Gas1 Proteins and Enzymes

The growth arrest-specific genes are related by their induction following cellular stress. Gas1 is a GPI-linked membrane glycoprotein that blocks entry to S phase cell cycle. Gas1 inhibits cell proliferation, protects endothelial cells from apoptosis, and promotes excitotoxic neuronal death. Gas6 is a vitamin K-dependent protein with a gamma-carboxylated amino terminus (Gla domain), four EGF-like repeats, and C-terminal globulin-like domains. Gas6 is a ligand for the Axl, Dtk, and Mer tyrosine kinase receptors. Gas6 is mitogenic and anti-apoptotic for some cell types and also promotes cell adhesion.