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Related Experiment Videos

Angiotensin-converting enzyme: immunologic, structural, and developmental aspects.

R L Soffer, H A El-Dorry

    Federation Proceedings
    |July 1, 1983
    PubMed
    Summary
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    Active immunization with related enzymes can create inhibitors for circulating enzymes like angiotensin-converting enzyme. Researchers found distinct molecular properties and pretranslational regulation between lung and testicular angiotensin-converting enzyme isozymes.

    Area of Science:

    • Biochemistry
    • Immunology
    • Enzymology

    Background:

    • Angiotensin-converting enzyme (ACE) plays a crucial role in the circulatory system.
    • Developing biologically based inhibitors for circulating enzymes is a significant therapeutic goal.

    Purpose of the Study:

    • To investigate the feasibility of using active immunization with related enzymes to generate enzyme inhibitors.
    • To characterize and compare rabbit pulmonary and testicular angiotensin-converting enzyme isozymes.

    Main Methods:

    • Purification of rabbit testicular peptidyldipeptide hydrolase.
    • Antibody generation via immunization with purified enzymes.
    • Enzyme activity assays and competition radioimmunoassays.
    • Analysis of protein synthesis using reticulocyte lysate and mRNA from different rabbit tissues.

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    Main Results:

    • Antibodies raised against rabbit pulmonary ACE inhibited both pulmonary and testicular ACE.
    • Rabbit testicular ACE is a smaller glycoprotein (Mr ~100,000) than pulmonary ACE (Mr ~140,000).
    • Testicular ACE synthesis is maturation-dependent and results in a smaller polypeptide chain, suggesting pretranslational regulation.

    Conclusions:

    • Active immunization with immunologically related enzymes is a viable strategy for developing enzyme inhibitors.
    • Pulmonary and testicular ACE isozymes exhibit distinct structural and regulatory properties determined at the pretranslational level.
    • The testicular isozyme appears to represent an internal segment of the pulmonary enzyme, including the active site.