Promotes the exchange of Ras-bound GDP by GTP . Probably by promoting Ras activation, regulates phosphorylation of MAP kinase MAPK3 in response to EGF . Catalytic component of a trimeric complex that participates in transduction of signals from Ras to Rac by promoting the Rac-specific guanine nucleotide exchange factor (GEF) activity (By similarity).
Expressed in gingival tissues.