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Related Experiment Videos

Human cathepsin H.

W N Schwartz, A J Barrett

    The Biochemical Journal
    |November 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Researchers purified human liver cathepsin H, a glycoprotein enzyme, alongside cathepsins B and D. Cathepsin H exhibits distinct substrate specificity and isoelectric forms, differing from cathepsin B.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Human Physiology

    Background:

    • Cathepsins are crucial lysosomal cysteine proteases involved in protein degradation.
    • Understanding the specific properties of human cathepsin H is essential for its role in cellular processes.

    Purpose of the Study:

    • To purify and characterize human liver cathepsin H.
    • To investigate its enzymatic activity, substrate specificity, and physical properties.

    Main Methods:

    • Purification involved autolysis, acetone fractionation, and multiple chromatography techniques (DEAE-cellulose, Ultrogel AcA 54, hydroxyapatite, concanavalin A-Sepharose).
    • Enzyme activity was assessed using substrates like azocasein and naphthylamide derivatives.
    • Isoelectric focusing and molecular weight determination were performed.

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    Main Results:

    • Cathepsin H was isolated as a single polypeptide chain (28,000 mol.wt.) and identified as a glycoprotein.
    • The enzyme displayed multiple isoelectric forms (major pI 6.0 and 6.4) and hydrolyzed azocasein and specific naphthylamide substrates.
    • Cathepsin H showed distinct substrate preferences compared to cathepsin B and was inactivated by alkaline pH.

    Conclusions:

    • Human liver cathepsin H is a glycoprotein with unique enzymatic and physical characteristics.
    • The purification method allowed for the simultaneous isolation of cathepsins B and D.
    • Cathepsin H's properties differentiate it from other lysosomal cysteine proteinases like cathepsin B.