Cytochrome P450 3a4 (CYP3A4) Antibody – Rabbit Polyclonal

This gene encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases that catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and its expression is induced by glucocorticoids and some pharmacological agents. This enzyme is involved in the metabolism of approximately half the drugs in use today, including acetaminophen, codeine, cyclosporin A, diazepam and erythromycin. The enzyme also metabolizes some steroids and carcinogens. This gene is part of a cluster of cytochrome P450 genes on chromosome 7q21.1. Previously another CYP3A gene, CYP3A3, was thought to exist; however, it is now thought that this sequence represents a transcript variant of CYP3A4. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Feb 2011]

CYP3A4: Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It performs a variety of oxidation reactions (e.g. caffeine 8-oxidation, omeprazole sulphoxidation, midazolam 1'-hydroxylation and midazolam 4- hydroxylation) of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Acts as a 1,8-cineole 2- exo-monooxygenase. The enzyme also hydroxylates etoposide. Belongs to the cytochrome P450 family.

Protein type: Cell surface; Cofactor and Vitamin Metabolism - retinol; EC 1.14.14.1; Lipid Metabolism - linoleic acid; Membrane protein, integral; Oxidoreductase; Xenobiotic Metabolism - drug metabolism - cytochrome P450; Xenobiotic Metabolism - drug metabolism - other enzymes; Xenobiotic Metabolism - metabolism by cytochrome P450

Chromosomal Location of Human Ortholog: 7q22.1

Cellular Component: cytoplasm; endoplasmic reticulum membrane; intracellular membrane-bound organelle

Molecular Function: enzyme binding; iron ion binding; monooxygenase activity; oxidoreductase activity; oxygen binding; steroid binding; steroid hydroxylase activity; testosterone 6-beta-hydroxylase activity; vitamin D3 25-hydroxylase activity

Biological Process: alkaloid catabolic process; androgen metabolic process; drug catabolic process; drug metabolic process; exogenous drug catabolic process; heterocycle metabolic process; lipid metabolic process; monoterpenoid metabolic process; steroid catabolic process; steroid metabolic process; vitamin D metabolic process; xenobiotic metabolic process