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Related Experiment Videos

A mechanism for microtubule depolymerization by KinI kinesins.

Carolyn A Moores1, Ming Yu, Jun Guo

  • 1Department of Cell Biology, CB227, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Molecular Cell
|May 2, 2002
PubMed
Summary

KinI kinesins, microtubule depolymerizing machines, can disassemble microtubules using only their motor core. ATP binding energy is used to bend protofilaments, unlike conventional kinesins.

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Biochemistry

Background:

  • Kinesins are motor proteins that typically move along microtubules.
  • KinI kinesins are a unique class known for their microtubule depolymerizing activity.

Purpose of the Study:

  • To investigate the depolymerizing activity of a KinI kinesin motor core fragment.
  • To elucidate the mechanism by which KinI kinesins destabilize microtubules.

Main Methods:

  • Biochemical assays to study ATP-dependent depolymerization.
  • Structural characterization of microtubule-KinI complexes.
  • Analysis of tubulin dimer deformation.

Main Results:

  • A KinI motor core fragment alone demonstrated ATP-dependent microtubule depolymerization.

Related Experiment Videos

  • The motor binds microtubules in all nucleotide states, with depolymerization occurring in the presence of AMPPNP.
  • Structural analysis revealed precise deformation of tubulin dimers during disassembly.
  • KinI kinesins utilize ATP energy to bend protofilaments, distinct from conventional kinesin powerstroke.

    • Conclusions:

    • The KinI motor core is sufficient for microtubule depolymerization.
    • KinI kinesins employ a unique mechanism of protofilament bending for disassembly.
    • Subtle differences in the KinI motor core lead to distinct depolymerizing functions.