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Ca-inhibitory myosins: their structure and function.

K Kohama1

  • 1Department of Pharmacology, Faculty of Medicine, University of Tokyo, Japan.

Advances in Biophysics
|January 1, 1987
PubMed
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Calcium ions inhibit Physarum actomyosin function through myosin binding. A novel calcium-dependent factor interacting with actin further regulates this system, suggesting broader implications for cellular processes.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Muscle Physiology

Background:

  • The actin-myosin-ATPase interaction in Physarum is regulated by calcium ions.
  • Calcium binding to myosin inhibits this interaction, while calcium release removes inhibition.

Purpose of the Study:

  • To investigate the regulatory mechanisms of actin-myosin interaction in Physarum.
  • To identify factors beyond myosin-linked control that influence contraction.

Main Methods:

  • The study focuses on the biochemical and physiological analysis of the Physarum actomyosin system.
  • Investigated calcium's role in regulating myosin and actin interactions.

Main Results:

  • Myosin-linked calcium control alone is insufficient to explain in vivo contraction.

Related Experiment Videos

  • A novel calcium-dependent inhibitory factor, similar to Ca-Lc, augments regulation by interacting with actin.
  • This regulatory system may extend to other actomyosin-related processes like secretion and motility.

    • Conclusions:

    • Physarum employs a dual regulatory system for actomyosin function involving both myosin-linked and actin-interacting calcium-dependent inhibition.
    • This inhibitory calcium control mechanism might be conserved across eukaryotes, impacting various cellular processes.