Son of sevenless homolog 1 (SOS1)

Promotes the exchange of Ras-bound GDP by GTP (PubMed:8493579).

Probably by promoting Ras activation, modulates phosphorylation of MAP kinase MAPK3 in response to EGF (PubMed:17339331).

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). .