Involved in the activation of Ras protein signal transduction (PubMed:22821884). Ras proteins bind GDP/GTP and possess intrinsic GTPase activity (PubMed:12740440, PubMed:14500341, PubMed:9020151). GTP + H2O = GDP + H(+) + phosphate Alternates between an inactive form bound to GDP and an active form bound to GTP. Activated by a guanine nucleotide-exchange factor (GEF) and inactivated by a GTPase-activating protein (GAP). In its GTP-bound form interacts with PLCE1 (PubMed:11022048). Interacts with TBC1D10C (PubMed:17230191). Interacts with RGL3 (By similarity). Interacts with HSPD1 (By similarity). Found in a complex with at least BRAF, HRAS, MAP2K1, MAPK3 and RGS14 (By similarity). Interacts (active GTP-bound form) with RGS14 (via RBD 1 domain) (By similarity). Forms a signaling complex with RASGRP1 and DGKZ (PubMed:11257115). Interacts with RASSF5 (PubMed:18596699). Interacts with PDE6D (PubMed:11980706). Interacts with IKZF3 (PubMed:10369681). Interacts with RACK1 (PubMed:14500341). Interacts with PIK3CG; the interaction is required for membrane recruitment and beta-gamma G protein dimer-dependent activation of the PI3K gamma complex PIK3CG:PIK3R6 (By similarity). Interacts with RAPGEF2 (PubMed:10608844, PubMed:11598133). The active GTP-bound form is localized most strongly to membranes than the inactive GDP-bound form (By similarity). Shuttles between the plasma membrane and the Golgi apparatus. Colocalizes with RACK1 to the perinuclear region. Widely expressed. Palmitoylated by the ZDHHC9-GOLGA7 complex. A continuous cycle of de- and re-palmitoylation regulates rapid exchange between plasma membrane and Golgi. S-nitrosylated; critical for redox regulation. Important for stimulating guanine nucleotide exchange. No structural perturbation on nitrosylation. The covalent modification of cysteine by 15-deoxy-Delta12,14-prostaglandin-J2 is autocatalytic and reversible. It may occur as an alternative to other cysteine modifications, such as S-nitrosylation and S-palmitoylation. Acetylation at Lys-104 prevents interaction with guanine nucleotide exchange factors (GEFs). Fatty-acylated at Lys-170. Ubiquitinated by the BCR(LZTR1) E3 ubiquitin ligase complex at Lys-170 in a non-degradative manner, leading to inhibit Ras signaling by decreasing Ras association with membranes. (Microbial infection) Glucosylated at Thr-35 by P.sordellii toxin TcsL (PubMed:8626586, PubMed:8626575, PubMed:9632667, PubMed:19744486). Monoglucosylation completely prevents the recognition of the downstream effector, blocking the GTPases in their inactive form, leading to inhibit Ras signaling (PubMed:8626586, PubMed:8626575, PubMed:9632667). The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. Disease susceptibility is associated with variants affecting the gene represented in this entry. Mutations which change positions 12, 13 or 61 activate the potential of HRAS to transform cultured cells and are implicated in a variety of human tumors. Disease susceptibility is associated with variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. Belongs to the small GTPase superfamily. Ras family.