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CYP3A4 is 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 steroids (including cholesterol), and other lipids.
n/a Ensembl n/a n/a UniProt n a n/a RefSeq (mRNA) NM_000775 n/a RefSeq (protein) n/a n/a Location (UCSC) n/a n/a PubMed search n/a Wikidata View/Edit Human Cytochrome P450, family 3, subfamily A, also known as CYP3A, is a human gene locus. A homologous locus is found in mice. The CYP3A locus includes all the known members of the 3A subfamily of the cytochrome P450 superfamily of genes. These ...
"The Life Raft Group: Long List of Inhibitors and Inducers of CYP3A4 and CYP2D6". "DRUGBANK Online: Cytochrome P-450 Enzyme Inhibitors" . "MEDICATIONS METABOLIZED BY CYTOCHROME P450 3A4" (PDF) .
CYP3A4 is a metabolizing enzyme for almost 50% of drugs, and is found in the liver and small intestinal epithelial cells. [19] Organic derivatives of furanocoumarin interfere with liver and intestinal enzyme CYP3A4 and may be responsible for the effects of grapefruit on the enzyme. [20]
6β-hydroxycortisol is being investigated as a potential biomarker of 6β-hydroxysteroid dehydrogenase (CYP3A4) activity and may have diagnostic or prognostic value in certain diseases. Understanding the role of 6β-hydroxycortisol in human physiology and disease may lead to the development of new diagnostic and therapeutic strategies.
CYP3A4 inducers can counteract the inhibiting effects of ritonavir and lead to drastically reduced levels of "boosted" drugs, increasing the risk of developing drug resistance. Other CYP3A4 inhibitors may have an additive effect with ritonavir, causing increased drug levels. [9]
Cobicistat is a potent inhibitor of cytochrome P450 3A enzymes, including the important CYP3A4 subtype. It also inhibits intestinal transport proteins, increasing the overall absorption of several HIV medications, including atazanavir, darunavir, and tenofovir alafenamide. [5]
Cytochrome P450 reductase (also known as NADPH:ferrihemoprotein oxidoreductase, NADPH:hemoprotein oxidoreductase, NADPH:P450 oxidoreductase, P450 reductase, POR, CPR, CYPOR) is a membrane-bound enzyme required for electron transfer from NADPH to cytochrome P450 [5] and other heme proteins including heme oxygenase in the endoplasmic reticulum [6] of the eukaryotic cell.