Apolipoprotein-H (APOH) Human Native Protein

Apolipoprotein H has been implicated in a variety of physiologic pathways including lipoprotein metabolism, coagulation, and the production of antiphospholipid autoantibodies. APOH may be a required cofactor for anionic phospholipid binding by the antiphospholipid autoantibodies found in sera of many patients with lupus and primary antiphospholipid syndrome, but it does not seem to be required for the reactivity of antiphospholipid autoantibodies associated with infections. [provided by RefSeq, Jul 2008]

APOH: Binds to various kinds of negatively charged substances such as heparin, phospholipids, and dextran sulfate. May prevent activation of the intrinsic blood coagulation cascade by binding to phospholipids on the surface of damaged cells.

Protein type: Lipid-binding; Secreted, signal peptide; Secreted

Chromosomal Location of Human Ortholog: 17q24.2

Cellular Component: extracellular matrix; extracellular space; chylomicron; cell surface

Molecular Function: heparin binding; identical protein binding; protein binding; phospholipid binding; glycoprotein binding; lipid binding

Biological Process: negative regulation of myeloid cell apoptosis; negative regulation of angiogenesis; positive regulation of blood coagulation; negative regulation of fibrinolysis; triacylglycerol metabolic process; negative regulation of endothelial cell proliferation; positive regulation of lipoprotein lipase activity; negative regulation of blood coagulation; triacylglycerol transport; blood coagulation, intrinsic pathway; plasminogen activation; regulation of fibrinolysis