Abstract
To investigate the mechanism of kinesin13-induced microtubule depolymerization, we have calculated a three-dimensional (3D) map of the kinesin13-microtubule ring complex, using cryo-electron microscopy (cryo-EM) and image analysis. An atomic model of the complex was produced by docking the crystal structures of tubulin and a kinesin13 motor domain (MD) into the 3D map. The model reveals a snapshot of the depolymerization mechanism by providing a 3D view of the complex formed between the kinesin13 MD and a curved tubulin protofilament (pf). It suggests that contacts mediated by kinesin13 class-specific residues in the putative microtubule-binding site stabilize intra-dimer tubulin curvature. In addition, a tubulin-binding site on the kinesin13 MD was identified. Mutations at this class-conserved site selectively disrupt the formation of microtubule-associated ring complexes.
Original language | English (US) |
---|---|
Pages (from-to) | 1732-1739 |
Number of pages | 8 |
Journal | Structure |
Volume | 16 |
Issue number | 11 |
DOIs | |
State | Published - Nov 12 2008 |
Keywords
- CELLBIO
- PROTEINS
ASJC Scopus subject areas
- Structural Biology
- Molecular Biology