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[Interactions between various transition elements in their effect on pepsin activity]

H Steinhart, M Kirchgessner, M G Beyer

    Archiv Fur Tierernahrung
    |September 1, 1976
    PubMed
    Summary
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    Copper (Cu2+) ions significantly activate pepsin enzyme activity. The effects of other metal ions like iron (Fe2+), nickel (Ni2+), and zinc (Zn2+) on this activation were also investigated.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Metalloprotein interactions

    Context:

    • Pepsin is a key digestive enzyme.
    • Metal ions can modulate enzyme function.
    • Understanding these interactions is crucial for biochemical research.

    Purpose:

    • To investigate the effect of Cu2+ ions on pepsin activity.
    • To determine the influence of co-administered Fe2+, Ni2+, or Zn2+ ions on Cu2+-induced pepsin activation.

    Summary:

    • Kinetic experiments demonstrated that Cu2+ ions (5-10(-4) M) significantly activate pepsin, with haemoglobin as the substrate.
    • Co-administration of Fe2+ ions showed an additive activation effect with Cu2+.
    • Ni2+ ions exhibited a competitive effect with Cu2+ ions, while Zn2+ ions did not alter the Cu2+-mediated activation.

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    Impact:

    • This study elucidates the complex role of specific metal cations in modulating pepsin kinetics.
    • Findings contribute to the understanding of enzyme-metal ion interactions in biological systems.
    • Provides insights for potential applications in enzyme engineering or therapeutic strategies involving pepsin modulation.