RAS p21 protein activator 1

RAS p21 protein activator (GTPase activating protein) 1
PDB rendering based on 1wer.
Available structures PDB Ortholog search: PDBe, RCSB List of PDB id codes 1WER​, 1WQ1​, 2GQI​, 2GSB​, 2J05​, 2J06​, 2M51​, 4FSS​
Identifiers
Symbols	RASA1 ; CM-AVM; CMAVM; GAP; PKWS; RASA; RASGAP; p120GAP; p120RASGAP
External IDs	OMIM: 139150 MGI: 97860 HomoloGene: 2168 GeneCards: RASA1 Gene
Gene ontology Molecular function • glycoprotein binding • GTPase activator activity • receptor binding • protein binding • potassium channel inhibitor activity • GTPase binding Cellular component • ruffle • cytoplasm • cytosol • intrinsic component of the cytoplasmic side of the plasma membrane Biological process • mitotic cytokinesis • vasculogenesis • negative regulation of cell-matrix adhesion • negative regulation of cell adhesion • signal transduction • axon guidance • regulation of cell shape • embryo development • regulation of actin filament polymerization • intracellular signal transduction • negative regulation of neuron apoptotic process • positive regulation of GTPase activity • negative regulation of Ras protein signal transduction • vascular endothelial growth factor receptor signaling pathway • ephrin receptor signaling pathway • blood vessel morphogenesis • regulation of RNA metabolic process Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	5921	218397
Ensembl	ENSG00000145715	ENSMUSG00000021549
UniProt	P20936	E9PYG6
RefSeq (mRNA)	NM_002890	NM_145452
RefSeq (protein)	NP_002881	NP_663427
Location (UCSC)	Chr 5: 87.27 – 87.39 Mb	Chr 13: 85.21 – 85.29 Mb
PubMed search

RAS p21 protein activator 1 or RasGAP (Ras GTPase activating protein), also known as RASA1, is a 120-kDa cytosolic human protein that provides two principal activities:

• Inactivation of Ras from its active GTP-bound form to its inactive GDP-bound form by enhancing the endogenous GTPase activity of Ras, via its C-terminal GAP domain
• Mitogenic signal transmission towards downstream interacting partners through its N-terminal SH2-SH3-SH2 domains

The protein encoded by this gene is located in the cytoplasm and is part of the GAP1 family of GTPase-activating proteins. The gene product stimulates the GTPase activity of normal RAS p21 but not its oncogenic counterpart. Acting as a suppressor of RAS function, the protein enhances the weak intrinsic GTPase activity of RAS proteins resulting in the inactive GDP-bound form of RAS, thereby allowing control of cellular proliferation and differentiation. Mutations leading to changes in the binding sites of either protein are associated with basal cell carcinomas. Alternative splicing results in two isoforms where the shorter isoform, lacking the N-terminal hydrophobic region but retaining the same activity, appears to be abundantly expressed in placental but not adult tissues.^[1]

Domains

RasGAP contains one SH3 domain and two SH2 domains, a PH domain, and a GAP domain.

Interactions

RAS p21 protein activator 1 has been shown to interact with:

• ANXA6,^[2]
• CAV2,^[3]
• DNAJA3,^[4]
• DOK1,^[5][6][7]
• EPHB2,^[8][9]
• EPHB3,^[10]
• GNB2L1 ^[11]
• HCK,^[12]
• HRAS,^[13][14][15]
• HTT,^[16]
• IGF1R,^[17]
• KHDRBS1,^[18][19][20]
• NCK1,^[21]
• PDGFRB,^[22][23]
• PTK2B,^[24][25]
• SOCS3,^[26] and
• Src.^[13][27]

The mRNA can interact with Mir-132 microRNA; this process is linked to angiogenesis.^[28]

Disease Database

RASA1 gene variant database

References

1. "Entrez Gene: RASA1 RAS p21 protein activator (GTPase activating protein) 1".
2. Chow A, Gawler D (October 1999). "Mapping the site of interaction between annexin VI and the p120GAP C2 domain". FEBS Lett. 460 (1): 166–72. doi:10.1016/s0014-5793(99)01336-8. PMID 10571081.
3. Lee H, Park DS, Wang XB, Scherer PE, Schwartz PE, Lisanti MP (September 2002). "Src-induced phosphorylation of caveolin-2 on tyrosine 19. Phospho-caveolin-2 (Tyr(P)19) is localized near focal adhesions, remains associated with lipid rafts/caveolae, but no longer forms a high molecular mass hetero-oligomer with caveolin-1". J. Biol. Chem. 277 (37): 34556–67. doi:10.1074/jbc.M204367200. PMID 12091389.
4. Trentin GA, Yin X, Tahir S, Lhotak S, Farhang-Fallah J, Li Y, Rozakis-Adcock M (April 2001). "A mouse homologue of the Drosophila tumor suppressor l(2)tid gene defines a novel Ras GTPase-activating protein (RasGAP)-binding protein". J. Biol. Chem. 276 (16): 13087–95. doi:10.1074/jbc.M009267200. PMID 11116152.
5. Dunant NM, Wisniewski D, Strife A, Clarkson B, Resh MD (May 2000). "The phosphatidylinositol polyphosphate 5-phosphatase SHIP1 associates with the dok1 phosphoprotein in bcr-Abl transformed cells". Cell. Signal. 12 (5): 317–26. doi:10.1016/s0898-6568(00)00073-5. PMID 10822173.
6. Yamanashi Y, Baltimore D (January 1997). "Identification of the Abl- and rasGAP-associated 62 kDa protein as a docking protein, Dok". Cell 88 (2): 205–11. doi:10.1016/s0092-8674(00)81841-3. PMID 9008161.
7. Némorin JG, Duplay P (May 2000). "Evidence that Llck-mediated phosphorylation of p56dok and p62dok may play a role in CD2 signaling". J. Biol. Chem. 275 (19): 14590–7. doi:10.1074/jbc.275.19.14590. PMID 10799545.
8. Holland SJ, Gale NW, Gish GD, Roth RA, Songyang Z, Cantley LC, Henkemeyer M, Yancopoulos GD, Pawson T (July 1997). "Juxtamembrane tyrosine residues couple the Eph family receptor EphB2/Nuk to specific SH2 domain proteins in neuronal cells". EMBO J. 16 (13): 3877–88. doi:10.1093/emboj/16.13.3877. PMC 1170012. PMID 9233798.
9. Zisch AH, Pazzagli C, Freeman AL, Schneller M, Hadman M, Smith JW, Ruoslahti E, Pasquale EB (January 2000). "Replacing two conserved tyrosines of the EphB2 receptor with glutamic acid prevents binding of SH2 domains without abrogating kinase activity and biological responses". Oncogene 19 (2): 177–87. doi:10.1038/sj.onc.1203304. PMID 10644995.
10. Hock B, Böhme B, Karn T, Feller S, Rübsamen-Waigmann H, Strebhardt K (July 1998). "Tyrosine-614, the major autophosphorylation site of the receptor tyrosine kinase HEK2, functions as multi-docking site for SH2-domain mediated interactions". Oncogene 17 (2): 255–60. doi:10.1038/sj.onc.1201907. PMID 9674711.
11. Koehler JA, Moran MF (May 2001). "RACK1, a protein kinase C scaffolding protein, interacts with the PH domain of p120GAP". Biochem. Biophys. Res. Commun. 283 (4): 888–95. doi:10.1006/bbrc.2001.4889. PMID 11350068.
12. Briggs SD, Bryant SS, Jove R, Sanderson SD, Smithgall TE (June 1995). "The Ras GTPase-activating protein (GAP) is an SH3 domain-binding protein and substrate for the Src-related tyrosine kinase, Hck". J. Biol. Chem. 270 (24): 14718–24. doi:10.1074/jbc.270.24.14718. PMID 7782336.
13. Giglione C, Gonfloni S, Parmeggiani A (June 2001). "Differential actions of p60c-Src and Lck kinases on the Ras regulators p120-GAP and GDP/GTP exchange factor CDC25Mm". Eur. J. Biochem. 268 (11): 3275–83. doi:10.1046/j.1432-1327.2001.02230.x. PMID 11389730.
14. Molloy DP, Owen D, Grand RJ (July 1995). "Ras binding to a C-terminal region of GAP". FEBS Lett. 368 (2): 297–303. doi:10.1016/0014-5793(95)00657-u. PMID 7628625.
15. Sprang SR (July 1997). "GAP into the breach". Science 277 (5324): 329–30. doi:10.1126/science.277.5324.329. PMID 9518363.
16. Liu YF, Deth RC, Devys D (March 1997). "SH3 domain-dependent association of huntingtin with epidermal growth factor receptor signaling complexes". J. Biol. Chem. 272 (13): 8121–4. doi:10.1074/jbc.272.13.8121. PMID 9079622.
17. Seely BL, Reichart DR, Staubs PA, Jhun BH, Hsu D, Maegawa H, Milarski KL, Saltiel AR, Olefsky JM (August 1995). "Localization of the insulin-like growth factor I receptor binding sites for the SH2 domain proteins p85, Syp, and GTPase activating protein". J. Biol. Chem. 270 (32): 19151–7. doi:10.1074/jbc.270.32.19151. PMID 7642582.
18. Sánchez-Margalet V, Najib S (October 2001). "Sam68 is a docking protein linking GAP and PI3K in insulin receptor signaling". Mol. Cell. Endocrinol. 183 (1-2): 113–21. doi:10.1016/s0303-7207(01)00587-1. PMID 11604231.
19. Jabado N, Jauliac S, Pallier A, Bernard F, Fischer A, Hivroz C (September 1998). "Sam68 association with p120GAP in CD4+ T cells is dependent on CD4 molecule expression". J. Immunol. 161 (6): 2798–803. PMID 9743338.
20. Koch CA, Moran MF, Anderson D, Liu XQ, Mbamalu G, Pawson T (March 1992). "Multiple SH2-mediated interactions in v-src-transformed cells". Mol. Cell. Biol. 12 (3): 1366–74. doi:10.1128/mcb.12.3.1366. PMC 369570. PMID 1545818.
21. Ger M, Zitkus Z, Valius M (October 2011). "Adaptor protein Nck1 interacts with p120 Ras GTPase-activating protein and regulates its activity". Cell. Signal. 23 (10): 1651–8. doi:10.1016/j.cellsig.2011.05.019. PMID 21664272.
22. Farooqui T, Kelley T, Coggeshall KM, Rampersaud AA, Yates AJ (1999). "GM1 inhibits early signaling events mediated by PDGF receptor in cultured human glioma cells". Anticancer Res. 19 (6B): 5007–13. PMID 10697503.
23. Ekman S, Kallin A, Engström U, Heldin CH, Rönnstrand L (March 2002). "SHP-2 is involved in heterodimer specific loss of phosphorylation of Tyr771 in the PDGF beta-receptor". Oncogene 21 (12): 1870–5. doi:10.1038/sj.onc.1205210. PMID 11896619.
24. Chow A, Davis AJ, Gawler DJ (March 2000). "Identification of a novel protein complex containing annexin VI, Fyn, Pyk2, and the p120(GAP) C2 domain". FEBS Lett. 469 (1): 88–92. doi:10.1016/s0014-5793(00)01252-7. PMID 10708762.
25. Zrihan-Licht S, Fu Y, Settleman J, Schinkmann K, Shaw L, Keydar I, Avraham S, Avraham H (March 2000). "RAFTK/Pyk2 tyrosine kinase mediates the association of p190 RhoGAP with RasGAP and is involved in breast cancer cell invasion". Oncogene 19 (10): 1318–28. doi:10.1038/sj.onc.1203422. PMID 10713673.
26. Cacalano NA, Sanden D, Johnston JA (May 2001). "Tyrosine-phosphorylated SOCS-3 inhibits STAT activation but binds to p120 RasGAP and activates Ras". Nat. Cell Biol. 3 (5): 460–5. doi:10.1038/35074525. PMID 11331873.
27. Brott BK, Decker S, O'Brien MC, Jove R (October 1991). "Molecular features of the viral and cellular Src kinases involved in interactions with the GTPase-activating protein". Mol. Cell. Biol. 11 (10): 5059–67. doi:10.1128/mcb.11.10.5059. PMC 361505. PMID 1717825.
28. Anand S, Majeti BK, Acevedo LM, Murphy EA, Mukthavaram R, Scheppke L, Huang M, Shields DJ, Lindquist JN, Lapinski PE, King PD, Weis SM, Cheresh DA (2010). "MicroRNA-132–mediated loss of p120RasGAP activates the endothelium to facilitate pathological angiogenesis". Nat Med 16 (8): 909–14. doi:10.1038/nm.2186. PMC 3094020. PMID 20676106.

External links

• GeneReviews/NCBI/NIH/UW entry on Capillary Malformation-Arteriovenous Malformation Syndrome and RASA1-Related Parkes Weber Syndrome
• OMIM entries in RASA1 related disorders

Further reading

• Tocque B, Delumeau I, Parker F, et al. (1997). "Ras-GTPase activating protein (GAP): a putative effector for Ras". Cell. Signal. 9 (2): 153–8. doi:10.1016/S0898-6568(96)00135-0. PMID 9113414.
• Boon LM, Mulliken JB, Vikkula M (2005). "RASA1: variable phenotype with capillary and arteriovenous malformations". Curr. Opin. Genet. Dev. 15 (3): 265–9. doi:10.1016/j.gde.2005.03.004. PMID 15917201.