National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R00GM112982
米国
Other private
DFS-20-16 (Damon Runyon Cancer Research Foundation)
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM097312
米国
Howard Hughes Medical Institute (HHMI)
米国
引用
ジャーナル: EMBO J / 年: 2019 タイトル: Coupling of ATPase activity, microtubule binding, and mechanics in the dynein motor domain. 著者: Stefan Niekamp / Nicolas Coudray / Nan Zhang / Ronald D Vale / Gira Bhabha / 要旨: The movement of a molecular motor protein along a cytoskeletal track requires communication between enzymatic, polymer-binding, and mechanical elements. Such communication is particularly complex and ...The movement of a molecular motor protein along a cytoskeletal track requires communication between enzymatic, polymer-binding, and mechanical elements. Such communication is particularly complex and not well understood in the dynein motor, an ATPase that is comprised of a ring of six AAA domains, a large mechanical element (linker) spanning over the ring, and a microtubule-binding domain (MTBD) that is separated from the AAA ring by a ~ 135 Å coiled-coil stalk. We identified mutations in the stalk that disrupt directional motion, have microtubule-independent hyperactive ATPase activity, and nucleotide-independent low affinity for microtubules. Cryo-electron microscopy structures of a mutant that uncouples ATPase activity from directional movement reveal that nucleotide-dependent conformational changes occur normally in one-half of the AAA ring, but are disrupted in the other half. The large-scale linker conformational change observed in the wild-type protein is also inhibited, revealing that this conformational change is not required for ATP hydrolysis. These results demonstrate an essential role of the stalk in regulating motor activity and coupling conformational changes across the two halves of the AAA ring.
全体 : delta T3046-T3055 mutant of yeast cytoplasmic dynein
全体
名称: delta T3046-T3055 mutant of yeast cytoplasmic dynein
要素
複合体: delta T3046-T3055 mutant of yeast cytoplasmic dynein
-
超分子 #1: delta T3046-T3055 mutant of yeast cytoplasmic dynein
超分子
名称: delta T3046-T3055 mutant of yeast cytoplasmic dynein タイプ: complex / ID: 1 / 親要素: 0 詳細: Cryo-EM reconstruction of delta T3046-T3055 mutant of yeast cytoplasmic dynein in the presence of AMPPNP - Class 1
由来(天然)
生物種: Saccharomyces cerevisiae (パン酵母)
組換発現
生物種: Saccharomyces cerevisiae (パン酵母)
-
実験情報
-
構造解析
手法
クライオ電子顕微鏡法
解析
単粒子再構成法
試料の集合状態
particle
-
試料調製
緩衝液
pH: 8
凍結
凍結剤: ETHANE
-
電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 58.0 e/Å2