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Extracellular and protease-released pullulanases

C J Brandt, B J Catley, W M Awad

    Journal of Bacteriology
    |February 1, 1976
    PubMed
    Summary
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    Researchers purified extracellular and cell-bound pullulanase (EC 3.2.1.41) from Klebsiella aerogenes. Different forms exhibit distinct properties, suggesting a single gene product generates these variations via protease cleavage.

    Area of Science:

    • Enzymology
    • Microbial Biochemistry

    Background:

    • Pullulanase (EC 3.2.1.41) is an extracellular enzyme from Klebsiella aerogenes.
    • Understanding different enzyme forms is crucial for biochemical applications.

    Purpose of the Study:

    • To purify and characterize extracellular and cell-bound pullulanase from Klebsiella aerogenes.
    • To compare the properties of different pullulanase forms.

    Main Methods:

    • Purification of extracellular pullulanase using diethylaminoethyl-cellulose, Sephadex G-200, and 1,6-diaminohexane-Sepharose chromatography.
    • Release and purification of cell-bound pullulanase via Pronase-derived serine endopeptidase.
    • Characterization of enzyme forms by amino acid composition, specific activity, molecular weight, and inhibition patterns.

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    Main Results:

    • Extracellular pullulanase was purified to homogeneity.
    • Cell-bound pullulanase was released and purified, showing higher specific activity and molecular weight than the extracellular form.
    • Distinct properties were observed among extracellular, protease-released, and detergent-released pullulanase forms.

    Conclusions:

    • Different pullulanase forms possess unique biochemical characteristics.
    • A single gene product is hypothesized to generate these diverse enzyme forms through selective protease cleavage.