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Related Experiment Videos

Evidence for cleft closure in actomyosin upon ADP release.

N Volkmann1, D Hanein, G Ouyang

  • 1The Burnham Institute, La Jolla, California 92037, USA.

Nature Structural Biology
|December 2, 2000
PubMed
Summary

Smooth muscle myosin

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Motors

Background:

  • Understanding the molecular mechanisms of muscle contraction is crucial.
  • Smooth muscle myosin and actin interactions are fundamental to muscle function.

Purpose of the Study:

  • To elucidate the structural dynamics of the actomyosin complex during the muscle contraction cycle.
  • To map conformational changes in myosin upon nucleotide binding and release.

Main Methods:

  • Computer-based fitting of crystal structures into 3D reconstructions from electron cryomicroscopy.
  • Mapping structural and dynamic changes in the actomyosin complex.

Main Results:

  • Actomyosin structures in the presence and absence of MgADP differ significantly.
  • MgADP release triggers a ~34 Å movement of the light chain binding domain and a ~9° rotation of the myosin motor domain.
  • Cleft closure in the myosin head involves the upper 50 kDa region, stabilized by actin interactions.

Conclusions:

  • A model is proposed where MgATP binding opens the myosin cleft, disrupting actin interaction and releasing myosin.
  • These findings provide detailed structural insights into the myosin motor's power stroke mechanism.

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