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Related Experiment Videos

Post-proline endopeptidase in human placenta.

S Mizutani, S Sumi, O Suzuki

    Biochimica Et Biophysica Acta
    |April 27, 1984
    PubMed
    Summary

    Human placental post-proline endopeptidase was purified and characterized. This thiol proteinase, distinct from dipeptidyl peptidase IV, has a pH optimum of 6.7 and a dimeric structure.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Post-proline endopeptidase (EC 3.4.21.26) is an enzyme found in human tissues.
    • Characterizing its properties is crucial for understanding its biological roles.

    Purpose of the Study:

    • To purify and characterize human placental post-proline endopeptidase.
    • To differentiate it from other related enzymes like dipeptidyl peptidase IV (EC 3.4.14.5).

    Main Methods:

    • Purification using hydrophobic phenyl-Sepharose chromatography.
    • Enzyme characterization including pH optimum, Km determination, molecular weight estimation (gel filtration and SDS-PAGE), and inhibition studies.

    Main Results:

    • Achieved a 3390-fold purification of the enzyme.
    • Successfully separated post-proline endopeptidase from dipeptidyl peptidase IV.
    • Determined a pH optimum of 6.7 and a Km of 1.0 mM for 7-(Succinyl-Gly-Pro)-4-methylcoumarinamide.
    • Estimated molecular weight indicated a dimeric structure (140,000 by gel filtration, 67,000 by SDS-PAGE).
    • Inhibition studies suggested the enzyme is a thiol proteinase.

    Conclusions:

    • Human placental post-proline endopeptidase is a distinct thiol proteinase.
    • Its dimeric structure and specific kinetic properties provide insights into its function.

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