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Related Experiment Videos

Angiotensin I converting enzyme from human plasma.

J J Lanzillo, B L Fanburg

    Biochemistry
    |December 13, 1977
    PubMed
    Summary

    Researchers purified human plasma angiotensin I converting enzyme, revealing its acidic glycoprotein nature and key inhibitors. This enzyme plays a role in cleaving bradykinin and angiotensin II.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Angiotensin I converting enzyme (ACE) is crucial in the renin-angiotensin system.
    • Understanding ACE's properties is vital for pharmacological interventions.

    Purpose of the Study:

    • To purify and characterize human plasma angiotensin I converting enzyme.
    • To determine the enzyme's biochemical properties and substrate specificity.

    Main Methods:

    • Purification using chromatographic and electrophoretic techniques.
    • Characterization of molecular weight, isoelectric point, and cofactor requirements.

    Main Results:

    • Achieved 101,000-fold purification of human plasma ACE to homogeneity.
    • Identified the enzyme as an acidic glycoprotein (140,000 MW, pI 4.6).
    • Demonstrated requirement for chloride ions and inhibition by specific compounds (e.g., EDTA, SQ-14,225).

    Conclusions:

    • The purified human plasma ACE shares properties with other known ACEs.
    • The enzyme effectively cleaves bradykinin, angiotensin II, and hippuryl-L-histidyl-L-leucine.

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