Q5KQT7 · CP1A1_FELCA

Function

function

A cytochrome P450 monooxygenase involved in the metabolism of various endogenous substrates, including fatty acids, steroid hormones and vitamins. Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (CPR; NADPH-ferrihemoprotein reductase). Catalyzes the hydroxylation of carbon-hydrogen bonds. Exhibits high catalytic activity for the formation of hydroxyestrogens from estrone (E1) and 17beta-estradiol (E2), namely 2-hydroxy E1 and E2, as well as D-ring hydroxylated E1 and E2 at the C15alpha and C16alpha positions. Displays different regioselectivities for polyunsaturated fatty acids (PUFA) hydroxylation. Catalyzes the epoxidation of double bonds of certain PUFA. Converts arachidonic acid toward epoxyeicosatrienoic acid (EET) regioisomers, 8,9-, 11,12-, and 14,15-EET, that function as lipid mediators in the vascular system. Displays an absolute stereoselectivity in the epoxidation of eicosapentaenoic acid (EPA) producing the 17(R),18(S) enantiomer. May play an important role in all-trans retinoic acid biosynthesis in extrahepatic tissues. Catalyzes two successive oxidative transformation of all-trans retinol to all-trans retinal and then to the active form all-trans retinoic acid. May also participate in eicosanoids metabolism by converting hydroperoxide species into oxo metabolites (lipoxygenase-like reaction, NADPH-independent).

Catalytic activity

  • an organic molecule + O2 + reduced [NADPH--hemoprotein reductase] = an alcohol + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the backward direction.
    EC:1.14.14.1 (UniProtKB | ENZYME | Rhea)
  • estrone + O2 + reduced [NADPH--hemoprotein reductase] = 2-hydroxyestrone + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • estrone + O2 + reduced [NADPH--hemoprotein reductase] = 4-hydroxyestrone + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • estrone + O2 + reduced [NADPH--hemoprotein reductase] = 6alpha-hydroxyestrone + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • estrone + O2 + reduced [NADPH--hemoprotein reductase] = 15alpha-hydroxyestrone + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • estrone + O2 + reduced [NADPH--hemoprotein reductase] = 16alpha-hydroxyestrone + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • 17beta-estradiol + O2 + reduced [NADPH--hemoprotein reductase] = 2-hydroxy-17beta-estradiol + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • 17beta-estradiol + O2 + reduced [NADPH--hemoprotein reductase] = 4-hydroxy-17beta-estradiol + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • 17beta-estradiol + O2 + reduced [NADPH--hemoprotein reductase] = 6alpha-hydroxy-17beta-estradiol + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • 17beta-estradiol + O2 + reduced [NADPH--hemoprotein reductase] = 7alpha-hydroxy-17beta-estradiol + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • 17beta-estradiol + O2 + reduced [NADPH--hemoprotein reductase] = 15alpha-hydroxy-17beta-estradiol + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z)-eicosatrienoate + O2 + reduced [NADPH--hemoprotein reductase] = 19-hydroxy-(5Z,8Z,11Z)-eicosatrienoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = 16-hydroxy-(5Z,8Z,11Z,14Z)-eicosatetraenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = 17-hydroxy-(5Z,8Z,11Z,14Z)-eicosatetraenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = 18-hydroxy-(5Z,8Z,11Z,14Z)-eicosatetraenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = 19-hydroxy-(5Z,8Z,11Z,14Z)-eicosatetraenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 19-hydroxy-(5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = (8R,9S)-epoxy-(5Z,11Z,14Z)-eicosatrienoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = (11R,12S)-epoxy-(5Z,8Z,14Z)-eicosatrienoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = (14S,15R)-epoxy-(5Z,8Z,11Z)-eicosatrienoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = (14R,15S)-epoxy-(5Z,8Z,11Z)-eicosatrienoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (5Z,8Z,11Z,14Z,17Z)-eicosapentaenoate + O2 + reduced [NADPH--hemoprotein reductase] = (17R,18S)-epoxy-(5Z,8Z,11Z,14Z)-eicosatetraenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate + O2 + reduced [NADPH--hemoprotein reductase] = (19S,20R)-epoxy-(4Z,7Z,10Z,13Z,16Z)-docosapentaenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate + O2 + reduced [NADPH--hemoprotein reductase] = (19R,20S)-epoxy-(4Z,7Z,10Z,13Z,16Z)-docosapentaenoate + H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • all-trans-retinol + O2 + reduced [NADPH--hemoprotein reductase] = all-trans-retinal + H+ + 2 H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • all-trans-retinal + O2 + reduced [NADPH--hemoprotein reductase] = all-trans-retinoate + 2 H+ + H2O + oxidized [NADPH--hemoprotein reductase]
    This reaction proceeds in the forward direction.
  • (13S)-hydroperoxy-(9Z,11E)-octadecadienoate = 13-oxo-(9Z,11E)-octadecadienoate + H2O
    This reaction proceeds in the forward direction.
  • (12S)-hydroperoxy-(5Z,8Z,10E,14Z)-eicosatetraenoate = 12-oxo-(5Z,8Z,10E,14Z)-eicosatetraenoate + H2O
    This reaction proceeds in the forward direction.
    EC:4.2.1.152 (UniProtKB | ENZYME | Rhea)
  • (15S)-hydroperoxy-(5Z,8Z,11Z,13E)-eicosatetraenoate = 15-oxo-(5Z,8Z,11Z,13E)-eicosatetraenoate + H2O
    This reaction proceeds in the forward direction.
  • (5S)-hydroperoxy-(6E,8Z,11Z,14Z)-eicosatetraenoate = 5-oxo-(6E,8Z,11Z,14Z)-eicosatetraenoate + H2O
    This reaction proceeds in the forward direction.

Cofactor

heme (UniProtKB | Rhea| CHEBI:30413 )

Pathway

Steroid hormone biosynthesis.
Lipid metabolism; fatty acid metabolism.
Cofactor metabolism; retinol metabolism.

Features

Showing features for binding site.

TypeIDPosition(s)Description
Binding site229substrate
Binding site462Fe (UniProtKB | ChEBI) of heme (UniProtKB | ChEBI); axial binding residue

GO annotations

AspectTerm
Cellular Componentendoplasmic reticulum membrane
Cellular Componentintracellular membrane-bounded organelle
Cellular Componentmitochondrial inner membrane
Molecular Functionaromatase activity
Molecular Functionestrogen 16-alpha-hydroxylase activity
Molecular Functionestrogen 2-hydroxylase activity
Molecular Functionheme binding
Molecular FunctionHsp70 protein binding
Molecular FunctionHsp90 protein binding
Molecular Functionhydroperoxy icosatetraenoate dehydratase activity
Molecular Functioniron ion binding
Molecular Functionmonooxygenase activity
Biological Processestrogen metabolic process
Biological Processfatty acid metabolic process
Biological Processretinol metabolic process
Biological Processsteroid biosynthetic process

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Cytochrome P450 1A1
  • EC number
  • Alternative names
    • CYPIA1
    • Cytochrome P450 form 6
    • Cytochrome P450-C
    • Cytochrome P450-P1
    • Hydroperoxy icosatetraenoate dehydratase (EC:4.2.1.152
      ) . EC:4.2.1.152 (UniProtKB | ENZYME | Rhea)

Gene names

    • Name
      CYP1A1

Organism names

  • Taxonomic identifier
  • Taxonomic lineage
    Eukaryota > Metazoa > Chordata > Craniata > Vertebrata > Euteleostomi > Mammalia > Eutheria > Laurasiatheria > Carnivora > Feliformia > Felidae > Felinae > Felis

Accessions

  • Primary accession
    Q5KQT7

Proteomes

Subcellular Location

Endoplasmic reticulum membrane
; Peripheral membrane protein
Mitochondrion inner membrane
; Peripheral membrane protein
Microsome membrane
; Peripheral membrane protein
Cytoplasm

Keywords

PTM/Processing

Features

Showing features for chain, glycosylation.

TypeIDPosition(s)Description
ChainPRO_00002267261-517Cytochrome P450 1A1
Glycosylation72O-linked (GlcNAc) serine

Keywords

Proteomic databases

PTM databases

Interaction

Subunit

Interacts with cytosolic chaperones HSP70 and HSP90; this interaction is required for initial targeting to mitochondria. Interacts (via mitochondrial targeting signal) with TOMM40 (via N-terminus); this interaction is required for translocation across the mitochondrial outer membrane.

Structure

Family & Domains

Features

Showing features for region.

TypeIDPosition(s)Description
Region34-45Mitochondrial targeting signal

Sequence similarities

Belongs to the cytochrome P450 family.

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    517
  • Mass (Da)
    58,707
  • Last updated
    2005-02-15 v1
  • Checksum
    9CB7E5E3419362D1
MMLSVFGLSVPISATELLLASFVFCLVFWVVRAWQPRVPKGLKSPPGPWGWPLLGHVLTLGKNPHLVLARLSQHYGDVLQIRIGSTPVLVLSGLDTIRQALVRQGDDFKGRPNLYSFTLISEGQSMSFSPDSGPVWAARRRLAQNALKSFSIASDPASSSSCYLEDHVSKEAEYLIGKFQELMAKVGHFDPYRYVVVSVANVICAMCFGRRYDHDDQELLSIVNLSNEFGDGTASGNPVDFFPILRYLPNPALDFFKDVNEKFSIFIHKMVKEHYKTFEKGHIRDITDSLIEHCQDKRLDENANIQLSDEKIVNVVSDLFGAGFDTVTTAISWCLMYLVTSPNVQEKIQKELDTVIGRERQPRLSDRLQLPYMEAFILEMFRHTSFVPFTIPHSTTKDTSLSGFYIPKERCVFVNQWQINHDQKLWGDPSEFRPERFLTPDGTINKALSEKVILFGLGKRKCIGETIARLEVFLFLAILLQQVEFSVPQGTKVDMTPIYGLTMKHARCEHFQVRMRT

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AB199730
EMBL· GenBank· DDBJ
BAD86852.1
EMBL· GenBank· DDBJ
mRNA

Genome annotation databases

Similar Proteins

Disclaimer

Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. Our staff consists of biologists and biochemists that are not trained to give medical advice.
We'd like to inform you that we have updated our Privacy Notice to comply with Europe’s new General Data Protection Regulation (GDPR) that applies since 25 May 2018.
FeedbackHelp