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Related Experiment Videos

Cloning of epoxide hydratase complementary DNA.

F J Gonzalez, C B Kasper

    The Journal of Biological Chemistry
    |May 25, 1981
    PubMed
    Summary

    Researchers successfully isolated and cloned epoxide hydratase mRNA from rat liver polysomes. This work provides a key tool for studying epoxide hydratase gene expression and regulation.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Pharmacology

    Background:

    • Epoxide hydratase is a crucial enzyme in xenobiotic metabolism.
    • Understanding its gene expression is vital for toxicology and drug development.
    • Previous methods for studying epoxide hydratase mRNA were limited.

    Purpose of the Study:

    • To isolate and enrich epoxide hydratase mRNA from rat liver.
    • To construct and characterize cDNA clones representing epoxide hydratase mRNA.
    • To facilitate further studies on epoxide hydratase gene regulation.

    Main Methods:

    • Isolation of membrane-bound polysomes from rat liver after trans-stilbene oxide administration.
    • Immunochemical enrichment of epoxide hydratase mRNA using oligo(dT)-cellulose chromatography.
    • cDNA synthesis and insertion into pBR322 vector via oligo(dG)-oligo(dC) tailing.
    • Differential colony hybridization for clone selection.
    • Hybrid selection-translation and restriction endonuclease mapping for clone characterization.

    Main Results:

    • Enrichment of epoxide hydratase mRNA was achieved.
    • cDNA clones containing epoxide hydratase mRNA sequences were isolated.
    • A composite restriction map of 1310 base pairs was constructed, representing ~80% of the mRNA.
    • The 3'-5' orientation of the cloned sequence relative to the mRNA was determined.

    Conclusions:

    • The study successfully generated a collection of cDNA clones for epoxide hydratase mRNA.
    • These clones provide a valuable resource for investigating epoxide hydratase gene expression.
    • The characterized clones will aid in understanding the enzyme's role in xenobiotic metabolism.

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