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Actin dynamics studied by solid-state NMR spectroscopy.

L Phillips1, F Separovic, B A Cornell

  • 1Department of Anatomy, University of Sydney, N.S.W., Australia.

European Biophysics Journal : EBJ
|January 1, 1991
PubMed
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Solid-state nuclear magnetic resonance spectroscopy revealed restricted motion for probes on actin, with local environment significantly influencing dynamics. Probe size impacted G-actin motion, sensing monomer rotation, unlike in F-actin.

Area of Science:

  • Biophysics
  • Structural Biology
  • Spectroscopy

Background:

  • Skeletal muscle actin is a crucial protein involved in muscle contraction and cellular motility.
  • Understanding actin dynamics at a molecular level is essential for elucidating its various functions.
  • Previous studies have utilized spectroscopic techniques to probe protein dynamics, but solid-state NMR offers unique insights into restricted environments.

Purpose of the Study:

  • To investigate the molecular motion of actin using solid-state nuclear magnetic resonance (NMR) spectroscopy.
  • To examine the influence of different actin forms (G-actin, F-actin) and myosin binding on probe dynamics.
  • To correlate probe motion with specific actin residues and understand the impact of probe size and local environment.

Main Methods:

Related Experiment Videos

  • Solid-state nuclear magnetic resonance (NMR) spectroscopy was employed.
  • Deuterium (2H) and fluorine-19 (19F) probes were attached to specific actin residues (Cys-10, Lys-61, Cys-374).
  • Spectroscopic analysis was performed on dried and hydrated G-actin, F-actin, and F-actin-myosin subfragment-1 complexes.

    • Main Results:

    • Restricted motion was observed for 19F probes at Cys-10 and Cys-374 on actin.
    • Probe dynamics in dry cysteine powder and F-actin were similar, indicating the local environment's dominant role in solid-state motion.
    • Myosin binding had minimal effect on probe dynamics, suggesting local interactions are key.
    • Rapid internal motions, such as domain twisting, were detected in both G-actin and F-actin.
    • Probe size influenced motion in G-actin, potentially sensing monomer rotation, but not in F-actin, where segmental mobility and intramonomer coordination were dominant.

    Conclusions:

    • Solid-state NMR reveals that the local environment significantly dictates probe motion on actin, especially in the solid state.
    • Actin exhibits rapid internal motions, including domain twisting, irrespective of its monomeric or polymeric form.
    • The dynamics of actin are distinct between G-actin and F-actin, with probe size playing a role in G-actin but not F-actin, highlighting differences in segmental mobility and coordination.