Guanine nucleotide exchange factor VAV3 (VAV3)

Exchange factor for GTP-binding proteins RhoA, RhoG and, to a lesser extent, Rac1. Binds physically into the nucleotide-free states of these GTPases.

Plays an important role in angiogenesis. Its recruitment by phosphorylated EPHA2 is vital for EFNA1- induced RAC1 GTPase activation and vascular endothelial cell migration and assembly (By similarity).