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Related Experiment Videos

Internal motions in myosin. 2

S Highsmith, O Jardetzky

    Biochemistry
    |February 17, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Internal motions within myosin and its subfragment 1 (S1) are independent of protein tumbling. These mobile regions are protected from surface probes, suggesting an internal structure.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Protein Dynamics

    Background:

    • Myosin and its subfragment 1 (S1) are crucial for muscle contraction.
    • Understanding the internal dynamics of myosin is key to elucidating its function.

    Purpose of the Study:

    • To investigate the internal motions of myosin and S1.
    • To determine if these motions are influenced by overall protein tumbling or surface accessibility.

    Main Methods:

    • High-resolution proton nuclear magnetic resonance (1H NMR) spectroscopy.
    • Modulating protein tumbling rates via solvent viscosity and filament aggregation.
    • Probing protein surface accessibility using paramagnetic agents (nitroxide spin-labels and MnCl2).

    Main Results:

    Related Experiment Videos

    • Internal motions detected by 1H NMR in myosin and S1 were unaffected by changes in tumbling rate.
    • Surface-directed paramagnetic probes showed limited access to mobile regions.
    • Labeling specific thiol groups did not significantly alter the NMR spectrum, while multiple thiol labeling caused minor peak broadening.

    Conclusions:

    • Myosin exhibits internal motions independent of its overall rotational rate.
    • The mobile regions within S1 are likely located in the protein's interior.
    • Actin binding may quench these internal motions by inducing structural changes in myosin.