ANXA1: a calcium/phospholipid-binding protein with which promotes membrane fusion and is involved in endocytosis. Has anti-inflammatory properties and inhibits phospholipase A2 activity. Accumulates on internalized vesicles after EGF-stimulated endocytosis, suggesting that it may be required for a late stage in inward vesiculation. Phosphorylated by PKC, EGFR and Chak1. Phosphorylation results in loss of the inhibitory activity. Annexins are a family of structurally related proteins whose common property is calcium-dependent binding to phospholipids. There are at least ten different annexins in mammalian species. Annexins do not contain signal peptides, yet some annexins (A1, A2 and A5) appear to be secreted in a physiologically regulated fashion.
Protein type: Lipid-binding; Calcium-binding
Cellular Component: extracellular space; focal adhesion; protein complex; mast cell granule; cell surface; cornified envelope; cilium; cell projection; membrane; cytoplasm; mitochondrial membrane; plasma membrane; nucleus; vesicle; endosome; sarcolemma
Molecular Function: protein binding, bridging; phospholipase inhibitor activity; protein binding; protein homodimerization activity; single-stranded RNA binding; calcium-dependent phospholipid binding; phospholipase A2 inhibitor activity; double-stranded DNA-dependent ATPase activity; phospholipid binding; calcium ion binding; structural molecule activity; calcium-dependent protein binding; helicase activity; single-stranded DNA binding
Biological Process: negative regulation of protein secretion; positive regulation of neutrophil apoptosis; positive regulation of apoptosis; alpha-beta T cell differentiation; positive regulation of vesicle fusion; neutrophil homeostasis; signal transduction; arachidonic acid secretion; DNA duplex unwinding; regulation of cell proliferation; keratinocyte differentiation; cell surface receptor linked signal transduction; insulin secretion; DNA strand renaturation; peptide cross-linking; positive regulation of prostaglandin biosynthetic process
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