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Myosin-V stepping kinetics: a molecular model for processivity.

M Rief1, R S Rock, A D Mehta

  • 1Department of Biochemistry, Stanford University Medical Center, CA 94305, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 16, 2000
PubMed
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Myosin-V, a molecular motor, moves along actin tracks. Its movement speed is limited by ADP release, revealing a tightly coupled cycle and informing a new processivity model.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biophysics

Background:

  • Myosin-V is a crucial molecular motor responsible for processive movement along actin filaments.
  • Understanding the kinetics of myosin-V's stepping is essential for elucidating its transport functions.

Purpose of the Study:

  • To investigate the stepping kinetics of myosin-V using advanced biophysical techniques.
  • To identify the rate-limiting biochemical transitions governing myosin-V's motor activity.

Main Methods:

  • Utilized a feedback-enhanced optical trap to precisely measure myosin-V's mechanical steps.
  • Analyzed the dwell time distributions between discrete 36-nm steps to characterize kinetic transitions.

Main Results:

Related Experiment Videos

  • Demonstrated that myosin-V operates as a tightly coupled motor.
  • Identified ADP release as the primary rate-limiting step in the myosin-V cycle.
  • Quantified the number and duration of biochemical transitions preceding each mechanical step.

    • Conclusions:

    • Proposed a novel model for myosin-V processivity based on the identified kinetic constraints.
    • The findings highlight the critical role of ADP release in dictating the motor's efficiency and movement characteristics.