Son of sevenless homolog 1 (SOS1) is the guanine nucleotide exchange factor (GEF) for rat sarcoma (RAS) protein. SOS1 activates RAS nucleotide exchange from the inactive form (bound to GDP) to an active form (bound to GTP).
Chardin, P, Camonis, JH, Gale, NW, Van Aelst, L, Schlessinger, J, Wigler, MH, Bar-Sagi, D
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