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Related Experiment Videos

Tryptic action across a membrane.

A Rothen

    Physiological Chemistry and Physics
    |January 1, 1979
    PubMed
    Summary

    Enzymatic action, like trypsin

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    The Journal of experimental medicine·2009

    Area of Science:

    • Biochemistry
    • Enzymology
    • Surface Chemistry

    Background:

    • Enzymatic reactions often require direct contact between enzyme and substrate.
    • Previous hypotheses on enzyme action across membranes have been debated.
    • Understanding enzyme-substrate interactions is crucial in biological and chemical processes.

    Purpose of the Study:

    • To investigate whether trypsin can exhibit enzymatic activity without crossing a membrane.
    • To re-evaluate the mechanism of enzyme action at a distance.
    • To explore the potential for immobilizing biomolecules across membranes.

    Main Methods:

    • Adsorbing bovine serum albumin (BSA) onto a nickel-plated slide.
    • Protecting the BSA layer with a 120 Å thick Formvar membrane.
    • Treating the system with a dilute trypsin solution and observing the reaction.

    Main Results:

    • Tryptic action was observed on the BSA layer.
    • Experimental evidence confirmed that trypsin molecules did not penetrate the Formvar membrane.
    • This supports the hypothesis of enzyme action without direct contact.

    Conclusions:

    • Enzymes can exert catalytic effects across semi-permeable membranes.
    • The 'forced diffusion' hypothesis is supported, suggesting enzymes can act at a distance.
    • This principle may be applicable to immobilizing other biomolecules, such as antibodies and antigens, across membranes.

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