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Related Experiment Videos

Renal trehalase: two subsites at the substrate-binding site.

M Nakano, B Sacktor

    Biochimica Et Biophysica Acta
    |November 23, 1984
    PubMed
    Summary

    Renal trehalase activity was studied using competitive and noncompetitive inhibitors. Kinetic analysis suggests distinct binding sites for phlorizin and phloretin/Tris, with SH-inhibitor and substrate sites located closely.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Renal Physiology

    Background:

    • Trehalase is a key enzyme in carbohydrate metabolism.
    • Understanding its active site is crucial for enzyme kinetics and drug development.
    • Inhibitors are valuable tools for probing enzyme mechanisms.

    Purpose of the Study:

    • To investigate the kinetic properties of purified renal trehalase.
    • To elucidate the substrate-binding site characteristics using various inhibitors.
    • To propose a model for the trehalase active site.

    Main Methods:

    • Purification of renal trehalase.
    • Enzyme inhibition kinetic studies using competitive and noncompetitive inhibitors (phlorizin, phloretin, Tris, beta-methylglucoside, mercuric chloride).
    • Multi-inhibition kinetic analysis to determine inhibitor interactions.

    Main Results:

    • Phlorizin, phloretin, Tris, and beta-methylglucoside competitively inhibited trehalase with respect to trehalose.
    • Mercuric chloride acted as a noncompetitive inhibitor.
    • Phloretin and Tris showed mutually competitive inhibition, suggesting a common binding site.
    • Phlorizin binding differed from phloretin and Tris binding.
    • Mercuric chloride and beta-methylglucoside exhibited mutual competition, indicating proximity of SH-inhibitor and substrate binding sites.

    Conclusions:

    • Renal trehalase possesses distinct binding regions within its active site.
    • A model is proposed with separate glucosyl (phlorizin) and phenyl (phloretin) binding sites.
    • The substrate-binding site and the SH-inhibitor binding site are in close proximity.

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