APOB sirna
APOB siRNA (Mouse)
NCBI and Uniprot Product Information
NCBI Description
This gene product is the main apolipoprotein of chylomicrons and low density lipoproteins. It occurs in plasma as two main isoforms, apoB-48 and apoB-100. Unlike the apoB-48 and apoB-100 structural equivalents in human, which are synthesized exclusively in the gut and liver, respectively, the mouse apoB-48 isoform is also found in mouse liver. The intestinal and the hepatic forms of apoB are encoded by a single gene from a single, very long mRNA. The two isoforms share a common N-terminal sequence. The shorter apoB-48 protein is produced after RNA editing of the apoB-100 transcript at residue 2179 (CAA->UAA), resulting in the creation of a stop codon, and early translation termination. [provided by RefSeq, Jul 2008]
Uniprot Description
APOB: Apolipoprotein B is a major protein constituent of chylomicrons (apo B-48), LDL (apo B-100) and VLDL (apo B-100). Apo B-100 functions as a recognition signal for the cellular binding and internalization of LDL particles by the apoB/E receptor. Defects in APOB are a cause of familial hypobetalipoproteinemia type 1 (FHBL1). A disorder characterized by highly reduced plasma concentrations of low density lipoproteins, and dietary fat malabsorption. Clinical presentation may vary from no symptoms to severe gastrointestinal and neurological dysfunction similar to abetalipoproteinemia. Defects in APOB are a cause of familial ligand-defective apolipoprotein B-100 (FDB). FDB is a dominantly inherited disorder of lipoprotein metabolism leading to hypercholesterolemia and increased proneness to coronary artery disease (CAD). The plasma cholesterol levels are dramatically elevated due to impaired clearance of LDL particles by defective APOB/E receptors. Defects in APOB associated with defects in other genes (polygenic) can contribute to hypocholesterolemia.
Protein type: Secreted, signal peptide; Carrier; Secreted
Cellular Component: Golgi apparatus; extracellular space; chylomicron; cell soma; intracellular membrane-bound organelle; endoplasmic reticulum; cytoplasm; extracellular region; plasma membrane; vesicle membrane; actin cytoskeleton
Molecular Function: lipid transporter activity; heparin binding; low-density lipoprotein receptor binding; cholesterol transporter activity; phospholipid binding; lipid binding
Biological Process: steroid metabolic process; cholesterol metabolic process; nervous system development; lipoprotein catabolic process; cholesterol transport; in utero embryonic development; regulation of cholesterol biosynthetic process; cholesterol efflux; lipoprotein metabolic process; lipid transport; response to carbohydrate stimulus; post-embryonic development; sperm motility; cholesterol homeostasis; fertilization; lipoprotein biosynthetic process; transport; lipoprotein transport; triacylglycerol catabolic process; artery morphogenesis; spermatogenesis; lipid metabolic process; triacylglycerol mobilization; lipid catabolic process