RAC1

Ras-related C3 botulinum toxin substrate 1 (rho family, small GTP binding protein Rac1)
PDB rendering based on 1ds6.
Available structures PDB Ortholog search: PDBe, RCSB List of PDB id codes 1E96​, 1FOE​, 1G4U​, 1HE1​, 1HH4​, 1I4D​, 1I4L​, 1I4T​, 1MH1​, 1RYF​, 1RYH​, 2FJU​, 2H7V​, 2NZ8​, 2P2L​, 2RMK​, 2VRW​, 2WKP​, 2WKQ​, 2WKR​, 2YIN​, 3B13​, 3BJI​, 3RYT​, 3SBD​, 3SBE​, 3SU8​, 3SUA​, 3TH5​, 4GZL​, 4GZM​
Identifiers
Symbols	RAC1 ; MIG5; Rac-1; TC-25; p21-Rac1
External IDs	OMIM: 602048 MGI: 97845 HomoloGene: 69035 ChEMBL: 6094 GeneCards: RAC1 Gene
Gene ontology Molecular function • GTPase activity • protein binding • GTP binding • enzyme binding • GTP-dependent protein binding • thioesterase binding • Rho GDP-dissociation inhibitor binding Cellular component • phagocytic cup • nucleus • cytoplasm • endoplasmic reticulum membrane • trans-Golgi network • cytosol • actin filament • plasma membrane • focal adhesion • membrane • extrinsic component of plasma membrane • lamellipodium • early endosome membrane • ruffle membrane • cytoplasmic ribonucleoprotein granule • melanosome • extracellular exosome Biological process • positive regulation of protein phosphorylation • auditory receptor cell morphogenesis • epithelial cell morphogenesis • movement of cell or subcellular component • inflammatory response • hyperosmotic response • cell adhesion • cell-matrix adhesion • G-protein coupled receptor signaling pathway • small GTPase mediated signal transduction • axon guidance • blood coagulation • metabolic process • regulation of cell size • response to wounding • anatomical structure morphogenesis • regulation of hydrogen peroxide metabolic process • positive regulation of lamellipodium assembly • regulation of fibroblast migration • positive regulation of cell-substrate adhesion • regulation of neuron maturation • viral process • cerebral cortex radially oriented cell migration • embryonic olfactory bulb interneuron precursor migration • cerebral cortex GABAergic interneuron development • lamellipodium assembly • actin cytoskeleton organization • actin filament polymerization • platelet activation • regulation of cell migration • positive regulation of actin filament polymerization • T cell costimulation • ruffle organization • negative regulation of interleukin-23 production • substrate adhesion-dependent cell spreading • positive regulation of Rho protein signal transduction • intracellular signal transduction • Fc-epsilon receptor signaling pathway • Fc-gamma receptor signaling pathway involved in phagocytosis • positive regulation of apoptotic process • positive regulation of phosphatidylinositol 3-kinase activity • engulfment of apoptotic cell • innate immune response • cell-cell junction organization • vascular endothelial growth factor receptor signaling pathway • neurotrophin TRK receptor signaling pathway • ephrin receptor signaling pathway • negative regulation of receptor-mediated endocytosis • anatomical structure arrangement • dendrite morphogenesis • cell motility • homeostasis of number of cells within a tissue • regulation of defense response to virus by virus • regulation of small GTPase mediated signal transduction • positive regulation of stress fiber assembly • localization within membrane • positive regulation of focal adhesion assembly • synaptic transmission, GABAergic • Wnt signaling pathway, planar cell polarity pathway • regulation of respiratory burst • semaphorin-plexin signaling pathway • dopaminergic neuron differentiation • protein localization to plasma membrane • positive regulation of neutrophil chemotaxis • cochlea morphogenesis • ruffle assembly • apoptotic signaling pathway • positive regulation of substrate adhesion-dependent cell spreading Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	5879	19353
Ensembl	ENSG00000136238	ENSMUSG00000001847
UniProt	P63000	P63001
RefSeq (mRNA)	NM_006908	NM_009007
RefSeq (protein)	NP_008839	NP_033033
Location (UCSC)	Chr 7: 6.37 – 6.4 Mb	Chr 5: 143.5 – 143.53 Mb
PubMed search

Rac1, also known as Ras-related C3 botulinum toxin substrate 1, is a protein found in human cells. It is encoded by the RAC1 gene.^[1][2] This gene can produce a variety of alternatively spliced versions of the Rac1 protein, which appear to carry out different functions.^[3]

Function

Rac1 is a small (~21 kDa) signaling G protein (more specifically a GTPase), and is a member of the Rac subfamily of the family Rho family of GTPases. Members of this superfamily appear to regulate a diverse array of cellular events, including the control of GLUT4^[4][5] translocation to glucose uptake, cell growth, cytoskeletal reorganization, and the activation of protein kinases.^[6]

Rac1 is a pleiotropic regulator of many cellular processes, including the cell cycle, cell-cell adhesion, motility (through the actin network), and of epithelial differentiation (proposed to be necessary for maintaining epidermal stem cells).

Role in cancer

Along with other subfamily of Rac and Rho proteins, they exert an important regulatory role specifically in cell motility and cell growth. Rac1 has ubiquitous tissue expression, and drives cell motility by formation of lamellipodia.^[7] In order for cancer cells to grow and invade local and distant tissues, deregulation of cell motility is one of the hallmark events in cancer cell invasion and metastasis.^[8] Activating or gain-of-function mutations of Rac1 are shown to play active roles in promoting mesenchymal-type of cell movement assisted by NEDD9 and DOCK3 protein complex.^[9] Such abnormal cell motility may result in epithelial mesenchymal transition (EMT) – a driving mechanism for tumor metastasis as well as drug-resistant tumor relapse.^[10][11]

Role in glucose transport

Rac1 is expressed in significant amounts in insulin sensitive tissues, such as adipose tissue and skeletal muscle. Here Rac1 regulated the translocation of glucose transporting GLUT4 vesicles from intracellular compartments to the plasma membrane.^[12][13][5] In response to insulin, this allows for blood glucose to enter the cell to lower blood glucose. In conditions of obesity and type 2 diabetes, Rac1 signaling in skeletal muscle is dysfunctional, suggesting that Rac1 contributes to the progression of the disease. Rac1 protein is also necessary for glucose uptake in skeletal muscle activated by exercise^[14][4] and muscle stretching^[15]

Clinical significance

Activating mutations in Rac1 have been recently discovered in large-scale genomic studies involving melanoma ^[16][17][18] and non-small cell lung cancer.^[19] As a result, Rac1 is considered a therapeutic target for many of these diseases.^[20]

A few recent studies have also exploited targeted therapy to suppress tumor growth by pharmacological inhibition of Rac1 activity in metastatic melanoma and liver cancer as well as in human breast cancer.^[21][22][23] For example, Rac1-dependent pathway inhibition resulted in the reversal of tumor cell phenotypes, suggesting Rac1 as a predictive marker and therapeutic target for trastuzumab-resistant breast cancer.^[22] However, given Rac1's role in glucose transport, drugs that inhibits Rac1 could potentially be harmful to glucose homeostasis.

Interactions

RAC1 has been shown to interact with:

• ARFIP2,^[24][25][26]
• ARHGDIA,^{[27][28][29][30][31][32]}
• BAIAP2,^[33]
• FHOD1,^[34]
• FMNL1,^[35]
• IQGAP1,^{[36][37][38][39]}
• IQGAP2,^[40]
• Myd88,^[41]
• DMPK,^[42]
• NCKAP1,^[43]
• PAK1,^[36][44][45]
• PAK3,^[24]
• PARD6A,^[46][47]
• PARD6B,^[46]
• RICS^[48][49]
• STAT3,^[50] and
• TIAM1.^[51][52]

References

1. Didsbury J, Weber RF, Bokoch GM, Evans T, Snyderman R (Oct 1989). "rac, a novel ras-related family of proteins that are botulinum toxin substrates". The Journal of Biological Chemistry 264 (28): 16378–82. PMID 2674130.
2. Jordan P, Brazåo R, Boavida MG, Gespach C, Chastre E (Nov 1999). "Cloning of a novel human Rac1b splice variant with increased expression in colorectal tumors". Oncogene 18 (48): 6835–9. doi:10.1038/sj.onc.1203233. PMID 10597294.
3. Zhou C, Licciulli S, Avila JL, Cho M, Troutman S, Jiang P, Kossenkov AV, Showe LC, Liu Q, Vachani A, Albelda SM, Kissil JL (Feb 2013). "The Rac1 splice form Rac1b promotes K-ras-induced lung tumorigenesis". Oncogene 32 (7): 903–9. doi:10.1038/onc.2012.99. PMC 3384754. PMID 22430205.
4. Sylow, Lykke; Nielsen, Ida L.; Kleinert, Maximilian; Møller, Lisbeth L. V.; Ploug, Thorkil; Schjerling, Peter; Bilan, Philip J.; Klip, Amira; Jensen, Thomas E. (2016-04-09). "Rac1 governs exercise-stimulated glucose uptake in skeletal muscle through regulation of GLUT4 translocation in mice". The Journal of Physiology. doi:10.1113/JP272039. ISSN 1469-7793. PMID 27061726.
5. Ueda S, Kitazawa S, Ishida K, Nishikawa Y, Matsui M, Matsumoto H, Aoki T, Nozaki S, Takeda T, Tamori Y, Aiba A, Kahn CR, Kataoka T, Satoh T (Jul 2010). "Crucial role of the small GTPase Rac1 in insulin-stimulated translocation of glucose transporter 4 to the mouse skeletal muscle sarcolemma". FASEB Journal 24 (7): 2254–61. doi:10.1096/fj.09-137380. PMC 4183928. PMID 20203090.
6. Ridley AJ (Oct 2006). "Rho GTPases and actin dynamics in membrane protrusions and vesicle trafficking". Trends in Cell Biology 16 (10): 522–9. doi:10.1016/j.tcb.2006.08.006. PMID 16949823.
7. Parri M, Chiarugi P (2010). "Rac and Rho GTPases in cancer cell motility control". Cell Communication and Signaling 8 (23): 23. doi:10.1186/1478-811x-8-23.
8. Hanahan D, Weinberg RA (Mar 2011). "Hallmarks of cancer: the next generation". Cell 144 (5): 646–74. doi:10.1016/j.cell.2011.02.013. PMID 21376230.
9. Sanz-Moreno V, Gadea G, Ahn J, Paterson H, Marra P, Pinner S, Sahai E, Marshall CJ (Oct 2008). "Rac activation and inactivation control plasticity of tumor cell movement". Cell 135 (3): 510–23. doi:10.1016/j.cell.2008.09.043. PMID 18984162.
10. Stallings-Mann ML, Waldmann J, Zhang Y, Miller E, Gauthier ML, Visscher DW, et al. (Jul 11, 2012). "Matrix metalloproteinase induction of Rac1b, a key effector of lung cancer progression.". Science translational medicine. 4 (142): 510–523.
11. Yang WH, Lan HY, Huang CH, Tai SK, Tzeng CH, Kao SY, Wu KJ, Hung MC, Yang MH (Apr 2012). "RAC1 activation mediates Twist1-induced cancer cell migration". Nature Cell Biology 14 (4): 366–74. doi:10.1038/ncb2455.
12. Sylow L, Kleinert M, Pehmøller C, Prats C, Chiu TT, Klip A, Richter EA, Jensen TE (Feb 2014). "Akt and Rac1 signaling are jointly required for insulin-stimulated glucose uptake in skeletal muscle and downregulated in insulin resistance". Cellular Signalling 26 (2): 323–31. doi:10.1016/j.cellsig.2013.11.007. PMID 24216610.
13. Sylow L, Jensen TE, Kleinert M, Højlund K, Kiens B, Wojtaszewski J, Prats C, Schjerling P, Richter EA (Jun 2013). "Rac1 signaling is required for insulin-stimulated glucose uptake and is dysregulated in insulin-resistant murine and human skeletal muscle". Diabetes 62 (6): 1865–75. doi:10.2337/db12-1148. PMC 3661612. PMID 23423567.
14. Sylow L, Jensen TE, Kleinert M, Mouatt JR, Maarbjerg SJ, Jeppesen J, Prats C, Chiu TT, Boguslavsky S, Klip A, Schjerling P, Richter EA (Apr 2013). "Rac1 is a novel regulator of contraction-stimulated glucose uptake in skeletal muscle". Diabetes 62 (4): 1139–51. doi:10.2337/db12-0491. PMC 3609592. PMID 23274900.
15. Sylow L, Møller LL, Kleinert M, Richter EA, Jensen TE (Feb 2015). "Stretch-stimulated glucose transport in skeletal muscle is regulated by Rac1". The Journal of Physiology 593 (3): 645–56. doi:10.1113/jphysiol.2014.284281. PMC 4324711. PMID 25416624.
16. Hodis E, Watson IR, Kryukov GV, Arold ST, Imielinski M, Theurillat JP, Nickerson E, Auclair D, Li L, Place C, Dicara D, Ramos AH, Lawrence MS, Cibulskis K, Sivachenko A, Voet D, Saksena G, Stransky N, Onofrio RC, Winckler W, Ardlie K, Wagle N, Wargo J, Chong K, Morton DL, Stemke-Hale K, Chen G, Noble M, Meyerson M, Ladbury JE, Davies MA, Gershenwald JE, Wagner SN, Hoon DS, Schadendorf D, Lander ES, Gabriel SB, Getz G, Garraway LA, Chin L (Jul 2012). "A landscape of driver mutations in melanoma". Cell 150 (2): 251–63. doi:10.1016/j.cell.2012.06.024. PMC 3600117. PMID 22817889.
17. Krauthammer M, Kong Y, Ha BH, Evans P, Bacchiocchi A, McCusker JP, Cheng E, Davis MJ, Goh G, Choi M, Ariyan S, Narayan D, Dutton-Regester K, Capatana A, Holman EC, Bosenberg M, Sznol M, Kluger HM, Brash DE, Stern DF, Materin MA, Lo RS, Mane S, Ma S, Kidd KK, Hayward NK, Lifton RP, Schlessinger J, Boggon TJ, Halaban R (Sep 2012). "Exome sequencing identifies recurrent somatic RAC1 mutations in melanoma". Nature Genetics 44 (9): 1006–14. doi:10.1038/ng.2359. PMC 3432702. PMID 22842228.
18. Bauer NN, Chen YW, Samant RS, Shevde LA, Fodstad O (Nov 2007). "Rac1 activity regulates proliferation of aggressive metastatic melanoma". Experimental Cell Research 313 (18): 3832–9. doi:10.1016/j.yexcr.2007.08.017. PMID 17904119.
19. Stallings-Mann ML, Waldmann J, Zhang Y, Miller E, Gauthier ML, Visscher DW, Downey GP, Radisky ES, Fields AP, Radisky DC (Jul 2012). "Matrix metalloproteinase induction of Rac1b, a key effector of lung cancer progression". Science Translational Medicine 4 (142): 142ra95. doi:10.1126/scitranslmed.3004062. PMC 3733503. PMID 22786680.
20. McAllister SS (Jul 2012). "Got a light? Illuminating lung cancer". Science Translational Medicine 4 (142): 142fs22. doi:10.1126/scitranslmed.3004446. PMID 22786678.
21. Chen QY, Xu LQ, Jiao DM, Yao QH, Wang YY, Hu HZ, et al. (Nov 2011). "Silencing of Rac1 modifies lung cancer cell migration, invasion and actin cytoskeleton rearrangements and enhances chemosensitivity to antitumor drugs.". International journal of molecular medicine 28 (5): 769–776.
22. Dokmanovic M, Hirsch DS, Shen Y, Wu WJ (Jun 2009). "Rac1 contributes to trastuzumab resistance of breast cancer cells: Rac1 as a potential therapeutic target for the treatment of trastuzumab-resistant breast cancer". Molecular Cancer Therapeutics 8 (6): 1557–69. doi:10.1158/1535-7163.mct-09-0140.
23. Liu S, Yu M, He Y, Xiao L, Wang F, Song C, Sun S, Ling C, Xu Z (Jun 2008). "Melittin prevents liver cancer cell metastasis through inhibition of the Rac1-dependent pathway". Hepatology 47 (6): 1964–73. doi:10.1002/hep.22240.
24. Shin OH, Exton JH (Aug 2001). "Differential binding of arfaptin 2/POR1 to ADP-ribosylation factors and Rac1". Biochemical and Biophysical Research Communications 285 (5): 1267–73. doi:10.1006/bbrc.2001.5330. PMID 11478794.
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26. Tarricone C, Xiao B, Justin N, Walker PA, Rittinger K, Gamblin SJ, Smerdon SJ (May 2001). "The structural basis of Arfaptin-mediated cross-talk between Rac and Arf signalling pathways". Nature 411 (6834): 215–9. doi:10.1038/35075620. PMID 11346801.
27. Ewing RM, Chu P, Elisma F, Li H, Taylor P, Climie S, McBroom-Cerajewski L, Robinson MD, O'Connor L, Li M, Taylor R, Dharsee M, Ho Y, Heilbut A, Moore L, Zhang S, Ornatsky O, Bukhman YV, Ethier M, Sheng Y, Vasilescu J, Abu-Farha M, Lambert JP, Duewel HS, Stewart II, Kuehl B, Hogue K, Colwill K, Gladwish K, Muskat B, Kinach R, Adams SL, Moran MF, Morin GB, Topaloglou T, Figeys D (2007). "Large-scale mapping of human protein-protein interactions by mass spectrometry". Molecular Systems Biology 3 (1): 89. doi:10.1038/msb4100134. PMC 1847948. PMID 17353931.
28. Grizot S, Fauré J, Fieschi F, Vignais PV, Dagher MC, Pebay-Peyroula E (Aug 2001). "Crystal structure of the Rac1-RhoGDI complex involved in nadph oxidase activation". Biochemistry 40 (34): 10007–13. doi:10.1021/bi010288k. PMID 11513578.
29. Lian LY, Barsukov I, Golovanov AP, Hawkins DI, Badii R, Sze KH, Keep NH, Bokoch GM, Roberts GC (Jan 2000). "Mapping the binding site for the GTP-binding protein Rac-1 on its inhibitor RhoGDI-1". Structure 8 (1): 47–55. doi:10.1016/S0969-2126(00)00080-0. PMID 10673424.
30. Gorvel JP, Chang TC, Boretto J, Azuma T, Chavrier P (Jan 1998). "Differential properties of D4/LyGDI versus RhoGDI: phosphorylation and rho GTPase selectivity". FEBS Letters 422 (2): 269–73. doi:10.1016/S0014-5793(98)00020-9. PMID 9490022.
31. Di-Poï N, Fauré J, Grizot S, Molnár G, Pick E, Dagher MC (Aug 2001). "Mechanism of NADPH oxidase activation by the Rac/Rho-GDI complex". Biochemistry 40 (34): 10014–22. doi:10.1021/bi010289c. PMID 11513579.
32. Fauré J, Dagher MC (May 2001). "Interactions between Rho GTPases and Rho GDP dissociation inhibitor (Rho-GDI)". Biochimie 83 (5): 409–14. doi:10.1016/S0300-9084(01)01263-9. PMID 11368848.
33. Miki H, Yamaguchi H, Suetsugu S, Takenawa T (Dec 2000). "IRSp53 is an essential intermediate between Rac and WAVE in the regulation of membrane ruffling". Nature 408 (6813): 732–5. doi:10.1038/35047107. PMID 11130076.
34. Westendorf JJ (Dec 2001). "The formin/diaphanous-related protein, FHOS, interacts with Rac1 and activates transcription from the serum response element". The Journal of Biological Chemistry 276 (49): 46453–9. doi:10.1074/jbc.M105162200. PMID 11590143.
35. Yayoshi-Yamamoto S, Taniuchi I, Watanabe T (Sep 2000). "FRL, a novel formin-related protein, binds to Rac and regulates cell motility and survival of macrophages". Molecular and Cellular Biology 20 (18): 6872–81. doi:10.1128/MCB.20.18.6872-6881.2000. PMC 86228. PMID 10958683.
36. Zhang B, Chernoff J, Zheng Y (Apr 1998). "Interaction of Rac1 with GTPase-activating proteins and putative effectors. A comparison with Cdc42 and RhoA". The Journal of Biological Chemistry 273 (15): 8776–82. doi:10.1074/jbc.273.15.8776. PMID 9535855.
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40. Brill S, Li S, Lyman CW, Church DM, Wasmuth JJ, Weissbach L, Bernards A, Snijders AJ (Sep 1996). "The Ras GTPase-activating-protein-related human protein IQGAP2 harbors a potential actin binding domain and interacts with calmodulin and Rho family GTPases". Molecular and Cellular Biology 16 (9): 4869–78. PMC 231489. PMID 8756646.
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44. Katoh H, Negishi M (Jul 2003). "RhoG activates Rac1 by direct interaction with the Dock180-binding protein Elmo". Nature 424 (6947): 461–4. doi:10.1038/nature01817. PMID 12879077.
45. Seoh ML, Ng CH, Yong J, Lim L, Leung T (Mar 2003). "ArhGAP15, a novel human RacGAP protein with GTPase binding property". FEBS Letters 539 (1-3): 131–7. doi:10.1016/S0014-5793(03)00213-8. PMID 12650940.
46. Noda Y, Takeya R, Ohno S, Naito S, Ito T, Sumimoto H (Feb 2001). "Human homologues of the Caenorhabditis elegans cell polarity protein PAR6 as an adaptor that links the small GTPases Rac and Cdc42 to atypical protein kinase C". Genes to Cells 6 (2): 107–19. doi:10.1046/j.1365-2443.2001.00404.x. PMID 11260256.
47. Qiu RG, Abo A, Steven Martin G (Jun 2000). "A human homolog of the C. elegans polarity determinant Par-6 links Rac and Cdc42 to PKCzeta signaling and cell transformation". Current Biology 10 (12): 697–707. doi:10.1016/S0960-9822(00)00535-2. PMID 10873802.
48. Zhao C, Ma H, Bossy-Wetzel E, Lipton SA, Zhang Z, Feng GS (Sep 2003). "GC-GAP, a Rho family GTPase-activating protein that interacts with signaling adapters Gab1 and Gab2". The Journal of Biological Chemistry 278 (36): 34641–53. doi:10.1074/jbc.M304594200. PMID 12819203.
49. Moon SY, Zang H, Zheng Y (Feb 2003). "Characterization of a brain-specific Rho GTPase-activating protein, p200RhoGAP". The Journal of Biological Chemistry 278 (6): 4151–9. doi:10.1074/jbc.M207789200. PMID 12454018.
50. Simon AR, Vikis HG, Stewart S, Fanburg BL, Cochran BH, Guan KL (Oct 2000). "Regulation of STAT3 by direct binding to the Rac1 GTPase". Science 290 (5489): 144–7. doi:10.1126/science.290.5489.144. PMID 11021801.
51. Worthylake DK, Rossman KL, Sondek J (Dec 2000). "Crystal structure of Rac1 in complex with the guanine nucleotide exchange region of Tiam1". Nature 408 (6813): 682–8. doi:10.1038/35047014. PMID 11130063.
52. Gao Y, Xing J, Streuli M, Leto TL, Zheng Y (Dec 2001). "Trp(56) of rac1 specifies interaction with a subset of guanine nucleotide exchange factors". The Journal of Biological Chemistry 276 (50): 47530–41. doi:10.1074/jbc.M108865200. PMID 11595749.

Further reading

• Benitah SA, Frye M, Glogauer M, Watt FM (Aug 2005). "Stem cell depletion through epidermal deletion of Rac1". Science 309 (5736): 933–5. doi:10.1126/science.1113579. PMID 16081735.
• Ramakers GJ (Apr 2002). "Rho proteins, mental retardation and the cellular basis of cognition". Trends in Neurosciences 25 (4): 191–9. doi:10.1016/S0166-2236(00)02118-4. PMID 11998687.
• Esufali S, Charames GS, Bapat B (Oct 2007). "Suppression of nuclear Wnt signaling leads to stabilization of Rac1 isoforms". FEBS Letters 581 (25): 4850–6. doi:10.1016/j.febslet.2007.09.013. PMID 17888911.

External links

• rac1 GTP-Binding Protein at the US National Library of Medicine Medical Subject Headings (MeSH)
• RAC1 Info with links in the Cell Migration Gateway