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Ecto-ATPase.

R K Banerjee

    Molecular and Cellular Biochemistry
    |July 7, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified an ecto-adenosine triphosphatase (ATP-phosphohydrolase) on cell membranes, distinct from energy-related ATPases. This enzyme exhibits broad substrate specificity and requires specific metal ions for activity.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Enzymology

    Background:

    • Cell membranes possess various enzymes, including ATPases involved in energy and transport.
    • The precise roles of ecto-enzymes on the cell surface are not fully elucidated.

    Purpose of the Study:

    • To characterize an ecto-adenosine triphosphatase (ATP-phosphohydrolase) located on the outer surface of cell membranes.
    • To differentiate this ecto-enzyme from intracellular ATPases involved in energy transduction and ion transport.

    Main Methods:

    • Enzyme localization studies on various cell membranes.
    • Biochemical assays to determine substrate specificity, cofactor requirements, and inhibitor sensitivity.
    • Comparison with known mitochondrial and Na+-K+-ATPase inhibitors.

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    Main Results:

    • An ecto-adenosine triphosphatase (E.C. 3.6.1.4 ATP-phosphohydrolase) was confirmed on the outer cell membrane surface.
    • The enzyme demonstrated broad substrate specificity and was inhibited by EDTA and high ATP concentrations.
    • Activity was dependent on bivalent metal ions (Mg++ or Ca++) and sensitive to SH-reagents, but not to mitochondrial or Na+-K+-ATPase inhibitors.

    Conclusions:

    • The identified ecto-ATPase is biochemically distinct from ATPases involved in cellular energy metabolism and ion transport.
    • Its unique characteristics suggest specialized functions related to extracellular ATP hydrolysis.
    • Further investigation into the functional roles of this ecto-enzyme on the cell surface is warranted.