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Enterokinase (enteropeptidase): comparative aspects.

A Light, H Janska

    Trends in Biochemical Sciences
    |March 1, 1989
    PubMed
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    Enterokinase, a serine protease, activates trypsinogen with high specificity. Its structure and function suggest evolutionary links to blood-clotting enzymes.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Enterokinase is a serine protease crucial for activating trypsinogen.
    • It exhibits a specific recognition sequence: (Asp)4-Lys-Ile.
    • The enzyme comprises two disulfide-linked subunits: a heavy chain and a light chain.

    Purpose of the Study:

    • To elucidate the structural and functional characteristics of enterokinase.
    • To investigate the enzymatic mechanism and substrate specificity of enterokinase.
    • To explore the phylogenetic relationship of enterokinase with other proteases.

    Main Methods:

    • Biochemical assays to determine enzyme activity and specificity.
    • Structural analysis of enterokinase subunits.
    • Comparative analysis of enterokinase properties with blood-clotting enzymes.

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    Main Results:

    • Enterokinase specifically cleaves trypsinogen at the (Asp)4-Lys-Ile sequence.
    • The heavy chain anchors the enzyme to the intestinal brush border membrane.
    • The light chain possesses catalytic activity similar to trypsin and chymotrypsin.

    Conclusions:

    • Enterokinase plays a vital role in digestive enzyme activation.
    • Its unique structure facilitates membrane anchoring and catalytic function.
    • Enterokinase shares significant properties with blood-clotting enzymes, indicating a common evolutionary origin.