Chain F, Ras-related GTP-binding protein A
Protein Classification
GTR/RAG family GTP-binding protein( domain architecture ID 10183650)
GTR/RAG family GTP-binding protein similar to yeast GTP-binding protein GTR1, the GTPase component of the GSE complex, a GTPase complex required for intracellular sorting of GAP1 out of the endosome
List of domain hits
| Name | Accession | Description | Interval | E-value | |||||
| RagA_like | cd11384 | Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins A and ... |
9-292 | 0e+00 | |||||
Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins A and B; RagA and RagB are closely related Rag GTPases (ras-related GTP-binding protein A and B) that constitute a unique subgroup of the Ras superfamily, and are functional homologs of Saccharomyces cerevisiae Gtr1. These domains function by forming heterodimers with RagC or RagD, and similarly, Gtr1 dimerizes with Gtr2, through the carboxy-terminal segments. They play an essential role in regulating amino acid-induced target of rapamycin complex 1 (TORC1) kinase signaling, exocytic cargo sorting at endosomes, and epigenetic control of gene expression. In response to amino acids, the Rag GTPases guide the TORC1 complex to activate the platform containing Rheb proto-oncogene by driving the relocalization of mTORC1 from discrete locations in the cytoplasm to a late endosomal and/or lysosomal compartment that is Rheb-enriched and contains Rab-7. : Pssm-ID: 206744 Cd Length: 286 Bit Score: 583.40 E-value: 0e+00
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| Name | Accession | Description | Interval | E-value | |||||
| RagA_like | cd11384 | Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins A and ... |
9-292 | 0e+00 | |||||
Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins A and B; RagA and RagB are closely related Rag GTPases (ras-related GTP-binding protein A and B) that constitute a unique subgroup of the Ras superfamily, and are functional homologs of Saccharomyces cerevisiae Gtr1. These domains function by forming heterodimers with RagC or RagD, and similarly, Gtr1 dimerizes with Gtr2, through the carboxy-terminal segments. They play an essential role in regulating amino acid-induced target of rapamycin complex 1 (TORC1) kinase signaling, exocytic cargo sorting at endosomes, and epigenetic control of gene expression. In response to amino acids, the Rag GTPases guide the TORC1 complex to activate the platform containing Rheb proto-oncogene by driving the relocalization of mTORC1 from discrete locations in the cytoplasm to a late endosomal and/or lysosomal compartment that is Rheb-enriched and contains Rab-7. Pssm-ID: 206744 Cd Length: 286 Bit Score: 583.40 E-value: 0e+00
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| Gtr1_RagA | pfam04670 | Gtr1/RagA G protein conserved region; GTR1 was first identified in S. cerevisiae as a ... |
9-235 | 2.05e-133 | |||||
Gtr1/RagA G protein conserved region; GTR1 was first identified in S. cerevisiae as a suppressor of a mutation in RCC1. Biochemical analysis revealed that Gtr1 is in fact a G protein of the Ras family. The RagA/B proteins are the human homologs of Gtr1. Included in this family is the human Rag C, a novel protein that has been shown to interact with RagA/B. Pssm-ID: 398377 [Multi-domain] Cd Length: 231 Bit Score: 378.08 E-value: 2.05e-133
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| Gem1 | COG1100 | GTPase SAR1 family domain [General function prediction only]; |
7-163 | 5.42e-07 | |||||
GTPase SAR1 family domain [General function prediction only]; Pssm-ID: 440717 [Multi-domain] Cd Length: 177 Bit Score: 48.82 E-value: 5.42e-07
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| PLN03118 | PLN03118 | Rab family protein; Provisional |
9-163 | 1.76e-06 | |||||
Rab family protein; Provisional Pssm-ID: 215587 [Multi-domain] Cd Length: 211 Bit Score: 48.13 E-value: 1.76e-06
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| small_GTP | TIGR00231 | small GTP-binding protein domain; Proteins with a small GTP-binding domain recognized by this ... |
8-135 | 8.24e-06 | |||||
small GTP-binding protein domain; Proteins with a small GTP-binding domain recognized by this model include Ras, RhoA, Rab11, translation elongation factor G, translation initiation factor IF-2, tetratcycline resistance protein TetM, CDC42, Era, ADP-ribosylation factors, tdhF, and many others. In some proteins the domain occurs more than once.This model recognizes a large number of small GTP-binding proteins and related domains in larger proteins. Note that the alpha chains of heterotrimeric G proteins are larger proteins in which the NKXD motif is separated from the GxxxxGK[ST] motif (P-loop) by a long insert and are not easily detected by this model. [Unknown function, General] Pssm-ID: 272973 [Multi-domain] Cd Length: 162 Bit Score: 45.06 E-value: 8.24e-06
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| Name | Accession | Description | Interval | E-value | |||||
| RagA_like | cd11384 | Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins A and ... |
9-292 | 0e+00 | |||||
Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins A and B; RagA and RagB are closely related Rag GTPases (ras-related GTP-binding protein A and B) that constitute a unique subgroup of the Ras superfamily, and are functional homologs of Saccharomyces cerevisiae Gtr1. These domains function by forming heterodimers with RagC or RagD, and similarly, Gtr1 dimerizes with Gtr2, through the carboxy-terminal segments. They play an essential role in regulating amino acid-induced target of rapamycin complex 1 (TORC1) kinase signaling, exocytic cargo sorting at endosomes, and epigenetic control of gene expression. In response to amino acids, the Rag GTPases guide the TORC1 complex to activate the platform containing Rheb proto-oncogene by driving the relocalization of mTORC1 from discrete locations in the cytoplasm to a late endosomal and/or lysosomal compartment that is Rheb-enriched and contains Rab-7. Pssm-ID: 206744 Cd Length: 286 Bit Score: 583.40 E-value: 0e+00
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| Gtr1_RagA | pfam04670 | Gtr1/RagA G protein conserved region; GTR1 was first identified in S. cerevisiae as a ... |
9-235 | 2.05e-133 | |||||
Gtr1/RagA G protein conserved region; GTR1 was first identified in S. cerevisiae as a suppressor of a mutation in RCC1. Biochemical analysis revealed that Gtr1 is in fact a G protein of the Ras family. The RagA/B proteins are the human homologs of Gtr1. Included in this family is the human Rag C, a novel protein that has been shown to interact with RagA/B. Pssm-ID: 398377 [Multi-domain] Cd Length: 231 Bit Score: 378.08 E-value: 2.05e-133
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| Rag | cd09915 | Rag GTPase subfamily of Ras-related GTPases; Rag GTPases (ras-related GTP-binding proteins) ... |
9-181 | 1.57e-50 | |||||
Rag GTPase subfamily of Ras-related GTPases; Rag GTPases (ras-related GTP-binding proteins) constitute a unique subgroup of the Ras superfamily, playing an essential role in regulating amino acid-induced target of rapamycin complex 1 (TORC1) kinase signaling, exocytic cargo sorting at endosomes, and epigenetic control of gene expression. This subfamily consists of RagA and RagB as well as RagC and RagD that are closely related. Saccharomyces cerevisiae encodes single orthologs of metazoan RagA/B and RagC/D, Gtr1 and Gtr2, respectively. Dimer formation is important for their cellular function; these domains form heterodimers, as RagA or RagB dimerizes with RagC or RagD, and similarly, Gtr1 dimerizes with Gtr2. In response to amino acids, the Rag GTPases guide the TORC1 complex to activate the platform containing Rheb proto-oncogene by driving the relocalization of mTORC1 from discrete locations in the cytoplasm to a late endosomal and/or lysosomal compartment that is Rheb-enriched and contains Rab-7. Pssm-ID: 206742 [Multi-domain] Cd Length: 175 Bit Score: 165.04 E-value: 1.57e-50
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| RagC_like | cd11385 | Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins C and ... |
9-181 | 3.59e-14 | |||||
Rag GTPase, subfamily of Ras-related GTPases, includes Ras-related GTP-binding proteins C and D; RagC and RagD are closely related Rag GTPases (ras-related GTP-binding protein C and D) that constitute a unique subgroup of the Ras superfamily, and are functional homologs of Saccharomyces cerevisiae Gtr2. These domains form heterodimers with RagA or RagB, and similarly, Gtr2 dimerizes with Gtr1 in order to function. They play an essential role in regulating amino acid-induced target of rapamycin complex 1 (TORC1) kinase signaling, exocytic cargo sorting at endosomes, and epigenetic control of gene expression. In response to amino acids, the Rag GTPases guide the TORC1 complex to activate the platform containing Rheb proto-oncogene by driving the relocalization of mTORC1 from discrete locations in the cytoplasm to a late endosomal and/or lysosomal compartment that is Rheb-enriched and contains Rab-7. Pssm-ID: 206745 [Multi-domain] Cd Length: 175 Bit Score: 69.17 E-value: 3.59e-14
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| Ras_like_GTPase | cd00882 | Rat sarcoma (Ras)-like superfamily of small guanosine triphosphatases (GTPases); Ras-like ... |
11-163 | 3.11e-10 | |||||
Rat sarcoma (Ras)-like superfamily of small guanosine triphosphatases (GTPases); Ras-like GTPase superfamily. The Ras-like superfamily of small GTPases consists of several families with an extremely high degree of structural and functional similarity. The Ras superfamily is divided into at least four families in eukaryotes: the Ras, Rho, Rab, and Sar1/Arf families. This superfamily also includes proteins like the GTP translation factors, Era-like GTPases, and G-alpha chain of the heterotrimeric G proteins. Members of the Ras superfamily regulate a wide variety of cellular functions: the Ras family regulates gene expression, the Rho family regulates cytoskeletal reorganization and gene expression, the Rab and Sar1/Arf families regulate vesicle trafficking, and the Ran family regulates nucleocytoplasmic transport and microtubule organization. The GTP translation factor family regulates initiation, elongation, termination, and release in translation, and the Era-like GTPase family regulates cell division, sporulation, and DNA replication. Members of the Ras superfamily are identified by the GTP binding site, which is made up of five characteristic sequence motifs, and the switch I and switch II regions. Pssm-ID: 206648 [Multi-domain] Cd Length: 161 Bit Score: 57.85 E-value: 3.11e-10
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| Gem1 | COG1100 | GTPase SAR1 family domain [General function prediction only]; |
7-163 | 5.42e-07 | |||||
GTPase SAR1 family domain [General function prediction only]; Pssm-ID: 440717 [Multi-domain] Cd Length: 177 Bit Score: 48.82 E-value: 5.42e-07
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| PLN03118 | PLN03118 | Rab family protein; Provisional |
9-163 | 1.76e-06 | |||||
Rab family protein; Provisional Pssm-ID: 215587 [Multi-domain] Cd Length: 211 Bit Score: 48.13 E-value: 1.76e-06
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| Ras | pfam00071 | Ras family; Includes sub-families Ras, Rab, Rac, Ral, Ran, Rap Ypt1 and more. Shares P-loop ... |
9-157 | 3.13e-06 | |||||
Ras family; Includes sub-families Ras, Rab, Rac, Ral, Ran, Rap Ypt1 and more. Shares P-loop motif with GTP_EFTU, arf and myosin_head. See pfam00009 pfam00025, pfam00063. As regards Rab GTPases, these are important regulators of vesicle formation, motility and fusion. They share a fold in common with all Ras GTPases: this is a six-stranded beta-sheet surrounded by five alpha-helices. Pssm-ID: 425451 [Multi-domain] Cd Length: 162 Bit Score: 46.35 E-value: 3.13e-06
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| small_GTP | TIGR00231 | small GTP-binding protein domain; Proteins with a small GTP-binding domain recognized by this ... |
8-135 | 8.24e-06 | |||||
small GTP-binding protein domain; Proteins with a small GTP-binding domain recognized by this model include Ras, RhoA, Rab11, translation elongation factor G, translation initiation factor IF-2, tetratcycline resistance protein TetM, CDC42, Era, ADP-ribosylation factors, tdhF, and many others. In some proteins the domain occurs more than once.This model recognizes a large number of small GTP-binding proteins and related domains in larger proteins. Note that the alpha chains of heterotrimeric G proteins are larger proteins in which the NKXD motif is separated from the GxxxxGK[ST] motif (P-loop) by a long insert and are not easily detected by this model. [Unknown function, General] Pssm-ID: 272973 [Multi-domain] Cd Length: 162 Bit Score: 45.06 E-value: 8.24e-06
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| RabL3 | cd04102 | Rab GTPase-like family 3 (Rab-like3); RabL3 (Rab-like3) subfamily. RabL3s are novel proteins ... |
9-113 | 1.29e-05 | |||||
Rab GTPase-like family 3 (Rab-like3); RabL3 (Rab-like3) subfamily. RabL3s are novel proteins that have high sequence similarity with Rab family members, but display features that are distinct from Rabs, and have been termed Rab-like. As in other Rab-like proteins, RabL3 lacks a prenylation site at the C-terminus. The specific function of RabL3 remains unknown. Pssm-ID: 206689 Cd Length: 204 Bit Score: 45.28 E-value: 1.29e-05
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| Roc | pfam08477 | Ras of Complex, Roc, domain of DAPkinase; Roc, or Ras of Complex, proteins are mitochondrial ... |
9-130 | 4.62e-05 | |||||
Ras of Complex, Roc, domain of DAPkinase; Roc, or Ras of Complex, proteins are mitochondrial Rho proteins (Miro-1, and Miro-2) and atypical Rho GTPases. Full-length proteins have a unique domain organization, with tandem GTP-binding domains and two EF hand domains (pfam00036) that may bind calcium. They are also larger than classical small GTPases. It has been proposed that they are involved in mitochondrial homeostasis and apoptosis. Pssm-ID: 462490 [Multi-domain] Cd Length: 114 Bit Score: 42.11 E-value: 4.62e-05
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| Arf_Arl | cd00878 | ADP-ribosylation factor(Arf)/Arf-like (Arl) small GTPases; Arf (ADP-ribosylation factor)/Arl ... |
9-139 | 8.11e-05 | |||||
ADP-ribosylation factor(Arf)/Arf-like (Arl) small GTPases; Arf (ADP-ribosylation factor)/Arl (Arf-like) small GTPases. Arf proteins are activators of phospholipase D isoforms. Unlike Ras proteins they lack cysteine residues at their C-termini and therefore are unlikely to be prenylated. Arfs are N-terminally myristoylated. Members of the Arf family are regulators of vesicle formation in intracellular traffic that interact reversibly with membranes of the secretory and endocytic compartments in a GTP-dependent manner. They depart from other small GTP-binding proteins by a unique structural device, interswitch toggle, that implements front-back communication from N-terminus to the nucleotide binding site. Arf-like (Arl) proteins are close relatives of the Arf, but only Arl1 has been shown to function in membrane traffic like the Arf proteins. Arl2 has an unrelated function in the folding of native tubulin, and Arl4 may function in the nucleus. Most other Arf family proteins are so far relatively poorly characterized. Thus, despite their significant sequence homologies, Arf family proteins may regulate unrelated functions. Pssm-ID: 206644 [Multi-domain] Cd Length: 158 Bit Score: 42.18 E-value: 8.11e-05
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| YfjP | cd11383 | YfjP GTPase; The Era (E. coli Ras-like protein)-like YfjP subfamily includes several ... |
11-132 | 2.75e-04 | |||||
YfjP GTPase; The Era (E. coli Ras-like protein)-like YfjP subfamily includes several uncharacterized bacterial GTPases that are similar to Era. They generally show sequence conservation in the region between the Walker A and B motifs (G1 and G3 box motifs), to the exclusion of other GTPases. Era is characterized by a distinct derivative of the KH domain (the pseudo-KH domain) which is located C-terminal to the GTPase domain. Pssm-ID: 206743 [Multi-domain] Cd Length: 140 Bit Score: 40.40 E-value: 2.75e-04
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| Arl3 | cd04155 | Arf-like 3 (Arl3) GTPase; Arl3 (Arf-like 3) is an Arf family protein that differs from most ... |
1-133 | 5.60e-04 | |||||
Arf-like 3 (Arl3) GTPase; Arl3 (Arf-like 3) is an Arf family protein that differs from most Arf family members in the N-terminal extension. In is inactive, GDP-bound form, the N-terminal extension forms an elongated loop that is hydrophobically anchored into the membrane surface; however, it has been proposed that this region might form a helix in the GTP-bound form. The delta subunit of the rod-specific cyclic GMP phosphodiesterase type 6 (PDEdelta) is an Arl3 effector. Arl3 binds microtubules in a regulated manner to alter specific aspects of cytokinesis via interactions with retinitis pigmentosa 2 (RP2). It has been proposed that RP2 functions in concert with Arl3 to link the cell membrane and the cytoskeleton in photoreceptors as part of the cell signaling or vesicular transport machinery. In mice, the absence of Arl3 is associated with abnormal epithelial cell proliferation and cyst formation. Pssm-ID: 206721 [Multi-domain] Cd Length: 174 Bit Score: 40.07 E-value: 5.60e-04
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| YeeP | COG3596 | Predicted GTPase [General function prediction only]; |
10-211 | 1.37e-03 | |||||
Predicted GTPase [General function prediction only]; Pssm-ID: 442815 [Multi-domain] Cd Length: 318 Bit Score: 39.75 E-value: 1.37e-03
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| Ras | cd00876 | Rat sarcoma (Ras) family of small guanosine triphosphatases (GTPases); The Ras family of the ... |
9-163 | 4.59e-03 | |||||
Rat sarcoma (Ras) family of small guanosine triphosphatases (GTPases); The Ras family of the Ras superfamily includes classical N-Ras, H-Ras, and K-Ras, as well as R-Ras, Rap, Ral, Rheb, Rhes, ARHI, RERG, Rin/Rit, RSR1, RRP22, Ras2, Ras-dva, and RGK proteins. Ras proteins regulate cell growth, proliferation and differentiation. Ras is activated by guanine nucleotide exchange factors (GEFs) that release GDP and allow GTP binding. Many RasGEFs have been identified. These are sequestered in the cytosol until activation by growth factors triggers recruitment to the plasma membrane or Golgi, where the GEF colocalizes with Ras. Active GTP-bound Ras interacts with several effector proteins: among the best characterized are the Raf kinases, phosphatidylinositol 3-kinase (PI3K), RalGEFs and NORE/MST1. Most Ras proteins contain a lipid modification site at the C-terminus, with a typical sequence motif CaaX, where a = an aliphatic amino acid and X = any amino acid. Lipid binding is essential for membrane attachment, a key feature of most Ras proteins. Due to the presence of truncated sequences in this CD, the lipid modification site is not available for annotation. Pssm-ID: 206642 [Multi-domain] Cd Length: 160 Bit Score: 37.12 E-value: 4.59e-03
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| Rab | cd00154 | Ras-related in brain (Rab) family of small guanosine triphosphatases (GTPases); Rab GTPases ... |
9-136 | 4.81e-03 | |||||
Ras-related in brain (Rab) family of small guanosine triphosphatases (GTPases); Rab GTPases form the largest family within the Ras superfamily. There are at least 60 Rab genes in the human genome, and a number of Rab GTPases are conserved from yeast to humans. Rab GTPases are small, monomeric proteins that function as molecular switches to regulate vesicle trafficking pathways. The different Rab GTPases are localized to the cytosolic face of specific intracellular membranes, where they regulate distinct steps in membrane traffic pathways. In the GTP-bound form, Rab GTPases recruit specific sets of effector proteins onto membranes. Through their effectors, Rab GTPases regulate vesicle formation, actin- and tubulin-dependent vesicle movement, and membrane fusion. GTPase activating proteins (GAPs) interact with GTP-bound Rab and accelerate the hydrolysis of GTP to GDP. Guanine nucleotide exchange factors (GEFs) interact with GDP-bound Rabs to promote the formation of the GTP-bound state. Rabs are further regulated by guanine nucleotide dissociation inhibitors (GDIs), which mask C-terminal lipid binding and promote cytosolic localization. While most unicellular organisms possess 5-20 Rab members, several have been found to possess 60 or more Rabs; for many of these Rab isoforms, homologous proteins are not found in other organisms. Most Rab GTPases contain a lipid modification site at the C-terminus, with sequence motifs CC, CXC, or CCX. Lipid binding is essential for membrane attachment, a key feature of most Rab proteins. Since crystal structures often lack C-terminal residues, the lipid modification site is not available for annotation in many of the CDs in the hierarchy, but is included where possible. Pssm-ID: 206640 [Multi-domain] Cd Length: 159 Bit Score: 37.05 E-value: 4.81e-03
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| RocCOR | cd09914 | Ras of complex proteins (Roc) C-terminal of Roc (COR) domain family; RocCOR (or Roco) protein ... |
9-156 | 5.80e-03 | |||||
Ras of complex proteins (Roc) C-terminal of Roc (COR) domain family; RocCOR (or Roco) protein family is characterized by a superdomain containing a Ras-like GTPase domain, called Roc (Ras of complex proteins), and a characteristic second domain called COR (C-terminal of Roc). A kinase domain and diverse regulatory domains are also often found in Roco proteins. Their functions are diverse; in Dictyostelium discoideum, which encodes 11 Roco proteins, they are involved in cell division, chemotaxis and development, while in human, where 4 Roco proteins (LRRK1, LRRK2, DAPK1, and MFHAS1) are encoded, these proteins are involved in epilepsy and cancer. Mutations in LRRK2 (leucine-rich repeat kinase 2) are known to cause familial Parkinson's disease. Pssm-ID: 206741 [Multi-domain] Cd Length: 161 Bit Score: 36.93 E-value: 5.80e-03
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| Rho4_like | cd04132 | Ras homology family 4 (Rho4) of small guanosine triphosphatases (GTPases)-like; Rho4 is a ... |
7-97 | 8.46e-03 | |||||
Ras homology family 4 (Rho4) of small guanosine triphosphatases (GTPases)-like; Rho4 is a GTPase that controls septum degradation by regulating secretion of Eng1 or Agn1 during cytokinesis. Rho4 also plays a role in cell morphogenesis. Rho4 regulates septation and cell morphology by controlling the actin cytoskeleton and cytoplasmic microtubules. The localization of Rho4 is modulated by Rdi1, which may function as a GDI, and by Rga9, which is believed to function as a GAP. In S. pombe, both Rho4 deletion and Rho4 overexpression result in a defective cell wall, suggesting a role for Rho4 in maintaining cell wall integrity. Most Rho proteins contain a lipid modification site at the C-terminus, with a typical sequence motif CaaX, where a = an aliphatic amino acid and X = any amino acid. Lipid binding is essential for membrane attachment, a key feature of most Rho proteins. Pssm-ID: 206704 [Multi-domain] Cd Length: 197 Bit Score: 36.94 E-value: 8.46e-03
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| Rab36_Rab34 | cd04108 | Rab GTPase families 34 (Rab34) and 36 (Rab36); Rab34/Rab36 subfamily. Rab34, found primarily ... |
9-156 | 8.56e-03 | |||||
Rab GTPase families 34 (Rab34) and 36 (Rab36); Rab34/Rab36 subfamily. Rab34, found primarily in the Golgi, interacts with its effector, Rab-interacting lysosomal protein (RILP). This enables its participation in microtubular dynenin-dynactin-mediated repositioning of lysosomes from the cell periphery to the Golgi. A Rab34 (Rah) isoform that lacks the consensus GTP-binding region has been identified in mice. This isoform is associated with membrane ruffles and promotes macropinosome formation. Rab36 has been mapped to human chromosome 22q11.2, a region that is homozygously deleted in malignant rhabdoid tumors (MRTs). However, experimental assessments do not implicate Rab36 as a tumor suppressor that would enable tumor formation through a loss-of-function mechanism. GTPase activating proteins (GAPs) interact with GTP-bound Rab and accelerate the hydrolysis of GTP to GDP. Guanine nucleotide exchange factors (GEFs) interact with GDP-bound Rabs to promote the formation of the GTP-bound state. Rabs are further regulated by guanine nucleotide dissociation inhibitors (GDIs), which facilitate Rab recycling by masking C-terminal lipid binding and promoting cytosolic localization. Most Rab GTPases contain a lipid modification site at the C-terminus, with sequence motifs CC, CXC, or CCX. Lipid binding is essential for membrane attachment, a key feature of most Rab proteins. Pssm-ID: 206693 [Multi-domain] Cd Length: 170 Bit Score: 36.39 E-value: 8.56e-03
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| Rab23_like | cd04106 | Rab GTPase family 23 (Rab23)-like; Rab23-like subfamily. Rab23 is a member of the Rab family ... |
9-167 | 9.68e-03 | |||||
Rab GTPase family 23 (Rab23)-like; Rab23-like subfamily. Rab23 is a member of the Rab family of small GTPases. In mouse, Rab23 has been shown to function as a negative regulator in the sonic hedgehog (Shh) signaling pathway. Rab23 mediates the activity of Gli2 and Gli3, transcription factors that regulate Shh signaling in the spinal cord, primarily by preventing Gli2 activation in the absence of Shh ligand. Rab23 also regulates a step in the cytoplasmic signal transduction pathway that mediates the effect of Smoothened (one of two integral membrane proteins that are essential components of the Shh signaling pathway in vertebrates). In humans, Rab23 is expressed in the retina. Mice contain an isoform that shares 93% sequence identity with the human Rab23 and an alternative splicing isoform that is specific to the brain. This isoform causes the murine open brain phenotype, indicating it may have a role in the development of the central nervous system. GTPase activating proteins (GAPs) interact with GTP-bound Rab and accelerate the hydrolysis of GTP to GDP. Guanine nucleotide exchange factors (GEFs) interact with GDP-bound Rabs to promote the formation of the GTP-bound state. Rabs are further regulated by guanine nucleotide dissociation inhibitors (GDIs), which facilitate Rab recycling by masking C-terminal lipid binding and promoting cytosolic localization. Most Rab GTPases contain a lipid modification site at the C-terminus, with sequence motifs CC, CXC, or CCX. Lipid binding is essential for membrane attachment, a key feature of most Rab proteins. Due to the presence of truncated sequences in this CD, the lipid modification site is not available for annotation. Pssm-ID: 133306 [Multi-domain] Cd Length: 162 Bit Score: 36.27 E-value: 9.68e-03
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