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Related Experiment Videos

Kinesin's moonwalk.

Nicholas J Carter1, Robert A Cross

  • 1Molecular Motors Group, Marie Curie Research Institute, The Chart, Oxted, Surrey, RH8 0TE UK.

Current Opinion in Cell Biology
|December 20, 2005
PubMed
Summary
This summary is machine-generated.

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Kinesin-1 motor proteins can "moonwalk," reversing mechanical motion while ATP turnover continues forward. This single-molecule behavior involves fast, discrete steps and brief pauses where one head remains attached to microtubules.

Area of Science:

  • Molecular motor function
  • Biophysics
  • Cellular transport

Background:

  • Kinesin-1 is a molecular motor that transports cargo along microtubules.
  • Its movement is powered by adenosine triphosphate (ATP) hydrolysis.
  • Understanding kinesin-1's mechanical and chemical coupling is crucial for cell biology.

Purpose of the Study:

  • To investigate the mechanical and chemical coupling of Kinesin-1 during directional stepping.
  • To explore the behavior of Kinesin-1 under backward mechanical load.
  • To characterize the stepping dynamics and dwell times of Kinesin-1.

Main Methods:

  • Utilized advanced optical trapping techniques to apply precise forces to single Kinesin-1 molecules.
  • Measured the displacement and force generated by Kinesin-1 during ATP turnover.

Related Experiment Videos

  • Analyzed high-resolution single-molecule data to determine step size, speed, and dwell times.

    • Main Results:

    • Kinesin-1 exhibits a
    • moonwalking
    • phenomenon: backward mechanical force reverses movement direction, while ATP hydrolysis proceeds forward.
    • Individual forward and backward steps are rapid events (tens of microseconds) and appear to be indivisible.
    • Kinesin-1 pauses between steps, with evidence suggesting only one head is firmly attached to the microtubule during these dwell periods.

    Conclusions:

    • Kinesin-1's mechanical cycle can be decoupled from its chemical cycle under specific conditions.
    • The motor protein exhibits distinct stepping behaviors, including backward motion, challenging previous models.
    • Further research is needed to elucidate the precise role and position of the second head during inter-step dwells.