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Fluorescence polarization studies on myosin-substrate interaction.

K Kishi, H Noda

    Journal of Biochemistry
    |March 1, 1983
    PubMed
    Summary
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    The fluorescence polarization of myosin increases with ATP binding, indicating restricted tryptophan residue rotation. This effect is specific to MgATP and reverses as ATP is depleted.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Biophysics

    Background:

    • Myosin is a crucial motor protein involved in muscle contraction.
    • Intrinsic protein fluorescence, particularly from tryptophan residues, can report on protein structure and dynamics.
    • Understanding myosin's interaction with ATP is fundamental to muscle physiology.

    Purpose of the Study:

    • To investigate the effect of ATP binding on the intrinsic fluorescence polarization of purified myosin.
    • To explore the dynamics of myosin-ATP interaction using fluorescence polarization.
    • To elucidate the role of tryptophan residues in myosin's response to substrates.

    Main Methods:

    • Purification of myosin.
    • Measurement of intrinsic fluorescence polarization of myosin at different excitation wavelengths (>300 nm).

    Related Experiment Videos

  • Kinetic studies monitoring fluorescence intensity and polarization changes upon ATP addition and depletion.
  • Specificity testing with MgATP.

    • Main Results:

    • Intrinsic fluorescence polarization of myosin increased upon addition of ATP when excited at wavelengths >300 nm.
    • This increased polarization decayed as ATP was depleted, correlating with decreased fluorescence intensity.
    • The decay of polarization was specific to MgATP, suggesting a role for magnesium ions.
    • The findings suggest reduced local rotational freedom of specific myosin tryptophan residues upon substrate interaction.

    Conclusions:

    • ATP binding to myosin leads to a measurable increase in fluorescence polarization.
    • This polarization change is attributed to restricted rotation of specific tryptophan residues.
    • The interaction is specific to MgATP, highlighting the importance of divalent cations.
    • Fluorescence polarization serves as a sensitive probe for myosin-ATP interactions and conformational changes.