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Cytochrome P450 1A2

NameCytochrome P450 1A2
Synonyms
  • 1.14.14.1
  • Cholesterol 25-hydroxylase
  • CYPIA2
  • Cytochrome P(3)450
  • Cytochrome P450 4
  • Cytochrome P450-P3
Gene NameCYP1A2
OrganismHuman
Amino acid sequence
>lcl|BSEQ0004778|Cytochrome P450 1A2
MALSQSVPFSATELLLASAIFCLVFWVLKGLRPRVPKGLKSPPEPWGWPLLGHVLTLGKN
PHLALSRMSQRYGDVLQIRIGSTPVLVLSRLDTIRQALVRQGDDFKGRPDLYTSTLITDG
QSLTFSTDSGPVWAARRRLAQNALNTFSIASDPASSSSCYLEEHVSKEAKALISRLQELM
AGPGHFDPYNQVVVSVANVIGAMCFGQHFPESSDEMLSLVKNTHEFVETASSGNPLDFFP
ILRYLPNPALQRFKAFNQRFLWFLQKTVQEHYQDFDKNSVRDITGALFKHSKKGPRASGN
LIPQEKIVNLVNDIFGAGFDTVTTAISWSLMYLVTKPEIQRKIQKELDTVIGRERRPRLS
DRPQLPYLEAFILETFRHSSFLPFTIPHSTTRDTTLNGFYIPKKCCVFVNQWQVNHDPEL
WEDPSEFRPERFLTADGTAINKPLSEKMMLFGMGKRRCIGEVLAKWEIFLFLAILLQQLE
FSVPPGVKVDLTPIYGLTMKHARCEHVQARRFSIN
Number of residues515
Molecular Weight58293.76
Theoretical pI9.43
GO Classification
Functions
  • 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
  • enzyme binding
  • electron carrier activity
  • aromatase activity
  • caffeine oxidase activity
  • demethylase activity
  • oxidoreductase activity
  • iron ion binding
  • heme binding
  • monooxygenase activity
Processes
  • methylation
  • oxidative deethylation
  • epoxygenase P450 pathway
  • oxidative demethylation
  • exogenous drug catabolic process
  • toxin biosynthetic process
  • steroid catabolic process
  • small molecule metabolic process
  • response to estradiol
  • monocarboxylic acid metabolic process
  • lung development
  • post-embryonic development
  • alkaloid metabolic process
  • oxidation-reduction process
  • cellular response to cadmium ion
  • regulation of gene expression
  • response to lipopolysaccharide
  • dibenzo-p-dioxin metabolic process
  • response to immobilization stress
  • drug catabolic process
  • xenobiotic metabolic process
  • heterocycle metabolic process
  • arachidonic acid metabolic process
  • hydrogen peroxide biosynthetic process
  • drug metabolic process
  • cellular respiration
  • monoterpenoid metabolic process
  • porphyrin-containing compound metabolic process
  • omega-hydroxylase P450 pathway
Components
  • intracellular membrane-bounded organelle
  • endoplasmic reticulum membrane
General FunctionOxidoreductase 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
Specific FunctionCytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Most active in catalyzing 2-hydroxylation. Caffeine is metabolized primarily by cytochrome CYP1A2 in the liver through an initial N3-demethylation. Also acts in the metabolism of aflatoxin B1 and acetaminophen. Participates in the bioactivation of carcinogenic aromatic and heterocyclic amines. Catalizes the N-hydroxylation of heterocyclic amines and the O-deethylation of phenacetin.
Pfam Domain Function
Transmembrane RegionsNot Available
GenBank Protein IDNot Available
UniProtKB IDP05177
UniProtKB Entry NameCP1A2_HUMAN
Cellular LocationEndoplasmic reticulum membrane
Gene sequence
>lcl|BSEQ0011742|Cytochrome P450 1A2 (CYP1A2)
ATGGCATTGTCCCAGTCTGTTCCCTTCTCGGCCACAGAGCTTCTCCTGGCCTCTGCCATC
TTCTGCCTGGTATTCTGGGTGCTCAAGGGTTTGAGGCCTCGGGTCCCCAAAGGCCTGAAA
AGTCCACCAGAGCCATGGGGCTGGCCCTTGCTCGGGCATGTGCTGACCCTGGGGAAGAAC
CCGCACCTGGCACTGTCAAGGATGAGCCAGCGCTACGGGGACGTCCTGCAGATCCGCATT
GGCTCCACGCCCGTGCTGGTGCTGAGCCGCCTGGACACCATCCGGCAGGCCCTGGTGCGG
CAGGGCGACGATTTCAAGGGCCGGCCTGACCTCTACACCTCCACCCTCATCACTGATGGC
CAGAGCTTGACCTTCAGCACAGACTCTGGACCGGTGTGGGCTGCCCGCCGGCGCCTGGCC
CAGAATGCCCTCAACACCTTCTCCATCGCCTCTGACCCAGCTTCCTCATCCTCCTGCTAC
CTGGAGGAGCATGTGAGCAAGGAGGCTAAGGCCCTGATCAGCAGGTTGCAGGAGCTGATG
GCAGGGCCTGGGCACTTCGACCCTTACAATCAGGTGGTGGTGTCAGTGGCCAACGTCATT
GGTGCCATGTGCTTCGGACAGCACTTCCCTGAGAGTAGCGATGAGATGCTCAGCCTCGTG
AAGAACACTCATGAGTTCGTGGAGACTGCCTCCTCCGGGAACCCCCTGGACTTCTTCCCC
ATCCTTCGCTACCTGCCTAACCCTGCCCTGCAGAGGTTCAAGGCCTTCAACCAGAGGTTC
CTGTGGTTCCTGCAGAAAACAGTCCAGGAGCACTATCAGGACTTTGACAAGAACAGTGTC
CGGGACATCACGGGTGCCCTGTTCAAGCACAGCAAGAAGGGGCCTAGAGCCAGCGGCAAC
CTCATCCCACAGGAGAAGATTGTCAACCTTGTCAATGACATCTTTGGAGCAGGATTTGAC
ACAGTCACCACAGCCATCTCCTGGAGCCTCATGTACCTTGTGACCAAGCCTGAGATACAG
AGGAAGATCCAGAAGGAGCTGGACACTGTGATTGGCAGGGAGCGGCGGCCCCGGCTCTCT
GACAGACCCCAGCTGCCCTACTTGGAGGCCTTCATCCTGGAGACCTTCCGACACTCCTCC
TTCTTGCCCTTCACCATCCCCCACAGCACAACAAGGGACACAACGCTGAATGGCTTCTAC
ATCCCCAAGAAATGCTGTGTCTTCGTAAACCAGTGGCAGGTCAACCATGACCCAGAGCTG
TGGGAGGACCCCTCTGAGTTCCGGCCTGAGCGGTTCCTCACCGCCGATGGCACTGCCATT
AACAAGCCCTTGAGTGAGAAGATGATGCTGTTTGGCATGGGCAAGCGCCGGTGTATCGGG
GAAGTCCTGGCCAAGTGGGAGATCTTCCTCTTCCTGGCCATCCTGCTACAGCAACTGGAG
TTCAGCGTGCCGCCGGGCGTGAAAGTCGACCTGACCCCCATCTACGGGCTGACCATGAAG
CACGCCCGCTGTGAACATGTCCAGGCGCGGCTGCGCTTCTCCATCAATTGA
GenBank Gene IDZ00036
GeneCard IDNot Available
GenAtlas IDCYP1A2
HGNC IDHGNC:2596
Chromosome Location15
Locus15q24
References
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  2. Quattrochi LC, Pendurthi UR, Okino ST, Potenza C, Tukey RH: 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. 1986 Sep;83(18):6731-5. 3462722
  3. Ikeya K, Jaiswal AK, Owens RA, Jones JE, Nebert DW, Kimura S: Human CYP1A2: sequence, gene structure, comparison with the mouse and rat orthologous gene, and differences in liver 1A2 mRNA expression. Mol Endocrinol. 1989 Sep;3(9):1399-408. 2575218
  4. Jaiswal AK, Nebert DW, McBride OW, Gonzalez FJ: 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. 1987 Winter;3(1):1-17. 3681487
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