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A pepsinogen from dog stomach.

S S Twining, K Huibregtse, D M Glick

    Comparative Biochemistry and Physiology. B, Comparative Biochemistry
    |January 1, 1983
    PubMed
    Summary

    Researchers purified dog pepsinogen, finding it converts to pepsin below pH 4. This pepsinogen is more stable than pepsin, with equal proteolytic but lower milk-clotting activity.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Proteolysis

    Background:

    • Pepsinogen is the inactive precursor to pepsin, a key digestive enzyme.
    • Understanding pepsinogen's properties is crucial for studying gastric digestion and related disorders.

    Purpose of the Study:

    • To purify and characterize pepsinogen from canine gastric tissue.
    • To compare the stability and enzymatic activity of dog pepsinogen and its active form, pepsin, with known standards.

    Main Methods:

    • Pepsinogen was purified from dog stomach with a reported yield of 20%.
    • Spontaneous conversion to pepsin was studied at pH values below 4.
    • Stability against denaturation was assessed at various pH levels.
    • Proteolytic and milk-clotting activities were quantified and compared to pig pepsin.

    Main Results:

    • Purified dog pepsinogen spontaneously converted to pepsin at pH < 4, with a rate constant of 11 min⁻¹ at pH 2 and 22°C.
    • Dog pepsinogen demonstrated stability up to pH 9, whereas pepsin denatured irreversibly above pH 7.
    • Proteolytic activity against denatured hemoglobin was equivalent to pig pepsin.
    • Milk-clotting activity at pH 5.5 was only 14% of that of pig pepsin.

    Conclusions:

    • Dog pepsinogen exhibits distinct stability characteristics compared to its active pepsin form.
    • The enzyme possesses significant proteolytic potential but limited milk-clotting ability, suggesting specific functional roles.

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