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Related Experiment Videos

The first cleavage site in pepsinogen activation.

J Kay, C W Dykes

    Advances in Experimental Medicine and Biology
    |January 1, 1977
    PubMed
    Summary

    Pepsinogens and prochymosin activation involves sequential mechanisms, not one-step conversions. Pepstatin trapping reveals distinct activation peptides for pepsin and chymosin formation.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Protein Chemistry

    Background:

    • Pepsinogens and prochymosin are inactive precursors to digestive enzymes pepsin and chymosin.
    • Understanding zymogen activation is crucial for comprehending digestive physiology and enzyme function.

    Purpose of the Study:

    • To investigate the activation mechanisms of various pepsinogens and prochymosin.
    • To identify the initial steps and intermediates in the conversion of zymogens to active enzymes.

    Main Methods:

    • Incubation of porcine, bovine, canine, and chicken pepsinogens, along with calf prochymosin, with pepstatin at pH 2.5.
    • Analysis of activation peptides released during the process to elucidate sequential activation pathways.

    Main Results:

    • Pepstatin trapped the first active protein generated during activation in an inactive complex.
    • The activation peptide from porcine pepsinogen was identified as residues 1-16.
    • The activation peptide from prochymosin was identified as residues 1-27.

    Conclusions:

    • Pepsin and chymosin are not formed by single-step conversions from their zymogens.
    • The activation of pepsinogen and prochymosin proceeds via distinct, sequential mechanisms.

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