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Related Experiment Videos

Kinesin has three nucleotide-dependent conformations. Implications for strain-dependent release.

J Xing1, W Wriggers, G M Jefferson

  • 1Departments of Biochemistry and Molecular Genetics and Neurology and the Graduate Program in Cell and Molecular Biology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.

The Journal of Biological Chemistry
|June 15, 2000
PubMed
Summary

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This study reveals how kinesin motor proteins change shape during their cycle. Understanding these structural shifts in kinesin is key to deciphering its movement mechanism.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Limited crystallographic data exists for nucleotide-bound states of kinesin, hindering understanding of its ATPase cycle.
  • Previous studies focused on myosin, leaving kinesin's structural dynamics less understood at a molecular level.

Purpose of the Study:

  • To investigate the molecular-level structural changes in human kinesin motor domain during its ATPase cycle.
  • To characterize the communication between catalytic and microtubule-binding sites in kinesin.

Main Methods:

  • Production of single tryptophan mutants in monomeric human kinesin motor domain.
  • Utilizing fluorescence resonance energy transfer (FRET) to measure intramolecular distances in different binding states.
  • Performing kinetic studies of fluorescent nucleotide binding.

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Main Results:

  • Mutants exhibited nucleotide-dependent microtubule affinity changes similar to wild-type kinesin.
  • FRET measurements provided direct evidence for the essential role of the switch II loop and helix movement in mediating communication.
  • Molecular modeling supported the observed structural communication pathways.
  • Kinetic studies indicated that ADP binding induces two distinct structural transitions, differing from ATP binding.

Conclusions:

  • Movement of the switch II loop and helix is crucial for kinesin's mechanochemical cycle.
  • ADP binding induces unique structural changes, distinct from ATP binding, impacting kinesin's function.
  • This research provides a foundation for understanding kinesin's structural dynamics and mechanochemical cycle.