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A protease from rat intestine.

K Wada, Y Sawai, K Tsukada

    Biochimica Et Biophysica Acta
    |March 14, 1980
    PubMed
    Summary
    This summary is machine-generated.

    A novel protease from rat intestine inactivates ribonuclease H and other enzymes. This serine protease, purified to homogeneity, has a molecular weight of 28,000 and a trypsin-like activity.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Ribonuclease H plays a critical role in RNA degradation within cellular processes.
    • Enzymatic regulation of ribonuclease H activity is essential for maintaining cellular homeostasis.

    Purpose of the Study:

    • To isolate and characterize a factor from rat intestine that inactivates ribonuclease H.
    • To determine the enzymatic nature and properties of the identified inactivating factor.

    Main Methods:

    • Enzyme purification to homogeneity using biochemical assays.
    • Determination of molecular weight, optimal pH, and isoelectric point.
    • Characterization of enzymatic activity using various substrates and inhibitors, including diisopropylphosphorofluoridate.

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    Main Results:

    • A protease with molecular weight 28,000, optimal pH 8.0, and pI 4.5-4.7 was purified.
    • The protease exhibited parallel inactivating and proteolytic activities.
    • Inactivation of deoxyribonuclease I, pyruvate kinase, and aldolase was observed.
    • The enzyme was identified as a serine protease with trypsin-like characteristics.

    Conclusions:

    • A novel rat intestinal serine protease capable of inactivating ribonuclease H and other enzymes has been purified and characterized.
    • This protease demonstrates trypsin-like specificity and is inhibited by diisopropylphosphorofluoridate.
    • The findings provide insights into enzymatic regulation of ribonuclease H activity.