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Kinesin ATPase: rate-limiting ADP release.

D D Hackney1

  • 1Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, PA 15213.

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1988
PubMed
Summary

Kinesin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Kinesin is a motor protein that transports cargo within cells.
  • Kinesin's ATPase activity is crucial for its function.
  • Understanding kinesin's mechanism is key to cellular transport research.

Purpose of the Study:

  • To investigate the ATPase kinetics of bovine brain kinesin.
  • To determine the role of tubulin in modulating kinesin's ATPase activity.
  • To elucidate the rate-limiting steps in the kinesin ATPase cycle.

Main Methods:

  • Kinesin isolation from bovine brain.
  • Measurement of ATPase rates under varying conditions.
  • Analysis of ADP and Pi release kinetics using biochemical assays.
  • Enzyme kinetics and binding studies.

Main Results:

  • Tubulin interaction stimulates kinesin's ATPase rate 1000-fold.
  • Pi release is rapid and not rate-limiting.
  • ADP release is the rate-limiting step in basal kinesin activity.
  • Tubulin accelerates ADP release, but biphasic kinetics suggest partial unaffected sites.

Conclusions:

  • Tubulin binding significantly enhances kinesin's ATPase turnover.
  • Kinesin's ATPase cycle is primarily regulated by ADP release kinetics.
  • Tubulin acts as an activator by facilitating ADP dissociation.
  • Kinesin may exhibit functional heterogeneity in its interaction with tubulin.

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