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Related Experiment Videos

Actin-activated ATPase from human erythrocytes.

N Avissar, A de Vries, Y Ben-Shaul

    Biochimica Et Biophysica Acta
    |January 14, 1975
    PubMed
    Summary

    Researchers isolated a fibrillar protein complex from human erythrocyte membranes with calcium-dependent ATPase activity. This complex contains a myosin-like protein, suggesting a role in cellular processes beyond ion transport.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Membrane Proteins

    Background:

    • Human erythrocyte membranes contain various protein complexes involved in cellular functions.
    • Calcium-dependent ATPase (Ca2+-ATPase) activity is crucial for ion transport and cellular signaling.
    • Myosin-like proteins are typically associated with muscle contraction but can be found in non-muscle cells.

    Purpose of the Study:

    • To isolate and characterize a fibrillar protein complex from human erythrocyte membranes.
    • To investigate the enzymatic activities, specifically Ca2+-ATPase and Mg2+-ATPase, of the isolated complex.
    • To identify the protein components and their potential roles within the erythrocyte membrane.

    Main Methods:

    • Low ionic strength extraction of human erythrocyte membranes.
    • Biochemical assays for Ca2+-ATPase and actin-activated Mg2+-ATPase activity.
    • Sodium dodecylsulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for protein subunit analysis.
    • Gel filtration chromatography (Sepharose 4B) for protein fractionation.
    • In vitro protein phosphorylation assays.

    Main Results:

    • A fibrillar protein complex with ouabain-insensitive Ca2+-ATPase activity was successfully isolated.
    • The presence of a myosin-like protein was indicated by actin-activated Mg2+-ATPase activity in the crude extract.
    • SDS-PAGE revealed major protein bands at 230,000 and 210,000 molecular weight, along with other bands.
    • Gel filtration yielded four fractions; Fraction I showed purified Ca2+-ATPase activity but lacked actin-activated Mg2+-ATPase activity.
    • The 210,000 molecular weight protein subunit was phosphorylated in the crude extract and Fraction I, but not in Fraction II.

    Conclusions:

    • Human erythrocyte membranes possess a fibrillar protein complex with Ca2+-ATPase activity, distinct from known ion pumps.
    • The complex contains a myosin-like protein, suggesting potential roles in membrane dynamics or cytoskeletal interactions.
    • The 210,000 subunit appears to be a key component of the Ca2+-ATPase activity and is capable of phosphorylation.

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