ジャーナル: Structure / 年: 2008 タイトル: Structure of the kinesin13-microtubule ring complex. 著者: Dongyan Tan / William J Rice / Hernando Sosa / 要旨: 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 ...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.
アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 28.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: MRC, SUPRIM, Phoelix, Other 詳細: Final map is the averaged near and far layer line data from 5 filaments (10 datasets, 3296 asymmetric units)