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Related Experiment Videos

Dynorphin converting enzyme with unusual specificity from rat brain.

L Devi, A Goldstein

    Proceedings of the National Academy of Sciences of the United States of America
    |March 1, 1984
    PubMed
    Summary

    Researchers discovered a novel thiol protease in rat brain membranes that cleaves leumorphin into dynorphin B. This enzyme, distinct from known proteases, may play a unique role in peptide processing.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Enzymology

    Background:

    • Dynorphin B is a biologically active peptide involved in various neurological functions.
    • The processing of dynorphin B from precursor peptides is not fully understood.
    • Previous studies have identified several proteases involved in opioid peptide metabolism.

    Purpose of the Study:

    • To identify and characterize the enzyme responsible for converting synthetic dynorphin B-29 (leumorphin) to dynorphin B in rat brain membranes.
    • To determine the enzymatic properties and specificity of this converting activity.

    Main Methods:

    • Incubation of synthetic dynorphin B-29 with rat brain membrane extract.
    • Product identification using immunoprecipitation with dynorphin B antiserum.
    • Analysis of product formation via reversed-phase high-performance liquid chromatography (RP-HPLC).
    • Enzyme characterization through pH optimum determination and inhibitor studies.

    Main Results:

    • A rat brain membrane extract converted synthetic dynorphin B-29 (leumorphin) to dynorphin B via a single arginine cleavage at Thr-Arg (positions 13-14).
    • The converting activity demonstrated a pH optimum of 8 and was sensitive to thiol protease inhibitors but not cathepsin B or serine protease inhibitors.
    • Dynorphin A inhibited the activity, while dynorphin A fragments did not, suggesting substrate specificity.

    Conclusions:

    • The converting activity is attributed to a novel thiol protease.
    • This protease is distinct from known proteases involved in biologically active peptide processing.
    • The findings suggest a new pathway for dynorphin B generation in the brain.

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