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Actin in Xenopus oocytes.

T G Clark, R W Merriam

    The Journal of Cell Biology
    |May 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Xenopus oocyte extracts form temperature-reversible actin-based gels upon warming, requiring sucrose and calcium. These gels contract in an ATP-dependent manner, involving myosin heavy chain-like polypeptides.

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    Area of Science:

    • Cell Biology
    • Biochemistry
    • Developmental Biology

    Background:

    • Xenopus oocytes are a valuable model for studying fundamental cellular processes.
    • Understanding protein interactions and assembly in oocytes is crucial for developmental studies.

    Purpose of the Study:

    • To investigate the properties of a gel-forming supernatant fraction from Xenopus oocytes.
    • To identify the protein components responsible for gelation and contraction.

    Main Methods:

    • High-speed centrifugation of Xenopus oocyte extracts.
    • Gelation assays at varying temperatures and sucrose concentrations.
    • SDS-polyacrylamide gel electrophoresis (SDS-PAGE) for protein analysis.
    • Ultrastructural and immunological techniques for protein identification.

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    Main Results:

    • A temperature-reversible gel forms from Xenopus oocyte extracts upon warming (18-40°C) in the presence of sucrose.
    • The primary gel component is a 43-kDa protein identified as Xenopus actin, along with a ~250-kDa high molecular weight component.
    • Gel contraction is ATP-dependent and involves myosin heavy chain-like polypeptides, which are absent in contracted gels.
    • Calcium ions (Ca++) are essential for gelation, with inhibition observed at both low and high Ca++ concentrations.

    Conclusions:

    • Xenopus oocyte extracts contain an actin-based gel system sensitive to temperature, sucrose, ATP, and calcium.
    • The gel exhibits temperature-reversible gelation and ATP-dependent contraction, suggesting a dynamic cytoskeletal-like behavior.
    • This system provides insights into the regulation of actin and myosin interactions in a developmental context.