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Related Experiment Videos

Novel substrates for angiotensin I converting enzyme.

L B Hersh, J T Gafford, J C Powers

    Biochemical and Biophysical Research Communications
    |January 27, 1983
    PubMed
    Summary

    Human angiotensin converting enzyme (ACE) can hydrolyze substrates without a free carboxyl group. This finding challenges previous understanding of ACE substrate specificity and enzyme kinetics.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Angiotensin converting enzyme (ACE) is a key enzyme in the renin-angiotensin system.
    • ACE typically cleaves dipeptides from the C-terminus of substrates with a free carboxyl group.

    Purpose of the Study:

    • To investigate if ACE can hydrolyze substrates lacking a free carboxyl group.
    • To characterize the hydrolysis of novel substrates by ACE.

    Main Methods:

    • Enzyme kinetics assays using peptides with C-terminal nitrobenzylamine.
    • Inhibition studies with captopril, MK421, and anti-ACE antibody.
    • Product identification using thin-layer chromatography (TLC) and high-performance liquid chromatography (HPLC).

    Main Results:

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    • ACE hydrolyzed peptides containing a C-terminal nitrobenzylamine.
    • Hydrolysis was inhibited by specific ACE inhibitors and antibody.
    • Sodium chloride significantly accelerated the hydrolysis rate (40-fold).
    • Product (amino acid nitrobenzylamide) was successfully identified.

    Conclusions:

    • The carboxyl group is not an absolute requirement for ACE substrate hydrolysis.
    • ACE exhibits broader substrate specificity than previously understood.
    • These findings have implications for understanding ACE function and inhibitor design.