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Self-assembly pathway of nonsarcomeric myosin II.

R A Cross1, T P Hodge, J Kendrick-Jones

  • 1MRC Laboratory of Molecular Biology, Cambridge, UK.

Journal of Cell Science. Supplement
|January 1, 1991
PubMed
Summary

Myosin filament self-assembly controls cell force generation. Unfolding rates of looped myosin molecules in vitro determine filament number and length, revealing a key mechanism for actomyosin regulation.

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Area of Science:

  • Cell biology
  • Biochemistry
  • Biophysics

Background:

  • Actomyosin-dependent force generation is crucial for cellular functions.
  • Myosin filament self-assembly is a primary regulatory mechanism for this force generation.
  • The precise mechanism governing myosin self-assembly remains largely unelucidated.

Purpose of the Study:

  • To investigate the mechanism of myosin filament self-assembly.
  • To identify key factors regulating myosin self-assembly in vitro.
  • To understand how myosin self-assembly influences filament characteristics.

Main Methods:

  • In vitro studies of myosin molecule self-assembly.
  • Analysis of the role of the C-terminal domain in self-assembly.
  • Investigating the impact of molecular folding and unfolding dynamics.

Main Results:

  • Myosin filament self-assembly in vitro requires a specific C-terminal domain.
  • Molecular folding into a compact, looped state suppresses the availability of this domain.
  • The rate of unfolding of these looped myosin molecules is a critical determinant of filament number and length.

Conclusions:

  • Myosin filament self-assembly is regulated by the accessibility of its C-terminal domain.
  • The dynamics of myosin molecule unfolding play a pivotal role in controlling filament formation.
  • Understanding these mechanisms provides insight into actomyosin-dependent cellular force generation.

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