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Cross-bridge properties in the rigor state

R J Podolsky, G R Naylor, T Arata

    Society of General Physiologists Series
    |January 1, 1982
    PubMed
    Summary
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    The myosin S1 moiety

    Area of Science:

    • Muscle contraction and biomechanics.
    • Biophysics of protein-actin interactions.

    Background:

    • The structure and function of myosin S1 and actin filaments are crucial for muscle contraction.
    • Previous assumptions suggested a longer linkage between myosin S1 and the myosin filament.

    Purpose of the Study:

    • To investigate the stability of the S1 attachment angle to actin filaments.
    • To determine the precise length of the linkage connecting the S1 moiety to the myosin filament.

    Main Methods:

    • Analyzing equatorial diffraction patterns of rigor fibers under applied strain.
    • Measuring fiber length and force variations with changes in lattice spacing.

    Main Results:

    • Applied strain did not alter the equatorial diffraction pattern, confirming stable S1 attachment to actin.

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  • The linkage between the S1 moiety and the myosin filament was found to be 3-12 nm.
  • This determined linkage length is significantly shorter than the previously assumed 60 nm.

    • Conclusions:

    • The S1 attachment angle to actin is highly stable during muscle contraction.
    • The myosin filament's structure includes a shorter than expected linkage for the S1 moiety, impacting models of muscle mechanics.