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Related Experiment Videos

ATP binding and crossbridge structure in muscle.

M L Clarke, W Hofman, J S Wray

    Journal of Molecular Biology
    |October 5, 1986
    PubMed
    Summary

    Insect flight muscle myosin alone shows nucleotide-dependent structural changes, similar to intact muscle. This suggests the power-stroke involves myosin head interactions with both thick and thin filaments.

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    Area of Science:

    • Muscle physiology
    • Biochemistry
    • Molecular motor function

    Background:

    • Actin-myosin crossbridge cycling is fundamental to muscle contraction.
    • Nucleotide binding to myosin is known to regulate crossbridge states.
    • The precise structural changes of myosin during the power-stroke are not fully elucidated.

    Purpose of the Study:

    • To investigate if myosin alone, independent of actin, exhibits nucleotide-dependent structural changes.
    • To determine if myosin's structural rearrangements are responsible for the power-stroke mechanism.
    • To explore the role of myosin head orientation in muscle force generation.

    Main Methods:

    • Extraction of thick filaments from insect flight muscle.
    • Analysis of crossbridge arrangement under varying nucleotide conditions (ATP vs. rigor).
    • Comparison of structural periodicity in isolated thick filaments versus intact muscle fibers.

    Main Results:

    • Insect flight muscle myosin exhibits a periodic crossbridge arrangement in the presence of ATP, mimicking relaxed muscle.
    • This ordered arrangement is reversibly lost under rigor-inducing conditions.
    • Myosin's structural state is dependent on nucleotide binding, even in isolation.

    Conclusions:

    • Myosin's structural plasticity is key to the power-stroke mechanism.
    • The power-stroke likely involves alterations in the myosin head's steric relationship with both thick and thin filaments.
    • Myosin's intrinsic nucleotide-dependent conformational changes contribute significantly to muscle contraction.

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