3JAT

Cryo-EM structure of GMPCPP-microtubule (14 protofilaments) decorated with kinesin

3JAT の概要

• エントリーDOI: 10.2210/pdb3jat/pdb
• 関連するPDBエントリー: 3JAK 3JAL 3JAR 3JAS
• EMDBエントリー: 6352
• 分子名称: Tubulin alpha-1B chain, Tubulin beta chain, GUANOSINE-5'-TRIPHOSPHATE, ... (5 entities in total)
• 機能のキーワード: microtubule, gmpcpp, kinesin, structural protein
• 由来する生物種: Sus scrofa (pig); 詳細
• タンパク質・核酸の鎖数: 12
• 化学式量合計: 607231.28

構造登録者

Zhang, R.,Nogales, E. (登録日: 2015-06-20, 公開日: 2015-08-12, 最終更新日: 2024-02-21)

主引用文献

Zhang, R.,Alushin, G.M.,Brown, A.,Nogales, E.
Mechanistic Origin of Microtubule Dynamic Instability and Its Modulation by EB Proteins.
Cell(Cambridge,Mass.), 162:849-859, 2015

PubMed Abstract: Microtubule (MT) dynamic instability is driven by GTP hydrolysis and regulated by microtubule-associated proteins, including the plus-end tracking end-binding protein (EB) family. We report six cryo-electron microscopy (cryo-EM) structures of MTs, at 3.5 Å or better resolution, bound to GMPCPP, GTPγS, or GDP, either decorated with kinesin motor domain after polymerization or copolymerized with EB3. Subtle changes around the E-site nucleotide during hydrolysis trigger conformational changes in α-tubulin around an "anchor point," leading to global lattice rearrangements and strain generation. Unlike the extended lattice of the GMPCPP-MT, the EB3-bound GTPγS-MT has a compacted lattice that differs in lattice twist from that of the also compacted GDP-MT. These results and the observation that EB3 promotes rapid hydrolysis of GMPCPP suggest that EB proteins modulate structural transitions at growing MT ends by recognizing and promoting an intermediate state generated during GTP hydrolysis. Our findings explain both EBs end-tracking behavior and their effect on microtubule dynamics.

PubMed: 26234155
DOI: 10.1016/j.cell.2015.07.012

実験手法

ELECTRON MICROSCOPY (3.5 Å)