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Sos1 | Son of sevenless homolog 1; Promotes the exchange of Ras-bound GDP by GTP. Probably by promoting Ras activation, regulates phosphorylation of MAP kinase MAPK3 in response to EGF (By similarity). 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. (1319 aa) | ||||
Sos2 | Son of sevenless homolog 2; Promotes the exchange of Ras-bound GDP by GTP. (1332 aa) |