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Related Experiment Videos

A fluorometric assay for angiotensin-converting enzyme activity.

M S Kapiloff, S M Strittmatter, L D Fricker

    Analytical Biochemistry
    |July 1, 1984
    PubMed
    Summary

    A new assay accurately measures angiotensin-converting enzyme (ACE) activity using fluorescently labeled peptides. This method is sensitive and suitable for clinical and research applications involving ACE.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Angiotensin-converting enzyme (ACE) plays a crucial role in cardiovascular regulation.
    • Existing assays for ACE activity may lack sensitivity or simplicity for certain applications.

    Purpose of the Study:

    • To develop a simple, sensitive, and reliable assay for measuring angiotensin-converting enzyme (ACE) activity.
    • To validate the assay's specificity and utility in biological samples.

    Main Methods:

    • Development of a novel assay employing fluorescently labeled tripeptide substrates (e.g., dansylphenylalanyl-arginyl-tryptophan).
    • Utilized chloroform partitioning to separate the fluorescent product (dansyl-phenylalanine) from substrates.
    • Validated enzyme activity using inhibition studies, product identification, and tissue distribution analysis.

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    Main Results:

    • The developed assay demonstrated high sensitivity and signal-to-noise ratios, even with small human serum volumes.
    • Specificity was confirmed, showing that only ACE cleaves the substrates under the employed conditions.
    • The assay successfully measured ACE activity in human serum and various rat tissues.

    Conclusions:

    • A novel, sensitive, and specific fluorescent assay for ACE activity has been established.
    • This assay is suitable for both clinical measurements of human serum ACE and research on ACE from diverse tissues.