APOA4 Lysate – Tissue Lysate

Apoliprotein (apo) A-IV gene contains 3 exons separated by two introns. A sequence polymorphism has been identified in the 3'UTR of the third exon. The primary translation product is a 396-residue preprotein which after proteolytic processing is secreted its primary site of synthesis, the intestine, in association with chylomicron particles. Although its precise function is not known, apo A-IV is a potent activator of lecithin-cholesterol acyltransferase in vitro. [provided by RefSeq, Jul 2008]

APOA4: May have a role in chylomicrons and VLDL secretion and catabolism. Required for efficient activation of lipoprotein lipase by ApoC-II; potent activator of LCAT. Apoa-IV is a major component of HDL and chylomicrons. Synthesized primarily in the intestine and secreted in plasma. Belongs to the apolipoprotein A1/A4/E family.

Protein type: Cell adhesion; Endoplasmic reticulum; Lipid-binding; Secreted, signal peptide; Secreted

Chromosomal Location of Human Ortholog: 11q23

Cellular Component: extracellular space; chylomicron; cell surface; endoplasmic reticulum lumen; early endosome; extracellular region; cytosol

Molecular Function: lipid transporter activity; antioxidant activity; protein binding; protein homodimerization activity; copper ion binding; cholesterol transporter activity; cholesterol binding; phosphatidylcholine binding; lipid binding

Biological Process: multicellular organismal lipid catabolic process; positive regulation of fatty acid biosynthetic process; phototransduction, visible light; cholesterol metabolic process; removal of superoxide radicals; neurite regeneration; lipid homeostasis; protein-lipid complex assembly; cholesterol efflux; lipoprotein metabolic process; lipid transport; cholesterol biosynthetic process; phosphatidylcholine metabolic process; cholesterol homeostasis; leukocyte adhesion; reverse cholesterol transport; phospholipid efflux; innate immune response in mucosa; regulation of cholesterol absorption; response to lipid hydroperoxide; hydrogen peroxide catabolic process; positive regulation of lipoprotein lipase activity; retinoid metabolic process; regulation of cholesterol transport