAPRLRINKR 279
Cdd:cd13194    1 MYGVNYFEIKNKKGTDLWLGVDALGLNIYEPDNKLTPKIGFPWSEIRNISFNDKKFVIKPIDKKAPDFVFYSPRLRINKR 80

                         90
                 ....*....|....*..
gi 157277950 280 ILALCMGNHELYMRRRK 296
Cdd:cd13194   81 ILDLCMGNHELYMRRRK 97

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in the ERM family proteins, Ezrin, Radixin, and Moesin; The ezrin-radixin-moesin (ERM) family includes a group of closely related cytoskeletal proteins that plays an essential role in microvilli formation, T-cell activation, and tumor metastasis through providing a regulated linkage between F-actin and membrane-associated proteins. These proteins may also function in signaling cascades that regulate the assembly of actin stress fibers. The ERM proteins consist of an N-terminal FERM domain, a coiled-coil (CC) domain and a C-terminal tail segment (C-tail) containing a well-defined actin-binding motif. They exist in two states, a dormant state in which the FERM domain binds to its own C-terminal tail and thereby precludes binding of some partner proteins, and an activated state, in which the FERM domain binds to one of many membrane binding proteins and the C-terminal tail binds to F-actin. The FERM domain is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   5 INVRVTTMDAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDVKKENPLQFKFRAKF 84
Cdd:cd17187    1 VNVRVTTMDAELEFAIQPNTTGKQLFDQVVKTIGLREIWFFGLQYVDSKGYSTWLKLNKKVLSQDVKKENPLQFKFRAKF 80

                 ...
gi 157277950  85 FPE 87
Cdd:cd17187   81 YPE 83

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in radixin and similar proteins; Radixin is a member of the ezrin/radixin/moesin (ERM) family of cytoskeletal proteins that plays an essential role in microvilli formation, T-cell activation, and tumor metastasis through providing a regulated linkage between F-actin and membrane-associated proteins. These proteins may also function in signaling cascades that regulate the assembly of actin stress fibers. The ERM proteins consist of an N-terminal FERM domain, a coiled-coil (CC) domain and a C-terminal tail segment (C-tail) containing a well-defined actin-binding motif. The C-terminal domain can fold back to bind to the FERM domain forming an autoinhibited conformation. The FERM domain is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N). Radixin plays important roles in cell polarity, cell motility, invasion and tumor progression. It mediates the binding of F-actin to the plasma membrane after a conformational activation through Akt2-dependent phosphorylation at Thr564. It is also involved in reversal learning and short-term memory by regulating synaptic GABAA receptor density.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   5 INVRVTTMDAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDVKKENPLQFKFRAKF 84
Cdd:cd17238    1 INVRVTTMDAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDVKKENPLQFKFRAKF 80

                 ...
gi 157277950  85 FPE 87
Cdd:cd17238   81 FPE 83

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in the ERM family proteins; The ezrin-radixin-moesin (ERM) family includes a group of closely related cytoskeletal proteins that play an essential role in microvilli formation, T-cell activation, and tumor metastasis through providing a regulated linkage between F-actin and membrane-associated proteins. These proteins may also function in signaling cascades that regulate the assembly of actin stress fibers. The ERM proteins consist of an N-terminal FERM domain, a coiled-coil (CC) domain and a C-terminal tail segment (C-tail) containing a well-defined actin-binding motif. They exist in two states, a dormant state in which the FERM domain binds to its own C-terminal tail and thereby precludes binding of some partner proteins, and an activated state, in which the FERM domain binds to one of many membrane binding proteins and the C-terminal tail binds to F-actin. The FERM domain is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N). Merlin, which is highly related to the members of the ezrin, radixin, and moesin (ERM) protein family that are directly attached to and functionally linked with NHE1, is included in this family.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   5 INVRVTTMDAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDVKKENPLQFKFRAKF 84
Cdd:cd17097    1 INVRVTTMDAELEFSIKPKAKGRELFDLVCRTIGLRETWYFGLQYENKKGRVAWLKPDKKVLTQDVSKNNTLKFFFLVKF 80

                 ...
gi 157277950  85 FPE 87
Cdd:cd17097   81 YPE 83

FERM central domain; This domain is the central structural domain of the FERM domain.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   88 DVSEELIQEITQRLFFLQVKEAILNDEIYCPPETAVLLASYAVQAKYGDYNKEIHKPGYLANDRLLPQRVleQHKLTKEQ 167
Cdd:pfam00373   1 DLELLLQDEVTRHLLYLQAKDDILEGRLPCSEEEALLLAALQLQAEFGDYQPSSHTSEYLSLESFLPKQL--LRKMKSKE 78

                          90       100       110
                  ....*....|....*....|....*....|....*....
gi 157277950  168 WEERIQNWHEEHRGMLREDSMMEYLKIAQDLEMYGVNYF 206
Cdd:pfam00373  79 LEKRVLEAHKNLRGLSAEEAKLKYLQIAQSLPTYGVEFF 117

FERM C-terminal PH-like domain;

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950  210 NKKGTELWLGVDALGLNIYEHDDKLtpKIGFPWSEIRNISFNDKKFVIKPIDKKAPD-FVFYAPRLRINKRILALCMGNH 288
Cdd:pfam09380   1 DKEGTDLWLGVSAKGILVYEDNNKI--LNLFPWREIRKISFKRKKFLIKLRDKSSEEtLGFYTESSRACKYLWKLCVEQH 78

                  ....*..
gi 157277950  289 ELYMRRR 295
Cdd:pfam09380  79 TFFRLRR 85

Ras-associating (RA) domain, FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F0/F1 sub-domain, structurally similar to a beta-grasp ubiquitin-like fold; RA domain-containing proteins function by interacting, directly or indirectly, with Ras proteins and are involved in several different functions ranging from tumor suppression to being oncoproteins. Ras protein is a small GTPase that is involved in cellular signal transduction. The RA domain has the beta-grasp ubiquitin-like (Ubl) fold with low sequence similarity to ubiquitin (Ub). Ub is a protein modifier in eukaryotes that is involved in various cellular processes, including transcriptional regulation, cell cycle control, and DNA repair in eukaryotes. RA-containing proteins include RalGDS, AF6, RIN, RASSF1, SNX27, CYR1, STE50, and phospholipase C epsilon. The FERM domain is present at the N-terminus of a large and diverse group of proteins that mediate linkage of the cytoskeleton to the plasma membrane. FERM-containing proteins are ubiquitous components of the cytocortex and are involved in cell transport, cell structure and signaling. The FERM domain is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, also known as the N-terminal Ubl-like structural domain of the FERM domain (FERM_N), which is structurally similar to Ub. Some FERM domain-containing proteins contain an N-terminal region, which also has the beta-grasp Ub-like fold, precedes the FERM domain and has been referred to as the F0 domain.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950   6 NVRVTTM-----DAELEFAIQPNTTGKQLFDQVVKTVGLR-----------EVWFFGLQYVDSK-------------GYS 56
Cdd:cd01768    1 VLKIFGAglasgANYKSVLATARSTARELVAEALERYGLAgspgggpgessCVDAFALCDALGRpaaagvgsgewraEHL 80

                         90       100       110
                 ....*....|....*....|....*....|
gi 157277950  57 TWLKLNKKVTQQ----DVKKENPLQFKFRA 82
Cdd:cd01768   81 RVLGDSERPLLVqelwRARPGWARRFELRG 110

FERM domain C-lobe; The FERM domain has a cloverleaf tripart structure composed of: (1) FERM_N (A-lobe or F1); (2) FERM_M (B-lobe, or F2); and (3) FERM_C (C-lobe or F3). The C-lobe/F3 within the FERM domain is part of the PH domain family. The FERM domain is found in the cytoskeletal-associated proteins such as ezrin, moesin, radixin, 4.1R, and merlin. These proteins provide a link between the membrane and cytoskeleton and are involved in signal transduction pathways. The FERM domain is also found in protein tyrosine phosphatases (PTPs), the tyrosine kinases FAK and JAK, in addition to other proteins involved in signaling. This domain is structurally similar to the PH and PTB domains and consequently is capable of binding to both peptides and phospholipids at different sites.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 202 GVNYFEIKNK--KGTELWLGVDALGLNIYEHDDKlTPKIGFPWSEIRNISFN-DKKFVIKPIDKKAPDFVFYAPRLRINK 278
Cdd:cd00836    1 GVEFFPVKDKskKGSPIILGVNPEGISVYDELTG-QPLVLFPWPNIKKISFSgAKKFTIVVADEDKQSKLLFQTPSRQAK 79

                         90
                 ....*....|....
gi 157277950 279 RILALCMGNHELYM 292
Cdd:cd00836   80 EIWKLIVGYHRFLL 93

Ezrin/radixin/moesin, alpha-helical domain; The ERM family consists of three closely-related proteins, ezrin, radixin and moesin. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions, and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). ERM molecules contain 3 domains, an N-terminal globular domain, an extended alpha-helical domain and a charged C-terminal domain (pfam00769). Ezrin, radixin and merlin also contain a polyproline linker region between the helical and C-terminal domains. The N-terminal domain is highly conserved and is also found in merlin, band 4.1 proteins and members of the band 4.1 superfamily, designated the FERM domain. ERM proteins crosslink actin filaments with plasma membranes. They co-localize with CD44 at actin filament plasma membrane interaction sites, associating with CD44 via their N-terminal domains and with actin filaments via their C-terminal domains. This is the alpha-helical domain, which is involved in intramolecular masking of protein-protein interaction sites, regulating the activity of this proteins.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950  347 LMERLRQIEEQTVKAQKELEEQTRKALELEQERQRAKEEAERLDRERRAAEEAKSAIAKQAADQMKNQEQLAAELAEFTA 426
Cdd:pfam20492  11 LEERLKQYEEETKKAQEELEESEETAEELEEERRQAEEEAERLEQKRQEAEEEKERLEESAEMEAEEKEQLEAELAEAQE 90

                          90       100       110
                  ....*....|....*....|....*....|
gi 157277950  427 KIALLEEAKKKKEEEATEWQHKAFAAQEDL 456
Cdd:pfam20492  91 EIARLEEEVERKEEEARRLQEELEEAREEE 120

FERM domain C-lobe of FERM domain-containing protein 4A and 4B (FRMD4A and 4B); FRMD4A is part of the Par-3/FRMD4A/cytohesin-1 complex that activates Arf6, a central player in actin cytoskeleton dynamics and membrane trafficking, during junctional remodeling and epithelial polarization. The Par-3/Par-6/aPKC/Cdc42 complex regulates the conversion of primordial adherens junctions (AJs) into belt-like AJs and the formation of linear actin cables. When primordial AJs are formed, Par-3 recruits scaffolding protein FRMD4A which connects Par-3 and the Arf6 guanine-nucleotide exchange factor (GEF), cytohesin-1. FRMD4B (also called GRP1-binding protein, GRSP1) is a novel member of GRP1 signaling complexes that are recruited to plasma membrane ruffles in response to insulin receptor signaling. The GRSP1/FRMD4B protein contains a FERM protein domain as well as two coiled coil domains and may function as a scaffolding protein. GRP1 and GRSP1 interact through the coiled coil domains in the two proteins. The FERM domain has a cloverleaf tripart structure composed of: (1) FERM_N (A-lobe or F1); (2) FERM_M (B-lobe, or F2); and (3) FERM_C (C-lobe or F3). The C-lobe/F3 within the FERM domain is part of the PH domain family. The FERM domain is found in the cytoskeletal-associated proteins such as ezrin, moesin, radixin, 4.1R, and merlin. These proteins provide a link between the membrane and cytoskeleton and are involved in signal transduction pathways. The FERM domain is also found in protein tyrosine phosphatases (PTPs) , the tyrosine kinases FAK and JAK, in addition to other proteins involved in signaling. This domain is structurally similar to the PH and PTB domains and consequently is capable of binding to both peptides and phospholipids at different sites.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 202 GVNYFEIKNKKGTELWLGVDALGLNIYEHDDKLTPKIGFPWSEIRNISFNDKKFVIKPID-KKAPD-------------F 267
Cdd:cd13191    1 GVHYYEVKDKNGIPWWLGVSYKGIGQYDLQDKVKPRKFFQWKQLENLYFRDRKFSIEVRDpRRNSHrsrrtfqsssvsvH 80

                         90       100
                 ....*....|....*....|....*....
gi 157277950 268 VFYAPRLRINKRILALCMGNHELYMRRRK 296
Cdd:cd13191   81 VWYGQTPALCKTIWSMAIAQHQFYLDRKQ 109

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 298 DTIEVQQMKAQAREEKHQKQLERAQLENEKKKREIAEKEKERIEREKEELMERLRQIEEQTVKAQKELEEQTRKALELEQ 377
Cdd:COG1196  223 KELEAELLLLKLRELEAELEELEAELEELEAELEELEAELAELEAELEELRLELEELELELEEAQAEEYELLAELARLEQ 302

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 378 ERQRAKEEAERLDRERRAAEEAKSAIAKQAADQMKNQEQLAAELAEFTAKIALLEEAKKKKEEEATEWQHKAFAAQEDLE 457
Cdd:COG1196  303 DIARLEERRRELEERLEELEEELAELEEELEELEEELEELEEELEEAEEELEEAEAELAEAEEALLEAEAELAEAEEELE 382

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 458 KTKEELKTVMSAPPPPPPPPVIPPTENEHDEQDENSAEASAElssegvmnhRSEEERVTETQKNERVKKQLQALSSELAQ 537
Cdd:COG1196  383 ELAEELLEALRAAAELAAQLEELEEAEEALLERLERLEEELE---------ELEEALAELEEEEEEEEEALEEAAEEEAE 453

                        250       260       270       280
                 ....*....|....*....|....*....|....*....|....*.
gi 157277950 538 ARDETKKTQNDVLHAENVKAGRDKYKTLRQIRQGNTKQRIDEFEAM 583
Cdd:COG1196  454 LEEEEEALLELLAELLEEAALLEAALAELLEELAEAAARLLLLLEA 499

FERM domain C-lobe of Protein tyrosine phosphatase non-receptor 13 (PTPH13); There are many functions of PTPN13 (also called PTPL1, PTP-BAS, hPTP1E, FAP1, or PTPL1). Mice lacking PTPN13 activity have abnormal regulation of signal transducer and activator of transcription signaling in their T cells, mild impairment of motor nerve repair, and a significant reduction in the growth of retinal glia cultures. It also plays a role in adipocyte differentiation. PTPN13 contains a kinase non-catalytic C-lobe domain (KIND), a FERM domain with two potential phosphatidylinositol 4,5-biphosphate [PtdIns(4,5)P2]-binding motifs, 5 PDZ domains, and a carboxy-terminal catalytic domain. There is an nteraction between the FERM domain of PTPL1 and PtdIns(4,5)P2 which is thought to regulate the membrane localization of PTPN13. PDZ are protein/protein interaction domains so there is the potential for numerous partners that can actively participate in the regulation of its phosphatase activity or can permit direct or indirect recruitment of tyrosine phosphorylated PTPL1 substrates. The FERM domain has a cloverleaf tripart structure composed of: (1) FERM_N (A-lobe or F1); (2) FERM_M (B-lobe, or F2); and (3) FERM_C (C-lobe or F3). The C-lobe/F3 within the FERM domain is part of the PH domain family. The FERM domain is found in the cytoskeletal-associated proteins such as ezrin, moesin, radixin, 4.1R, and merlin. These proteins provide a link between the membrane and cytoskeleton and are involved in signal transduction pathways. The FERM domain is also found in protein tyrosine phosphatases (PTPs), the tyrosine kinases FAK and JAK, in addition to other proteins involved in signaling. This domain is structurally similar to the PH and PTB domains and consequently is capable of binding to both peptides and phospholipids at different sites.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 206 FEIKNKKGTELWLGVDALGLNIYE-HDDKLTPKIGFPWSEIRNISFNDKKFVIKPIDKKAPDFVFYAPRLRINKRILALC 284
Cdd:cd13187    8 YREKKSSTLSLWLGICSRGIIIYEeKNGARTPVLRFPWRETQKISFDKKKFTIESRGGSGIKHTFYTDSYKKSQYLLQLC 87

                         90
                 ....*....|....*
gi 157277950 285 MGNHE--LYMRRRKP 297
Cdd:cd13187   88 SAQHKfhIQMRSRQS 102

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 308 QAREEKHQKQLERAQLENEKKKREIAEKEKERIEREKEELMERLRQIEEQTVKAQKELEEQTRKALELEQERQRAKEEAE 387
Cdd:COG1196  219 KEELKELEAELLLLKLRELEAELEELEAELEELEAELEELEAELAELEAELEELRLELEELELELEEAQAEEYELLAELA 298

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 388 RLDRERRAAEEAKSAIAKQAADQMKNQEQLAAELAEFTAKIALLEEAKKKKEEEATEWQhkafAAQEDLEKTKEELKTVM 467
Cdd:COG1196  299 RLEQDIARLEERRRELEERLEELEEELAELEEELEELEEELEELEEELEEAEEELEEAE----AELAEAEEALLEAEAEL 374

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 468 SAPPPPPPPPVIPPTENEHDEQDENSAEASAELSSEGVMNHRS--EEERVTETQKNERVKKQLQALSSELAQARDETKKT 545
Cdd:COG1196  375 AEAEEELEELAEELLEALRAAAELAAQLEELEEAEEALLERLErlEEELEELEEALAELEEEEEEEEEALEEAAEEEAEL 454

                        250       260       270
                 ....*....|....*....|....*....|.
gi 157277950 546 QNDVLHAENVKAgRDKYKTLRQIRQGNTKQR 576
Cdd:COG1196  455 EEEEEALLELLA-ELLEEAALLEAALAELLE 484

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in FERM domain-containing protein 4B (FRMD4B); FRMD4B, also termed GRP1-binding protein GRSP1, interacts with the coil-coil domain of ARF exchange factor GRP1 to form the Grsp1-Grp1 complex that co-localizes with cortical actin rich regions in response to stimulation of CHO-T cells with insulin or epidermal growth factor (EGF). FRMD4B contains a FERM protein interaction domain as well as two coiled coil domains and may therefore function as a scaffolding protein. The FERM domain is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 157277950  13 DAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDV-KKENPLQFKFRAKFFPEDV 89
Cdd:cd17200   12 DRKLELLVQPKLLSRELLDLVASHFNLKEKEYFGITFIDDTGQSNWLQLDHRVLDHDLpKKSGPVTLYFAVRFYIESI 89

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in FERM domain-containing proteins FRMD4A, FRMD4B, and similar proteins; This family includes FERM domain-containing proteins FRMD4A and FRMD4B, both of which contain a FERM domain that is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N). FRMD4A is a cytohesin adaptor involved in cell structure, transport and signaling. It promotes the growth of cancer cells in tongue, head and neck squamous cell carcinomas. FRMD4B, also termed GRP1-binding protein GRSP1, interacts with the coil-coil domain of ARF exchange factor GRP1 to form the Grsp1-Grp1 complex that co-localizes with cortical actin rich regions in response to stimulation of CHO-T cells with insulin or epidermal growth factor (EGF).

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950  13 DAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDVKKEN---PLQFKFRAKFFPEDV 89
Cdd:cd17103   12 DRRLEILVQPKLLAGDLLDLVASHFNLKEKEYFGLAYEDETGHYNWLQLDKRVLDHEFPKKWssgPLVLHFAVKFYVESI 91

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in FERM domain-containing protein 7 (FRMD7); FRMD7 plays an important role in neuronal development and is involved in the regulation of F-actin, neurofilament, and microtubule dynamics. It interacts with the Rho GTPase regulator, RhoGDIalpha, and activates the Rho subfamily member Rac1, which regulates reorganization of actin filaments and controls neuronal outgrowth. Mutations in the FRMD7 gene are responsible for the X-linked idiopathic congenital nystagmus (ICN), a disease which affects ocular motor control. FRMD7 contains a FERM domain, and a pleckstrin homology (PH) domain. The FERM domain is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 157277950  13 DAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQdVKKENPLQFKFRAKFFPED 88
Cdd:cd17188   11 DSQKVFVVDQKSTGKDLFNMSCSHLNLVEKEYFGLEFRNHAGNNVWLELLKPITKQ-IKNPKELIFKFTVKFFPVD 85

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 301 EVQQMKAQAREEKHQKQLERAQLENEKKKREIAEKEKERIEREKEELMERLRQIEEQTVKAQKELEEQTRKALELEQERQ 380
Cdd:COG1196  331 ELEELEEELEELEEELEEAEEELEEAEAELAEAEEALLEAEAELAEAEEELEELAEELLEALRAAAELAAQLEELEEAEE 410

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 381 RAKEEAERLDRERRAAEEAKSAIAKQAADQMKNQEQLAAELAEFTAKIALLEEAKKKKEEEATEWQHKAFAAQEDLEKTK 460
Cdd:COG1196  411 ALLERLERLEEELEELEEALAELEEEEEEEEEALEEAAEEEAELEEEEEALLELLAELLEEAALLEAALAELLEELAEAA 490

                        170       180       190       200       210       220       230       240
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 461 EELKTVMSAPPPPPPPPVIPPTENEHDEQ------------DENSAEASAELSSEGVMNHRSEEERVTETQKNERVKKQL 528
Cdd:COG1196  491 ARLLLLLEAEADYEGFLEGVKAALLLAGLrglagavavligVEAAYEAALEAALAAALQNIVVEDDEVAAAAIEYLKAAK 570

                        250       260       270
                 ....*....|....*....|....*....|..
gi 157277950 529 QALSSELAQARDETKKTQNDVLHAENVKAGRD 560
Cdd:COG1196  571 AGRATFLPLDKIRARAALAAALARGAIGAAVD 602

FERM (Four.1 protein, Ezrin, Radixin, Moesin) domain, F1 sub-domain, found in FERM domain-containing protein 4A (FRMD4A); FRMD4A is a cytohesin adaptor involved in cell structure, transport and signaling. It promotes the growth of cancer cells in tongue, head and neck squamous cell carcinomas. It also regulates tau secretion by activating cytohesin-Arf6 signaling through connecting cytohesin family Arf6-specific guanine-nucleotide exchange factors (GEFs) and Par-3 at primordial adherens junctions during epithelial polarization. As a genetic risk factor for late-onset Alzheimer's disease (AD), FRMD4A may play a role in amyloidogenic and tau-related pathways in AD. FRMD4A contains a FERM domain that is made up of three sub-domains, F1, F2, and F3. This family corresponds to the F1 sub-domain, which is also called the N-terminal ubiquitin-like structural domain of the FERM domain (FERM_N).

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 157277950  13 DAELEFAIQPNTTGKQLFDQVVKTVGLREVWFFGLQYVDSKGYSTWLKLNKKVTQQDV-KKENPLQFKFRAKFFPEDV 89
Cdd:cd17199   12 DRKLELLVQPKLLAKELLDLVASHFNLKEKEYFGIAFTDETGHLNWLQLDRRVLEHDFpKKSGPVVLYFCVRFYIESI 89

FERM domain C-lobe of FERM domain-containing protein 3 and 5 (FRMD3 and 5); FRMD3 (also called Band 4.1-like protein 4O/4.1O though it is not a true member of that family) is a novel putative tumor suppressor gene that is implicated in the origin and progression of lung cancer. In humans there are 5 isoforms that are produced by alternative splicing. Less is known about FRMD5, though there are 2 isoforms of the human protein are produced by alternative splicing. Both FRMD3 and FRMD5 contain a N-terminal FERM domain, followed by a FERM adjacent (FA) domain, and 4.1 protein C-terminal domain (CTD). The FERM domain has a cloverleaf tripart structure composed of: (1) FERM_N (A-lobe or F1); (2) FERM_M (B-lobe, or F2); and (3) FERM_C (C-lobe or F3). The C-lobe/F3 within the FERM domain is part of the PH domain family. The FERM domain is found in the cytoskeletal-associated proteins such as ezrin, moesin, radixin, 4.1R, and merlin. These proteins provide a link between the membrane and cytoskeleton and are involved in signal transduction pathways. The FERM domain is also found in protein tyrosine phosphatases (PTPs), the tyrosine kinases FAK and JAK, in addition to other proteins involved in signaling. This domain is structurally similar to the PH and PTB domains and consequently is capable of binding to both peptides and phospholipids at different sites.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 157277950 187 SMMEYLKIAQDLEMYGVNYFEIKNKKGTELWLGVDALGLNIYEHDDKLTpkiGFPWSEIRNISFNDKKF---VIKPIDKK 263
Cdd:cd13192    1 AEDNFLRKAATLETYGVDPHPVKDHRGNQLYLGFTHTGIVTFQGGKRVH---HFRWNDITKFNYEGKMFilhVMQKEEKK 77