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Actin and the actomyosin interface: a review

C G dos Remedios1, P D Moens

  • 1Department of Anatomy and Histology, University of Sydney, Australia.

Biochimica Et Biophysica Acta
|March 14, 1995
PubMed
Summary

This review examines actin filament structure and myosin binding sites. It analyzes evidence to propose an actin-centered model for myosin interaction, detailing the transition to the rigor state.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Actin monomers assemble into filaments, crucial for cellular processes.
  • The precise arrangement of actin monomers in filaments and myosin binding sites remain areas of active research.
  • Two models exist for actin filament structure, differing in monomer domain orientation.

Purpose of the Study:

  • To review and analyze evidence for different actin filament models.
  • To identify loci on F-actin involved in myosin binding.
  • To elucidate the sequence of events in actin-myosin interaction.

Main Methods:

  • Analysis of X-ray diffraction and electron microscopy data.
  • Spectroscopic techniques including FRET and NMR.
  • Biochemical methods such as cross-linking, proteolysis, and mutagenesis.

Main Results:

  • Evidence supports an actin-centered view of myosin binding sites.
  • Multiple contact points between actin and myosin are identified.
  • A model for the transition from weak to strong actin-myosin binding is proposed.

Conclusions:

  • The study provides a comprehensive overview of actin filament structure and myosin interaction.
  • Identified loci on actin are critical for myosin binding and force generation.
  • Understanding these interactions is key to deciphering muscle contraction and cell motility.

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