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(2')3',5'-Bisphosphate nucleotidase.

S G Ramaswamy, W B Jakoby

    The Journal of Biological Chemistry
    |July 25, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Researchers purified a novel guinea pig liver enzyme, (2')3',5'-Bisphosphate nucleotidase, which hydrolyzes specific phosphate groups from nucleosides and is essential for cellular processes. This enzyme requires magnesium ions for its catalytic activity.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Nucleoside bisphosphates play crucial roles in cellular signaling and metabolism.
    • Specific enzymes are required to regulate the levels of these phosphorylated compounds.

    Purpose of the Study:

    • To isolate and characterize a novel nucleotidase enzyme from guinea pig liver.
    • To elucidate the substrate specificity and catalytic requirements of the purified enzyme.

    Main Methods:

    • Electrophoretic purification of the enzyme from guinea pig liver homogenate.
    • Enzyme activity assays using various nucleoside bisphosphates, phosphosulfates, and coenzymes.
    • Determination of protein molecular weight and quaternary structure.

    Main Results:

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    • The (2 ')3 ',5 '-Bisphosphate nucleotidase was purified to electrophoretic homogeneity.
    • The enzyme specifically hydrolyzes the 2 '- or 3 '-phosphate from nucleoside 2 ',5 '- and 3 ',5 '-bisphosphates.
    • Activity was observed with 3 '-phosphoadenosine 5 '-phosphosulfate and coenzyme A, but not with ATP.
    • The enzyme is a 40,000-dalton monomer and requires Mg2+ for activity.

    Conclusions:

    • A novel bisphosphate nucleotidase from guinea pig liver has been characterized.
    • The enzyme exhibits specific substrate preferences, indicating a role in regulating particular metabolic pathways.
    • The Mg2+-dependent monomeric nature of the enzyme provides insights into its catalytic mechanism.