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Cytochrome P450, family 1, subfamily A, polypeptide 2
PDB rendering based on 2hi4.
Available structures: 2hi4
Symbol(s) CYP1A2; CP12; P3-450; P450(PA)
External IDs OMIM: 124060 MGI: 88589 Homologene: 68082
RNA expression pattern

More reference expression data

Human Mouse
Entrez 1544 13077
Ensembl ENSG00000140505 ENSMUSG00000032310
Uniprot P05177 P00186
Refseq NM_000761 (mRNA)
NP_000752 (protein)
NM_009993 (mRNA)
NP_034123 (protein)
Location Chr 15: 72.83 - 72.84 Mb Chr 9: 57.48 - 57.48 Mb
Pubmed search [1] [2]

Cytochrome P450 1A2 (abbreviated CYP1A2), a member of the cytochrome P450 mixed-function oxidase system, is involved in the metabolism of xenobiotics in the body.

Expression of CYP1A2 appears to be induced by various dietary constituents.[1]


CYP1A2 Ligands

Table of selected substrates, inducers and inhibitors of CYP1A21

Substrates Inhibitors Inducers
Often mentioned [2]:


Strong [3]:


Often mentioned[2]:
  • tobacco



  1. ^ Fontana R, Lown K, Paine M, Fortlage L, Santella R, Felton J, Knize M, Greenberg A, Watkins P (1999). "Effects of a chargrilled meat diet on expression of CYP3A, CYP1A, and P-glycoprotein levels in healthy volunteers". Gastroenterology 117 (1): 89-98. PMID 10381914.
  2. ^ a b Mentioned both in the reference named FASS and were previously mentioned in Wikipedia. Further contributions may follow other systems
  3. ^ Swedish environmental classification of pharmaceuticals Facts for prescribers (Fakta för förskrivare)
  4. ^ Edwards DJ, Bernier SM (1996). "Inhibitory effect of grapefruit juice and its bitter principal, naringenin, on CYP1A2 dependent metabolism of caffeine in man". Life Sciences 59 (13): 1025-1030. PMID 8485024.
  • Meijerman I, Beijnen J, Schellens J. "Herb-drug interactions in oncology: focus on mechanisms of induction". Oncologist 11 (7): 742-52. PMID 16880233.

Further reading

  • Smith G, Stubbins MJ, Harries LW, Wolf CR (1999). "Molecular genetics of the human cytochrome P450 monooxygenase superfamily.". Xenobiotica 28 (12): 1129-65. PMID 9890157.
  • Landi MT, Sinha R, Lang NP, Kadlubar FF (1999). "Human cytochrome P4501A2.". IARC Sci. Publ. (148): 173-95. PMID 10493258.
  • Nelson DR, Zeldin DC, Hoffman SM, et al. (2004). "Comparison of cytochrome P450 (CYP) genes from the mouse and human genomes, including nomenclature recommendations for genes, pseudogenes and alternative-splice variants.". Pharmacogenetics 14 (1): 1-18. PMID 15128046.
  • Ikeya K, Jaiswal AK, Owens RA, et al. (1990). "Human CYP1A2: sequence, gene structure, comparison with the mouse and rat orthologous gene, and differences in liver 1A2 mRNA expression.". Mol. Endocrinol. 3 (9): 1399-408. PMID 2575218.
  • Butler MA, Iwasaki M, Guengerich FP, Kadlubar FF (1989). "Human cytochrome P-450PA (P-450IA2), the phenacetin O-deethylase, is primarily responsible for the hepatic 3-demethylation of caffeine and N-oxidation of carcinogenic arylamines.". Proc. Natl. Acad. Sci. U.S.A. 86 (20): 7696-700. PMID 2813353.
  • Quattrochi LC, Okino ST, Pendurthi UR, Tukey RH (1986). "Cloning and isolation of human cytochrome P-450 cDNAs homologous to dioxin-inducible rabbit mRNAs encoding P-450 4 and P-450 6.". DNA 4 (5): 395-400. PMID 3000715.
  • Quattrochi LC, Pendurthi UR, Okino ST, et al. (1986). "Human cytochrome P-450 4 mRNA and gene: part of a multigene family that contains Alu sequences in its mRNA.". Proc. Natl. Acad. Sci. U.S.A. 83 (18): 6731-5. PMID 3462722.
  • Wrighton SA, Campanile C, Thomas PE, et al. (1986). "Identification of a human liver cytochrome P-450 homologous to the major isosafrole-inducible cytochrome P-450 in the rat.". Mol. Pharmacol. 29 (4): 405-10. PMID 3517618.
  • Jaiswal AK, Nebert DW, McBride OW, Gonzalez FJ (1988). "Human P(3)450: cDNA and complete protein sequence, repetitive Alu sequences in the 3' nontranslated region, and localization of gene to chromosome 15.". J. Exp. Pathol. 3 (1): 1-17. PMID 3681487.
  • Jaiswal AK, Nebert DW, Gonzalez FJ (1986). "Human P3(450): cDNA and complete amino acid sequence.". Nucleic Acids Res. 14 (16): 6773-4. PMID 3755823.
  • Eugster HP, Probst M, Würgler FE, Sengstag C (1993). "Caffeine, estradiol, and progesterone interact with human CYP1A1 and CYP1A2. Evidence from cDNA-directed expression in Saccharomyces cerevisiae.". Drug Metab. Dispos. 21 (1): 43-9. PMID 8095225.
  • Schweikl H, Taylor JA, Kitareewan S, et al. (1994). "Expression of CYP1A1 and CYP1A2 genes in human liver.". Pharmacogenetics 3 (5): 239-49. PMID 8287062.
  • Yamazaki H, Inoue K, Mimura M, et al. (1996). "7-Ethoxycoumarin O-deethylation catalyzed by cytochromes P450 1A2 and 2E1 in human liver microsomes.". Biochem. Pharmacol. 51 (3): 313-9. PMID 8573198.
  • Hakkola J, Raunio H, Purkunen R, et al. (1996). "Detection of cytochrome P450 gene expression in human placenta in first trimester of pregnancy.". Biochem. Pharmacol. 52 (2): 379-83. PMID 8694864.
  • Guengerich FP, Johnson WW (1998). "Kinetics of ferric cytochrome P450 reduction by NADPH-cytochrome P450 reductase: rapid reduction in the absence of substrate and variations among cytochrome P450 systems.". Biochemistry 36 (48): 14741-50. doi:10.1021/bi9719399. PMID 9398194.
  • Wacke R, Kirchner A, Prall F, et al. (1998). "Up-regulation of cytochrome P450 1A2, 2C9, and 2E1 in chronic pancreatitis.". Pancreas 16 (4): 521-8. PMID 9598815.
  • Macé K, Bowman ED, Vautravers P, et al. (1998). "Characterisation of xenobiotic-metabolising enzyme expression in human bronchial mucosa and peripheral lung tissues.". Eur. J. Cancer 34 (6): 914-20. PMID 9797707.
  • Huang JD, Guo WC, Lai MD, et al. (1999). "Detection of a novel cytochrome P-450 1A2 polymorphism (F21L) in Chinese.". Drug Metab. Dispos. 27 (1): 98-101. PMID 9884316.
  • Tatemichi M, Nomura S, Ogura T, et al. (1999). "Mutagenic activation of environmental carcinogens by microsomes of gastric mucosa with intestinal metaplasia.". Cancer Res. 59 (16): 3893-8. PMID 10463577.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "CYP1A2". A list of authors is available in Wikipedia.
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