CYP3A4 - wikipedia CYP3A4 CYP3A4 Available structures PDB Human UniProt search : PDBe RCSB List of PDB id codes 1TQN, 1W0E, 1W0F, 1W0G, 2J0D, 2V0M, 3NXU, 3TJS, 3UA1, 4I3Q, 4I4G, 4I4H, 4K9T, 4K9U, 4K9V, 4K9W, 4K9X, 4NY4, 5A1P, 5A1R, 4D6Z, 4D75, 4D78, 4D7D Identifiers Aliases CYP3A4, CP33, CP34, CYP3A, CYP3A3, CYPIIIA3, CYPIIIA4, HLP, NF - 25, P450C3, P450PCN1, cytochrome P450 family 3 subfamily A member 4 External IDs OMIM : 124010 HomoloGene : 111391 GeneCards : CYP3A4 EC number 1.14. 13.32 Gene location ( Human ) Chr. Chromosome 7 ( human ) Band 7q22. 1 Start 99,756,960 bp End 99,784,265 bp RNA expression pattern More reference expression data Gene ontology Molecular function metal ion binding albendazole monooxygenase activity aromatase activity heme binding caffeine oxidase activity testosterone 6 - beta - hydroxylase activity oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen quinine 3 - monooxygenase activity taurochenodeoxycholate 6alpha - hydroxylase activity steroid binding vitamin D3 25 - hydroxylase activity steroid hydroxylase activity vitamin D 24 - hydroxylase activity oxygen binding enzyme binding iron ion binding oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen, reduced flavin or flavoprotein as one donor, and incorporation of one atom of oxygen monooxygenase activity oxidoreductase activity estrogen 16 - alpha - hydroxylase activity 1, 8 - cineole 2 - exo - monooxygenase activity Cellular component cytoplasm integral component of membrane membrane endoplasmic reticulum organelle membrane endoplasmic reticulum membrane intracellular membrane - bounded organelle Biological process drug metabolic process xenobiotic metabolic process heterocycle metabolic process drug catabolic process oxidative demethylation monoterpenoid metabolic process exogenous drug catabolic process steroid catabolic process androgen metabolic process alkaloid catabolic process vitamin D metabolic process lipid metabolic process oxidation - reduction process calcitriol biosynthetic process from calciol lipid hydroxylation steroid metabolic process Sources : Amigo / QuickGO Orthologs Species Human Mouse Entrez 1576 n / a Ensembl ENSG00000160868 n / a UniProt P08684 n / a RefSeq ( mRNA ) NM_001202855 NM_001202856 NM_001202857 NM_017460 n / a RefSeq ( protein ) NP_001189784 NP_059488 n / a Location ( UCSC ) Chr 7 : 99.76 -- 99.78 Mb n / a PubMed search n / a Wikidata View / Edit Human Cytochrome P450 3A4 ( abbreviated CYP3A4 ) ( EC 1.14. 13.97 ), is an important enzyme in the body, mainly found in the liver and in the intestine. It oxidizes small foreign organic molecules ( xenobiotics ), such as toxins or drugs, so that they can be removed from the body. While many drugs are deactivated by CYP3A4, there are also some drugs which are activated by the enzyme. Some substances, such as grapefruit juice and some drugs, interfere with the action of CYP3A4. These substances will therefore either amplify or weaken the action of those drugs that are modified by CYP3A4. CYP3A4 is a member of the cytochrome P450 family of oxidizing enzymes. Several other members of this family are also involved in drug metabolism, but CYP3A4 is the most common and the most versatile one. Like all members of this family, it is a hemoprotein, i.e. a protein containing a heme group with an iron atom. In humans, the CYP3A4 protein is encoded by the CYP3A4 gene. This gene is part of a cluster of cytochrome P genes on chromosome 7q21. 1. Contents 1 Function 2 Evolution 3 Tissue distribution 4 Mechanisms 5 Inhibition through fruit ingestion 6 Variability 7 Induction 8 Turnover 9 Technology 10 CYP3A4 ligands 11 Interactive pathway map 12 See also 13 References 14 External links Function 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 cholesterol, steroids, and other lipids components. The CYP3A4 protein localizes to the endoplasmic reticulum, and its expression is induced by glucocorticoids and some pharmacological agents. Cytochrome P450 enzymes metabolize approximately 60 % of prescribed drugs, CYP3A4 is responsible for about half of this metabolism, substrates include acetaminophen, codeine, ciclosporin ( cyclosporin ), diazepam, and erythromycin. The enzyme also metabolizes some steroids and carcinogens. Most drugs undergo deactivation by CYP3A4, either directly or by facilitated excretion from the body. Also, many substances are bioactivated by CYP3A4 to form their active compounds, and many protoxins being toxicated into their toxic forms ( for examples -- see table below ). CYP3A4 also possesses epoxygenase activity in that it metabolizes arachidonic acid to epoxyeicosatrienoic acids ( EETs ), i.e. ( ± ) - 8, 9 -, ( ± ) - 11, 12 -, and ( ± ) - 14, 15 - epoxyeicosatrienoic acids. The EETs have a wide range of activities including the promotion of certain types of cancers ( see epoxyeicosatetraenoic acid # cancer ). CYP3A4 promotes the growth of various types of human cancer cell lines in culture by producing ( ± ) - 14, 15 - epoxyeicosatrienoic acids which stimulate these cells to grow, The cytochrome P450 is also reported to have fatty acid monooxgenase activity for metabolizing arachidonic acid to 20 - Hydroxyeicosatetraenoic acid ( 20 - HETE ). 20 - HETE has a wide range of activities that also include growth stimulation in breast and other types of cancers ( see 12 - hydroxyeicosatetraenoic acid # cancer ). Evolution The CYP3A4 gene exhibits a much more complicated upstream regulatory region in comparison with its paralogs. This increased complexity renders the CYP3A4 gene more sensitive to endogenous and exogenous PXR and CAR ligands, instead of relying on gene variants for wider specificity. Chimpanzee and human CYP3A4 are highly conserved in metabolism of many ligands, although four amino acids positively selected in humans led to a 5-fold benzylation of 7 - BFC in the presence of the hepatotoxic secondary bile acid lithocholic acid. This change in consequence contributes to an increased human defense against cholestasis. Tissue distribution Fetuses do not really express CYP3A4 in their liver tissue, but rather CYP3A7 ( EC 1.14. 14.1 ), which acts on a similar range of substrates. CYP3A4 is absent in fetal liver but increases to approximately 40 % of adult levels in the fourth month of life and 72 % at 12 months. Although CYP3A4 is predominantly found in the liver, it is also present in other organs and tissues of the body, where it may play an important role in metabolism. CYP3A4 in the intestine plays an important role in the metabolism of certain drugs. Often this allows prodrugs to be activated and absorbed -- as in the case of the histamine H - receptor antagonist terfenadine. Recently CYP3A4 has also been identified in the brain, however its role in the central nervous system is still unknown. Mechanisms Cytochrome P450 enzymes perform an assortment of modifications on a variety of ligands, utilizing its large active site and its ability to bind more than one substrate at a time to perform complicated chemical alterations in the metabolism of endogenous and exogenous compounds. These include hydroxylation, epoxidation of olefins, aromatic oxidation, heteroatom oxidations, N - and O - dealkylation reactions, aldehyde oxidations, dehydrogenation reactions, and aromatase activity. Hydroxylation of an sp C-H bond is one of the ways in which CYP3A4 ( and cytochrome P450 oxygenases ) affects its ligand. In fact, hydroxylation is sometimes followed by dehydrogenation, leading to more complex metabolites. An example of a molecule that undergoes more than one reaction due to CYP3A4 includes tamoxifen, which is hydroxylated to 4 - hydroxy - tamoxifen and then dehydrated to 4 - hydroxy - tamoxifen quinone methide. Two mechanisms have been proposed as the primary pathway of hydroxylation in P450 enzymes. Two of the most commonly proposed mechanisms used for the hydroxylation of an sp3 C-H bond. The first pathway suggested is a cage - controlled radical method ( `` oxygen rebound '' ), and the second involves a concerted mechanism that does not utilize a radical intermediate but instead acts very quickly via a `` radical clock ''. Inhibition through fruit ingestion In 1998, various researchers showed that grapefruit juice, and grapefruit in general, is a potent inhibitor of CYP3A4, which can affect the metabolism of a variety of drugs, increasing their bioavailability. In some cases, this can lead to a fatal interaction with drugs like astemizole or terfenadine. The effect of grapefruit juice with regard to drug absorption was originally discovered in 1989. The first published report on grapefruit drug interactions was in 1991 in the Lancet entitled `` Interactions of Citrus Juices with Felodipine and Nifedipine '' and was the first reported food - drug interaction clinically. The effects of grapefruit last from 3 -- 7 days, with the greatest effects when juice is taken an hour previous to administration of the drug. In addition to grapefruit, other fruits have similar effects. Noni ( M. citrifolia ), for example, is a dietary supplement typically consumed as a juice and also inhibits CYP3A4 ; pomegranate juice has this effect as well. Variability While over 28 single nucleotide polymorphisms ( SNPs ) have been identified in the CYP3A4 gene, it has been found that this does not translate into significant interindividual variability in vivo. It can be supposed that this may be due to the induction of CYP3A4 on exposure to substrates. CYP3A4 alleles which have been reported to have minimal function compared to wild - type include CYP3A4 * 6 ( an A17776 insertion ) and CYP3A4 * 17 ( F189S ). Both of these SNPs led to decreased catalytic activity with certain ligands, including testosterone and nifedipine in comparison to wild - type metabolism. Variability in CYP3A4 function can be determined noninvasively by the erythromycin breath test ( ERMBT ). The ERMBT estimates in vivo CYP3A4 activity by measuring the radiolabelled carbon dioxide exhaled after an intravenous dose of ( C - N - methyl ) - erythromycin. Induction CYP3A4 is induced by a wide variety of ligands. These ligands bind to the pregnane X receptor ( PXR ). The activated PXR complex forms a heterodimer with the retinoid X receptor ( RXR ), which binds to the XREM region of the CYP3A4 gene. XREM is a regulatory region of the CYP3A4 gene, and binding causes a cooperative interaction with proximal promoter regions of the gene, resulting in increased transcription and expression of CYP3A4. Activation of the PXR / RXR heterodimer initiates transcription of the CYP3A4 promoter region and gene. Ligand binding increases when in the presence of CYP3A4 ligands, such as in the presence of aflatoxin B1, M1, and G1. Indeed, due to the enzyme 's large and malleable active site, it is possible for the enzyme to bind multiple ligands at once, leading to potentially detrimental side effects. Induction of CYP3A4 has been shown to vary in humans depending on sex. Evidence shows an increased drug clearance by CYP3A4 in women, even when accounting for differences in body weight. A study by Wolbold et al. ( 2003 ) found that the median CYP3A4 levels measured from surgically removed liver samples of a random sample of women exceeded CYP3A4 levels in the livers of men by 129 %. CYP3A4 mRNA transcripts were found in similar proportions, suggesting a pre-translational mechanism for the up - regulation of CYP3A4 in women. The exact cause of this elevated level of enzyme in women is still under speculation, however studies have elucidated other mechanisms ( such as CYP3A5 or CYP3A7 compensation for lowered levels of CYP3A4 ) that affect drug clearance in both men and women. CYP3A4 substrate activation varies amongst different animal species. Certain ligands activate human PXR, which promotes CYP3A4 transcription, while showing no activation in other species. For instance, mouse PXR is not activated by rifampicin and human PXR is not activated by pregnenalone 16α - carbonitrile In order to facilitate study of CYP3A4 functional pathways in vivo, mouse strains have been developed using transgenes in order to produce null / human CYP3A4 and PXR crosses. Although humanized hCYP3A4 mice successfully expressed the enzyme in their intestinal tract, low levels of hCYP3A4 were found in the liver. This effect has been attributed to CYP3A4 regulation by the growth hormone signal transduction pathway. In addition to providing an in vivo model, humanized CYP3A4 mice ( hCYP3A4 ) have been used to further emphasize gender differences in CYP3A4 activity. CYP3A4 activity levels have also been linked to diet and environmental factors, such as duration of exposure to xenobiotic substances. Due to the enzyme 's extensive presence in the intestinal mucosa, the enzyme has shown sensitivity to starvation symptoms and is upregulated in defense of adverse effects. Indeed, in fatheaded minnows, unfed female fish were shown to have increased PXR and CYP3A4 expression, and displayed a more pronounced response to xenobiotic factors after exposure after several days of starvation. By studying animal models and keeping in mind the innate differences in CYP3A4 activation, investigators can better predict drug metabolism and side effects in human CYP3A4 pathways. Turnover Estimates of the turnover rate of human CYP3A4 vary widely. For hepatic CYP3A4, in vivo methods yield estimates of enzyme half - life mainly in the range of 70 to 140 hours, whereas in vitro methods give estimates from 26 to 79 hours. Turnover of gut CYP3A4 is likely to be a function of the rate of enterocyte renewal ; an indirect approach based on recovery of activity following exposure to grapefruit juice yields measurements in the 12 - to 33 - hour range. Technology Due to membrane - bound CYP3A4 's natural propensity to conglomerate, it has historically been difficult to study drug binding in both solution and on surfaces. Co-crystallization is difficult since the substrates tend to have a low Kd ( between 5 - 150 μM ) and low solubility in aqueous solutions. A successful strategy in isolating the bound enzyme is the functional stabilization of monomeric CYP3A4 on Ag nanoparticles produced from nanosphere lithography and analyzed via localized surface plasmon resonance spectroscopy ( LSPR ). These analyses can be used as a high - sensitivity assay of drug binding, and may become integral in further high - throughput assays utilized in initial drug discovery testing. In addition to LSPR, CYP3A4 - Nanodisc complexes have been found helpful in other applications including solid - state NMR, redox potentiometry, and steady - state enzyme kinetics. CYP3A4 ligands Following is a table of selected substrates, inducers and inhibitors of CYP3A4. Where classes of agents are listed, there may be exceptions within the class. Inhibitors of CYP3A4 can be classified by their potency, such as : Strong inhibitor being one that causes at least a 5-fold increase in the plasma AUC values, or more than 80 % decrease in clearance. Moderate inhibitor being one that causes at least a 2-fold increase in the plasma AUC values, or 50 - 80 % decrease in clearance. Weak inhibitor being one that causes at least a 1.25-fold but less than 2-fold increase in the plasma AUC values, or 20 - 50 % decrease in clearance. Selected inducers, inhibitors and substrates of CYP3A4 Substrates Inhibitors Inducers some immunosuppressants ciclosporin ( cyclosporin ) tacrolimus sirolimus many chemotherapeutics docetaxel tamoxifen paclitaxel cyclophosphamide doxorubicin erlotinib etoposide ifosfamide teniposide vinblastine vincristine vindesine imatinib irinotecan sorafenib sunitinib vemurafenib temsirolimus anastrozole gefitinib azole antifungals ketoconazole itraconazole macrolides clarithromycin erythromycin telithromycin ( not azithromycin ) dapsone ( in leprosy ) tricyclic antidepressants amitriptyline clomipramine imipramine cyclobenzaprine SSRIs citalopram norfluoxetine sertraline some other antidepressants mirtazapine ( NaSSA ) nefazodone reboxetine venlafaxine ( SNRI ) trazodone ( SARI ) buspirone ( anxiolytic ) antipsychotics haloperidol aripiprazole risperidone ziprasidone pimozide quetiapine opioids ( mainly analgesics ) alfentanil buprenorphine ( analgesic, addiction maintenance treatment ) codeine ( analgesic, antitussive, antidiarrheal ) fentanyl hydrocodone ( partial involvement, not the bioactivation factor ) methadone ( analgesic, addiction maintenance treatment ) levacetylmethadol tramadol ( to inactive metabolites, do not confuse with metabolism via CYP2D6 ) benzodiazepines alprazolam midazolam triazolam diazepam ( bioactivation to desmethyldiazepam ) some hypnotics zopiclone zaleplon zolpidem donepezil ( acetylcholinesterase inhibitor ) statins atorvastatin lovastatin simvastatin cerivastatin ( not pravastatin ) ( not rosuvastatin ) calcium channel blockers diltiazem felodipine nifedipine verapamil amlodipine lercanidipine nitrendipine nisoldipine amiodarone ( class III antiarrhythmic ) dronedarone ( class III antiarrhythmic ) quinidine ( class I antiarrhythmic ) PDE5 inhibitors sildenafil tadalafil kinins ( vasodilators, smooth muscle contractors ) sex hormones agonists and antagonists finasteride ( antiandrogen ) estradiol ( estrogen ) progesterone ethinylestradiol ( hormonal contraceptive ) testosterone ( androgen ) toremifene ( SERM ) bicalutamide H1 - receptor antagonists terfenadine astemizole chlorphenamine Protease inhibitors indinavir ritonavir saquinavir nelfinavir non-nucleoside reverse transcriptase inhibitors nevirapine some glucocorticoids budesonide hydrocortisone dexamethasone albendazole ( antihelminthic ) cisapride ( 5 - HT4 receptor agonist ) aprepitant ( antiemetic ) caffeine ( stimulant ) cocaine ( stimulant ) cilostazol ( phosphodiesterase inhibitor ) dextromethorphan ( antitussive ) domperidone ( antidopaminergic ) eplerenone ( aldosterone antagonist ) lidocaine ( local anesthetic, antiarrhythmic ) ondansetron ( 5 - HT3 antagonist ) propranolol ( beta blocker ) salmeterol ( beta agonist ) warfarin ( anticoagulant ) clopidogrel, becoming bioactivated ( antiplatelet ) omeprazole ( proton pump inhibitor ) nateglinide ( antidiabetic ) methoxetamine montelukast ( leukotriene receptor antagonist ) Strong protease inhibitors ritonavir indinavir nelfinavir saquinavir some macrolide antibiotics clarithromycin telithromycin chloramphenicol ( antibiotic ) some azole antifungals ketoconazole itraconazole nefazodone ( antidepressant ) cobicistat Moderate aprepitant ( antiemetic ) some calcium channel blockers verapamil diltiazem some macrolide antibiotics erythromycin some azole antifungals fluconazole bergamottin ( constituent of grapefruit juice ) Valerian Weak cimetidine ( H2 - receptor antagonist ) buprenorphine ( analgesic ) cafestol ( in unfiltered coffee ) orphenadrine gabapentin valproic acid Unspecified potency amiodarone ( antiarrhythmic ) ciprofloxacin ( antibiotic ) dithiocarbamate ( functional group ) voriconazole ( antifungal ) imatinib ( anticancer ) mifepristone ( abortifacient ) norfloxacin ( antibiotic ) some non-nucleoside reverse transcriptase inhibitors delavirdine gestodene ( hormonal contraceptive ) mibefradil ( in angina pectoris ) fluvoxamine star fruit milk thistle niacinamide ginkgo biloba piperine isoniazid quercetin Strong potency antiandrogens Enzalutamide Unspecified potency anticonvulsants, mood stabilizers carbamazepine phenytoin ( anticonvulsant ) oxcarbazepine topiramate barbiturates phenobarbital Butalbital St. John 's wort some bactericidals rifampicin rifabutin some non-nucleoside reverse transcriptase inhibitors efavirenz nevirapine some hypoglycemics pioglitazone troglitazone glucocorticoids ( blood glucose increase, immunosuppressive ) modafinil ( stimulant ) quercetin capsaicin Interactive pathway map Click on genes, proteins and metabolites below to link to respective articles. 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Planta Medica. 82 ( 1 -- 2 ) : 121 -- 30. doi : 10.1055 / s - 0035 - 1557898. PMID 26366751. Jump up ^ Han EH, Kim HG, Choi JH, Jang YJ, Lee SS, Kwon KI, Kim E, Noh K, Jeong TC, Hwang YP, Chung YC, Kang W, Jeong HG ( May 2012 ). `` Capsaicin induces CYP3A4 expression via pregnane X receptor and CCAAT / enhancer - binding protein β activation ''. Molecular Nutrition & Food Research. 56 ( 5 ) : 797 -- 809. doi : 10.1002 / mnfr. 201100697. PMID 22648626. External links PharmGKB : Annotated PGx Gene Information for CYP3A4 CYP3A4 substrate prediction Human CYP3A4 genome location and CYP3A4 gene details page in the UCSC Genome Browser. This article incorporates text from the United States National Library of Medicine, which is in the public domain. PDB gallery 1tqn : Crystal Structure of Human Microsomal P450 3A4 1w0e : CRYSTAL STRUCTURE OF HUMAN CYTOCHROME P450 3A4 1w0f : CRYSTAL STRUCTURE OF HUMAN CYTOCHROME P450 3A4 1w0g : CRYSTAL STRUCTURE OF HUMAN CYTOCHROME P450 3A4 2j0d : CRYSTAL STRUCTURE OF HUMAN P450 3A4 IN COMPLEX WITH ERYTHROMYCIN Cytochromes, oxygenases : cytochrome P450 ( EC 1.14 ) CYP1 A1 A2 B1 CYP2 A6 A7 A13 B6 C8 C9 C18 C19 D6 E1 F1 J2 R1 S1 U1 W1 CYP3 ( CYP3A ) A4 A5 A7 A43 CYP4 A11 A22 B1 F2 F3 F8 F11 F12 F22 V2 X1 Z1 CYP5 - 20 CYP5 ( A1 ) CYP7 ( A1, B1 ) CYP8 ( A1, B1 ) CYP11 ( A1, B1, B2 ) CYP17 ( A1 ) CYP19 ( A1 ) CYP20 ( A1 ) CYP21 - 51 CYP21 ( A2 ) CYP24 ( A1 ) CYP26 ( A1, B1, C1 ) CYP27 ( A1, B1, C1 ) CYP39 ( A1 ) CYP46 ( A1 ) CYP51 ( A1 ) Oxidoreductases : dioxygenases, including steroid hydroxylases ( EC 1.14 ) 1.14. 11 : 2 - oxoglutarate Prolyl hydroxylase Lysyl hydroxylase 1.14. 13 : NADH or NADPH Flavin - containing monooxygenase FMO1 FMO2 FMO3 FMO4 FMO5 Nitric oxide synthase NOS1 NOS2 NOS3 Cholesterol 7 alpha - hydroxylase Methane monooxygenase 3A4 Lanosterol 14 alpha - demethylase 24 - hydroxycholesterol 7α - hydroxylase 1.14. 14 : reduced flavin or flavoprotein 19A1 2D6 2E1 1.14. 15 : reduced iron - sulfur protein 11B1 11B2 11A1 1.14. 16 : reduced pteridine ( BH4 dependent ) Phenylalanine hydroxylase Tyrosine hydroxylase Tryptophan hydroxylase 1.14. 17 : reduced ascorbate Dopamine beta - hydroxylase 1.14. 18 - 19 : other Tyrosinase Stearoyl - CoA desaturase - 1 1.14. 99 - miscellaneous Cyclooxygenase Heme oxygenase ( HMOX1 ) Squalene monooxygenase 17A1 21A2 Enzymes Activity Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Regulation Allosteric regulation Cooperativity Enzyme inhibitor Classification EC number Enzyme superfamily Enzyme family List of enzymes Kinetics Enzyme kinetics Eadie -- Hofstee diagram Hanes -- Woolf plot Lineweaver -- Burk plot Michaelis -- Menten kinetics Types EC1 Oxidoreductases ( list ) EC2 Transferases ( list ) EC3 Hydrolases ( list ) EC4 Lyases ( list ) EC5 Isomerases ( list ) EC6 Ligases ( list ) Molecular and Cellular Biology portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=CYP3A4&oldid=804684587 '' Categories : Genes on human chromosome 7 Cytochrome P450 EC 1.14. 14 Hidden categories : Articles needing more detailed references Wikipedia articles needing page number citations from November 2015 Webarchive template wayback links Wikipedia articles needing clarification from August 2016 Wikipedia articles incorporating text from the United States National Library of Medicine Talk Contents About Wikipedia Deutsch Eesti Español Esperanto Français Italiano Latina Македонски Nederlands 日本 語 Português Русский Suomi Українська 中文 Edit links This page was last edited on 10 October 2017, at 14 : 28. 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Question: drugs that are substrates of cytochrome p450 3a4 and cyp2d6
Answer: acetaminophen