Cryo-EM reveals the structural basis of microtubule depolymerization by kinesin-13s

Nat Commun. 2018 Apr 25;9(1):1662. doi: 10.1038/s41467-018-04044-8.

Abstract

Kinesin-13s constitute a distinct group within the kinesin superfamily of motor proteins that promote microtubule depolymerization and lack motile activity. The molecular mechanism by which kinesin-13s depolymerize microtubules and are adapted to perform a seemingly very different activity from other kinesins is still unclear. To address this issue, here we report the near atomic resolution cryo-electron microscopy (cryo-EM) structures of Drosophila melanogaster kinesin-13 KLP10A protein constructs bound to curved or straight tubulin in different nucleotide states. These structures show how nucleotide induced conformational changes near the catalytic site are coupled with movement of the kinesin-13-specific loop-2 to induce tubulin curvature leading to microtubule depolymerization. The data highlight a modular structure that allows similar kinesin core motor-domains to be used for different functions, such as motility or microtubule depolymerization.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphate / metabolism
  • Cell Movement
  • Cryoelectron Microscopy
  • Drosophila Proteins / chemistry
  • Drosophila Proteins / isolation & purification
  • Drosophila Proteins / ultrastructure*
  • Kinesin / chemistry
  • Kinesin / isolation & purification
  • Kinesin / ultrastructure*
  • Microtubules / metabolism
  • Microtubules / ultrastructure*
  • Molecular Docking Simulation
  • Polymerization
  • Protein Binding
  • Protein Structure, Tertiary
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / isolation & purification
  • Recombinant Proteins / ultrastructure
  • Tubulin / chemistry
  • Tubulin / ultrastructure*

Substances

  • Drosophila Proteins
  • Recombinant Proteins
  • Tubulin
  • Adenosine Triphosphate
  • KLP10A protein, Drosophila
  • Kinesin