H-ras proto-oncogene protein (Harvey ras, p21Hras, Ha-ras)
Jump to navigation
Jump to search
Introduction
Harvey ras. One of 4 'true' ras proteins [p21ras].
Function
- Ras proteins bind GDP/GTP & possess intrinsic GTPase activity
- in its GTP-bound form interacts with PLCE1
- interacts with TBC1D10C.
- interacts with RGL3 (putative)
- forms a signaling complex with RASGRP1 & DGKZ
- alternates between an inactive form bound to GDP & an active form bound to GTP
- activated by a guanine nucleotide-exchange factor (GEF)
- inactivated by a GTPase-activating protein (GAP)
- palmitoylated by the ZDHHC9-GOLGA7 complex
- a continuous cycle of de- & re-palmitoylation regulates rapid exchange between plasma membrane & Golgi
- p21ras binds to & activates raf1 protein probably in association with other proteins; raf1 activates MEK which in turn activates MAP kinases
Structure
belongs to the small GTPase superfamily, Ras family
Compartment
- cell membrane, lipid-anchor, cytoplasmic side
- Golgi membrane, lipid-anchor
- shuttles between the plasma membrane & the Golgi apparatus
Pathology
- defects in HRAS are the cause of
- Costello syndrome
- bladder cancer
- oral squamous cell carcinoma
- mutations which change positions 12, 13 or 61 activate the potential of c-ras to transform cultured cells & are implicated in a variety of human tumors
More general terms
References
- ↑ Boguski MS & McCormick F Proteins regulating Ras and its relative. Nature 366:643 1993 PMID: https://www.ncbi.nlm.nih.gov/pubmed/8259209
- ↑ UniProt http://www.uniprot.org/uniprot/P01112.html
- ↑ Atlas of genetics & cytogenetics in oncology & haematology http://atlasgeneticsoncology.org/genes/HRASID108.html
- ↑ GeneReviews https://www.genecards.org/cgi-bin/carddisp.pl?gene=HRAS