Rac1, poznat i kao Ras-srodni C3 supstrat botulinum toksina 1, je protein koji se nalazi u ljudskim ćelijama. Kodiran je genom RAC1.[5][6] Ovaj gen može proizvesti razne alternativna prerade verzija proteina Rac1, za koje se čini da imaju različite funkcije.[7]

RAC1
Dostupne strukture
PDBPretraga ortologa: PDBe RCSB
Spisak PDB ID kodova

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, 4YON, 5FI0

Identifikatori
AliasiRAC1
Vanjski ID-jeviOMIM: 602048 MGI: 97845 HomoloGene: 69035 GeneCards: RAC1
Lokacija gena (čovjek)
Hromosom 7 (čovjek)
Hrom.Hromosom 7 (čovjek)[1]
Hromosom 7 (čovjek)
Genomska lokacija za RAC1
Genomska lokacija za RAC1
Bend7p22.1Početak6,374,527 bp[1]
Kraj6,403,967 bp[1]
Lokacija gena (miš)
Hromosom 5 (miš)
Hrom.Hromosom 5 (miš)[2]
Hromosom 5 (miš)
Genomska lokacija za RAC1
Genomska lokacija za RAC1
Bend5 G2|5 82.22 cMPočetak143,489,389 bp[2]
Kraj143,513,791 bp[2]
Obrazac RNK ekspresije


Više referentnih podataka o ekspresiji
Ontologija gena
Molekularna funkcija histone deacetylase binding
Rho GDP-dissociation inhibitor binding
GTP-dependent protein binding
GO:0006184 GTPase activity
vezivanje enzima
GO:0001948, GO:0016582 vezivanje za proteine
thioesterase binding
protein kinase binding
nucleotide binding
GTP binding
protein serine/threonine kinase activity
GO:0032403 protein-containing complex binding
phosphatidylinositol-4,5-bisphosphate 3-kinase activity
ATPase binding
Ćelijska komponenta citoplazma
citosol
membrana
focal adhesion
Melanosom
ruffle membrane
trans-Golđijeva mreža
jedro
projekcija ćelije
extrinsic component of plasma membrane
Egzosom
lamellipodium
early endosome membrane
ćelijska membrana
Mikronit
cytoplasmic ribonucleoprotein granule
endoplasmic reticulum membrane
Golđijeva membrana
phagocytic cup
GO:0016023 citoplazmatska vezikula
GO:0005578 Vanćelijski matriks
secretory granule membrane
dendritična kičma
recycling endosome membrane
postsynapse
glutamatergic synapse
ficolin-1-rich granule membrane
Biološki proces positive regulation of Rho protein signal transduction
regulation of respiratory burst
non-canonical Wnt signaling pathway
positive regulation of protein phosphorylation
positive regulation of actin filament polymerization
regulation of neuron maturation
negative regulation of receptor-mediated endocytosis
platelet activation
Fc-epsilon receptor signaling pathway
cellular response to mechanical stimulus
phagocytosis, engulfment
vascular endothelial growth factor receptor signaling pathway
substrate adhesion-dependent cell spreading
Ćelijska proliferacija
ruffle assembly
lamellipodium assembly
dopaminergic neuron differentiation
cell-cell junction organization
Fc-gamma receptor signaling pathway involved in phagocytosis
ruffle organization
actin filament organization
cell motility
anatomical structure morphogenesis
bone resorption
response to wounding
protein localization to plasma membrane
inflammatory response
regulation of small GTPase mediated signal transduction
positive regulation of cell-substrate adhesion
G protein-coupled receptor signaling pathway
neuron projection morphogenesis
epithelial cell morphogenesis
dendrite morphogenesis
regulation of hydrogen peroxide metabolic process
engulfment of apoptotic cell
dendrite development
auditory receptor cell morphogenesis
hyperosmotic response
cerebral cortex GABAergic interneuron development
Hemotaksija
positive regulation of DNA replication
actin filament polymerization
Ćelijska adhezija
negative regulation of interleukin-23 production
homeostasis of number of cells within a tissue
cell-matrix adhesion
localization within membrane
actin cytoskeleton organization
regulation of cell size
anatomical structure arrangement
GO:0007243 intracellular signal transduction
regulation of cell migration
Endocitoza
ephrin receptor signaling pathway
T cell costimulation
Koagulacija (krv)
GO:0019049, GO:0030683 mitigation of host defenses by virus
synaptic transmission, GABAergic
mast cell chemotaxis
positive regulation of phosphatidylinositol 3-kinase activity
positive regulation of substrate adhesion-dependent cell spreading
embryonic olfactory bulb interneuron precursor migration
cytoskeleton organization
cochlea morphogenesis
positive regulation of neutrophil chemotaxis
positive regulation of apoptotic process
regulation of cell morphogenesis
positive regulation of focal adhesion assembly
regulation of fibroblast migration
positive regulation of lamellipodium assembly
cerebral cortex radially oriented cell migration
Ćelijska migracija
semaphorin-plexin signaling pathway
positive regulation of stress fiber assembly
axon guidance
small GTPase mediated signal transduction
GO:0032320, GO:0032321, GO:0032855, GO:0043089, GO:0032854 positive regulation of GTPase activity
Wnt signaling pathway, planar cell polarity pathway
midbrain dopaminergic neuron differentiation
neuron migration
protein phosphorylation
Rho protein signal transduction
regulation of lamellipodium assembly
Rac protein signal transduction
cell projection assembly
positive regulation of microtubule polymerization
neutrophil degranulation
regulation of nitric oxide biosynthetic process
phosphatidylinositol phosphate biosynthetic process
hepatocyte growth factor receptor signaling pathway
regulation of stress fiber assembly
positive regulation of protein kinase B signaling
motor neuron axon guidance
regulation of neutrophil migration
positive regulation of insulin secretion involved in cellular response to glucose stimulus
Izvori:Amigo / QuickGO
Ortolozi
VrsteČovjekMiš
Entrez
Ensembl
UniProt
RefSeq (mRNK)

NM_198829
NM_006908
NM_018890

NM_009007
NM_001347530

RefSeq (bjelančevina)

NP_008839
NP_061485

NP_001334459
NP_033033

Lokacija (UCSC)Chr 7: 6.37 – 6.4 MbChr 5: 143.49 – 143.51 Mb
PubMed pretraga[3][4]
Wikipodaci
Pogledaj/uredi – čovjekPogledaj/uredi – miš

Funkcija

uredi

Rac1 je mal (~ 21 kDa) signalizirajući G protein (tačnije GTPaza) i član je potporodice Rac porodice porodice Rho GTPaza. Članovi ove superporodice reguliraju raznolik niz ćelijskih događaja, uključujući kontrolu GLUT4,[8][9] translokaciju do unosa glukoze, rast ćelija, reorganizaciju citoskeleta, antimikrobnu citotoksičnost,[10] i aktivaciju protein kinaza.[11]

Rac1 je plejotropni regulator mnogih ćelijskih procesa, uključujući ćelijski ciklus, adheziju ćelijskih ćelija, pokretljivost (kroz aktinsku mrežu) i epitelnu diferencijaciju (predloženo da je neophodan za održavanje epidermnih matičnih ćelija).

Uloga u kanceru

uredi

Zajedno s drugom potporodicama, Rac i Rho proteina, imaj važnu regulatornu ulogu, posebno u pokretljivosti i rastu ćelija. Rac1 ima sveprisutnu tkivnu ekspresiju i podstiče pokretljivost ćelija stvaranjem lamelipodija.[12] Da bi ćlije raka mogle rasti i napadati lokalna i udaljena tkiva, deregulacija pokretljivosti ćelija jedan je od glavnih događaja u invaziji i [metastaza|[metastaziranju]] ćelija karcinoma.[13] Prekomjerna ekspresija konstitucijski aktivnog Rac1 V12 kod miševa uzrokovala je tumor koji se fenotipski ne razlikuje od ljudsog Kaposijevog sarkoma.[14] Pokazalo se da aktivacijske ili dobitne funkcije mutacije Rac1 imaju aktivnu ulogu u promociji mezenhimskog tipa kretanja ćelija, potpomognutog proteinskim kompleksima NEDD9 i DOCK3.[15] Takva abnormalna pokretljivost ćelija može rezultirati tranzicijom epitelnog mezenhima (EMT) – pokretačkim mehanizmom za metastaziranje tumora, kao i relapse tumora rezistentnog na lijekove.[16][17]

Uloga u transportu glukoze

uredi

Rac1 se ispoljava u značajnim količinama u tkivima osjetljivim na insulin, kau što su masno tkivo i skeletni mišići. Ovdje Rac1 regulira translokaciju prijenosnika glukoze GLUT4 iz unutarćelijskih odjeljaka u plazmamembranu.[9][18][19] U odgovoru na insulin, ovo omogućava ulazak glukoze u krv u ćeliji, radi smanjenja glukoze u krvi. U uvjetima gojaznosti i dijabetesa tipa 2, signalizacija Rac1 u skeletnim mišićima je disfunkcionalna, što sugerira da Rac1 doprinosi napredovanju bolesti.

Protein Rac1 je također neophodan za unos glukoze u skeletne mišiće aktivirane vježbanjem[8][20] i istezanjem.[21]

Klinički značaj

uredi

Aktivirajuće mutacije u Rac1 nedavno su otkrivene u velikim genomskim studijama koje uključuju melanom[22][23][24] i plućni karcinom malih ćelija.[25] Kao rezultat toga, Rac1 se smatra terapijskom metom za mnoge od ovih bolesti.[26]

Nekoliko nedavnih studija također je koristilo ciljanu terapiju za suzbijanje rasta tumora, farmakoinhibicijom aktivnosti Rac1 u metastatskom melanomu i karcinomu jetre, kao i u ljudskom [[Rak dojke|karcinomu dojke.[27][28][29]

Naprimjer, inhibicija puta ovisnog o Rac1 rezultirala je preokretom fenotipa tumorskih ćelija, što sugerira Rac1 kao prediktivni marker i terapijski cilj za rak dojke otporan na trastuzumab. Međutim, s obzirom na ulogu Rac1 u transportu glukoze , lijekovi koji inhibiraju Rac1 mogli bi biti štetni za homeostazu glukoze.

Dominantno negativan ili konstitutivno aktivno, klicne linije mutacije RAC1 uzrokuju različite fenotipove, koji su grupirani kao mentalna retardacija Tip 48.[30] Većina mutacija uzrokuje mikrocefaliju, dok neke specifične promjene rezultiraju makrocefalijom.

Interakcije

uredi

Pokazalo se da RAC1 ima interakcije sa:

Reference

uredi
  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000136238 - Ensembl, maj 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000001847 - Ensembl, maj 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
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  6. ^ 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.
  7. ^ 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.
  8. ^ a b Sylow, Lykke; Nielsen, Ida L.; Kleinert, Maximilian; Møller, Lisbeth L. V.; Ploug, Thorkil; Schjerling, Peter; Bilan, Philip J.; Klip, Amira; Jensen, Thomas E. (9. 4. 2016). "Rac1 governs exercise-stimulated glucose uptake in skeletal muscle through regulation of GLUT4 translocation in mice". The Journal of Physiology. 594 (17): 4997–5008. doi:10.1113/JP272039. ISSN 1469-7793. PMC 5009787. PMID 27061726.
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