Activation of RAC1 by VAV

Stable Identifier
Reaction [transition]
Homo sapiens
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Rac1 exists in inactive state in the cytosol until the reception of extracellular signals by the cell. To be functional Rac1 is rapidly targeted to the plasma membrane upon cell stimulation. The main factors involved in this mobilisation are the Rac GEFs like VAV and phospholipids (PtdIns(4,5)P2, PtdIns(3,4,5) P3) and lipid rafts at the plasma membrane. VAV catalyses the disassociation of GDP from Rac1 by modifying the nucleotide-binding site such that GDP is released and subsequently replaced. The incoming GTP occupies the nucleotide binding site and finally displaces VAV from Rac1 (Bos et al. 2007, Bustelo et al. 2012).

Literature References
PubMed ID Title Journal Year
12670394 Vav1: a key signal transducer downstream of the TCR

Tybulewicz, VL, Ardouin, L, Prisco, A, Reynolds, LF

Immunol Rev 2003
17540168 GEFs and GAPs: critical elements in the control of small G proteins

Bos, JL, Rehmann, H, Wittinghofer, A

Cell 2007
Participant Of
Catalyst Activity
Catalyst Activity
guanyl-nucleotide exchange factor activity of p-5Y-LAT:GRB2:SOS1:GADS:p-Y113,Y128,Y145-SLP-76:PLCG1:PIP3:p-VAV [plasma membrane]
Physical Entity
Orthologous Events