Ras-related C3 botulinum toxin substrate 1 (RAC1) (RAC1)

Ras-related C3 botulinum toxin substrate 1 (RAC1) is a member of the Rho family of small GTPases that functions as a molecular switch, cycling between an inactive GDP-bound state and an active GTP-bound state (UniProt P63000). It plays a fundamental role in regulating the actin cytoskeleton, which is essential for cell shape, adhesion, and motility (PubMed: 24550140). Beyond structural roles, RAC1 is involved in various signaling pathways that control cell proliferation, survival, and gene expression (NCBI Gene: 5879). In oncology, RAC1 is frequently overexpressed or hyperactivated, particularly through the P29S "fast-cycler" mutation found in melanoma, which drives metastasis and resistance to therapy (PubMed: 23064227). Therapeutic strategies focus on small molecule inhibitors that block its interaction with Guanine Nucleotide Exchange Factors (GEFs) or prevent GTP binding (PubMed: 30104678). However, developing clinical-grade inhibitors remains challenging due to the high affinity for GTP and the potential for off-target effects on other essential Rho GTPases (PubMed: 28655770).

Other names

RAC1p21-Rac1Ras-related C3 botulinum toxin substrate 1MIG5TC-25Cell migration-inducing gene 5 protein

Inhibition of Guanine Nucleotide Exchange Factor (GEF) interaction, competitive inhibition of GTP binding, or allosteric modulation to prevent activation (PubMed: 30104678).