Enzymes
| UniProtKB help_outline | 595 proteins |
Reaction participants Show >> << Hide
- Name help_outline all-trans-retinol Identifier CHEBI:17336 (Beilstein: 403040; CAS: 11103-57-4,68-26-8) help_outline Charge 0 Formula C20H30O InChIKeyhelp_outline FPIPGXGPPPQFEQ-OVSJKPMPSA-N SMILEShelp_outline C\C(=C/CO)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C 2D coordinates Mol file for the small molecule Search links Involved in 29 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline O2 Identifier CHEBI:15379 (CAS: 7782-44-7) help_outline Charge 0 Formula O2 InChIKeyhelp_outline MYMOFIZGZYHOMD-UHFFFAOYSA-N SMILEShelp_outline O=O 2D coordinates Mol file for the small molecule Search links Involved in 2,648 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
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Namehelp_outline
reduced [NADPH—hemoprotein reductase]
Identifier
RHEA-COMP:11964
Reactive part
help_outline
- Name help_outline FMNH2 Identifier CHEBI:57618 (Beilstein: 6258176) help_outline Charge -2 Formula C17H21N4O9P InChIKeyhelp_outline YTNIXZGTHTVJBW-SCRDCRAPSA-L SMILEShelp_outline Cc1cc2Nc3c([nH]c(=O)[nH]c3=O)N(C[C@H](O)[C@H](O)[C@H](O)COP([O-])([O-])=O)c2cc1C 2D coordinates Mol file for the small molecule Search links Involved in 771 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline all-trans-retinal Identifier CHEBI:17898 (CAS: 116-31-4) help_outline Charge 0 Formula C20H28O InChIKeyhelp_outline NCYCYZXNIZJOKI-OVSJKPMPSA-N SMILEShelp_outline [H]C(=O)\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C 2D coordinates Mol file for the small molecule Search links Involved in 9 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,176 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O Identifier CHEBI:15377 (Beilstein: 3587155; CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,048 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
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Namehelp_outline
oxidized [NADPH—hemoprotein reductase]
Identifier
RHEA-COMP:11965
Reactive part
help_outline
- Name help_outline FMN Identifier CHEBI:58210 Charge -3 Formula C17H18N4O9P InChIKeyhelp_outline ANKZYBDXHMZBDK-SCRDCRAPSA-K SMILEShelp_outline C12=NC([N-]C(C1=NC=3C(N2C[C@@H]([C@@H]([C@@H](COP(=O)([O-])[O-])O)O)O)=CC(=C(C3)C)C)=O)=O 2D coordinates Mol file for the small molecule Search links Involved in 781 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:42092 | RHEA:42093 | RHEA:42094 | RHEA:42095 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
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Publications
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Biosynthesis of all-trans-retinoic acid from all-trans-retinol: catalysis of all-trans-retinol oxidation by human P-450 cytochromes.
Chen H., Howald W.N., Juchau M.R.
Oxidative conversion of all-trans-retinol (t-ROH) to all-trans-retinal (t-RAL) is recognized as the rate-limiting step for biosynthesis of all-trans-retinoic acid from t-ROH in mammalian hepatic tissues. The purpose of this study was to investigate the role of human cytochrome P-450 (CYP)-dependen ... >> More
Oxidative conversion of all-trans-retinol (t-ROH) to all-trans-retinal (t-RAL) is recognized as the rate-limiting step for biosynthesis of all-trans-retinoic acid from t-ROH in mammalian hepatic tissues. The purpose of this study was to investigate the role of human cytochrome P-450 (CYP)-dependent monooxygenation in the conversion of t-ROH to t-RAL. Adult human liver microsomes (HLMS) were incubated with t-ROH, and retinoids generated were identified and quantified by liquid chromatography-mass spectroscopy, HPLC, and other methods. HLMS-catalyzed generation of t-RAL from t-ROH was primarily NADPH-dependent and was strongly inhibited by carbon monoxide. Rates of reactions increased linearly with time and concentrations of HLMS, and exhibited classical substrate saturation. These observations strongly indicated that the reaction proceeded via CYP-catalyzed monooxygenation. On the basis of responses to selective chemical inhibitors, isoforms from CYP family 1 and the CYP3A subfamily appeared to be very active. Members of the CYP2C subfamily and CYP2D6 exhibited lesser activities and CYP2A6, CYP2B6, and CYP2E1 were virtually inactive. cDNA-expressed human CYP enzymes (CYP SUPERSOMES) also were used to assess the capacity of individual CYP enzymes to catalyze the reaction. Based on responses to selective chemical inhibitors, specific activities, and levels present in adult human hepatic tissues, CYP1A2 and CYP3A4 strongly appeared to be the major CYP enzymes catalyzing hepatic oxidative conversion of t-ROH to t-RAL in the adult human liver. CYP1A1 and CYP1B1 SUPERSOMES both exhibited exceptionally high activities, and in extrahepatic tissues, these isoforms could play important roles in biosynthesis of all-trans-retinoic acid from t-ROH. << Less
Drug Metab. Dispos. 28:315-322(2000) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.