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.
DBREF IS NOT PROVIDED BECAUSE THE STRUCTURES USED TO GENERATE THE MODELS WERE DERIVED FROM ...DBREF IS NOT PROVIDED BECAUSE THE STRUCTURES USED TO GENERATE THE MODELS WERE DERIVED FROM DIFFERENT SOURCE THAN THE SOURCE OF THE PROTEIN
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: FILAMENT / 3次元再構成法: らせん対称体再構成法
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試料調製
構成要素
名称: Kinesin13-Microtubule ring complex / タイプ: COMPLEX
緩衝液
pH: 6.8 詳細: 80 mM Pipes, pH 6.8, 2 mM MgCl2, 1 mM EGTA, 2 mM AMP-PNP, 0.02 mM taxol