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Catalytic Activities of Tumor-Specific Human Cytochrome P450 CYP2W1 Toward Endogenous Substrates.


ABSTRACT: CYP2W1 is a recently discovered human cytochrome P450 enzyme with a distinctive tumor-specific expression pattern. We show here that CYP2W1 exhibits tight binding affinities for retinoids, which have low nanomolar binding constants, and much poorer binding constants in the micromolar range for four other ligands. CYP2W1 converts all-transretinoic acid (atRA) to 4-hydroxyatRA and all-transretinol to 4-OH all-transretinol, and it also oxidizes retinal. The enzyme much less efficiently oxidizes 17?-estradiol to 2-hydroxy-(17?)-estradiol and farnesol to a monohydroxylated product; arachidonic acid is, at best, a negligible substrate. These findings indicate that CYP2W1 probably plays an important role in localized retinoid metabolism that may be intimately linked to its involvement in tumor development.

SUBMITTER: Zhao Y 

PROVIDER: S-EPMC4851306 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature

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Catalytic Activities of Tumor-Specific Human Cytochrome P450 CYP2W1 Toward Endogenous Substrates.

Zhao Yan Y   Wan Debin D   Yang Jun J   Hammock Bruce D BD   Ortiz de Montellano Paul R PR  

Drug metabolism and disposition: the biological fate of chemicals 20160302 5


CYP2W1 is a recently discovered human cytochrome P450 enzyme with a distinctive tumor-specific expression pattern. We show here that CYP2W1 exhibits tight binding affinities for retinoids, which have low nanomolar binding constants, and much poorer binding constants in the micromolar range for four other ligands. CYP2W1 converts all-transretinoic acid (atRA) to 4-hydroxyatRA and all-transretinol to 4-OH all-transretinol, and it also oxidizes retinal. The enzyme much less efficiently oxidizes 17β  ...[more]

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