VAV exchanges GTP for GDP on RAC1, activating it

Stable Identifier
Reaction [transition]
Homo sapiens
Locations in the PathwayBrowser
SVG |   | PPTX  | SBGN
Click the image above or here to open this reaction in the Pathway Browser
The layout of this reaction may differ from that in the pathway view due to the constraints in pathway layout

Activated proto-oncogene vav (VAV) act as guanine nucleotide exchange factors (GEFs) for RAC1, catalysing the exchange of bound GDP for GTP. Endocytosis of large EPH:EFN complexes is dependent on RAC1-regulated actin polymerisation. RAC1 signaling is positively linked to EPH:EFN internalization but the exact link to clathrin endocytosis machinery remains unclear. Inhibiting RAC1 signalling and Arp2/3-driven actin polymerization in EPH receptor-expressing cells completely blocks both endocytosis of EPH:EFN complexes and cell retraction (Marston et al. 2003). In response to repulsive guidance molecules, the function of RAC1 changes from promoting actin polymerization associated with axon growth to driving endocytosis of the plasma membrane, resulting in growth cone collapse (Jurney et al. 2002).

Literature References
PubMed ID Title Journal Year
12973357 Rac-dependent trans-endocytosis of ephrinBs regulates Eph-ephrin contact repulsion

Marston, DJ, Dickinson, S, Nobes, CD

Nat. Cell Biol. 2003
Catalyst Activity

guanyl-nucleotide exchange factor activity of EFNAs/EFNBs:p-EPHAs/p-EPHBs:SFKs:p-VAV2,VAV3 [plasma membrane]

Orthologous Events
Cite Us!