ジャーナル: Proc Natl Acad Sci U S A / 年: 2011 タイトル: Remodeling of actin filaments by ADF/cofilin proteins. 著者: Vitold E Galkin / Albina Orlova / Dmitri S Kudryashov / Alexander Solodukhin / Emil Reisler / Gunnar F Schröder / Edward H Egelman / 要旨: Cofilin/ADF proteins play key roles in the dynamics of actin, one of the most abundant and highly conserved eukaryotic proteins. We used cryoelectron microscopy to generate a 9-Å resolution three- ...Cofilin/ADF proteins play key roles in the dynamics of actin, one of the most abundant and highly conserved eukaryotic proteins. We used cryoelectron microscopy to generate a 9-Å resolution three-dimensional reconstruction of cofilin-decorated actin filaments, the highest resolution achieved for a complex of F-actin with an actin-binding protein. We show that the cofilin-induced change in the filament twist is due to a unique conformation of the actin molecule unrelated to any previously observed state. The changes between the actin protomer in naked F-actin and in the actin-cofilin filament are greater than the conformational changes between G- and F-actin. Our results show the structural plasticity of actin, suggest that other actin-binding proteins may also induce large but different conformational changes, and show that F-actin cannot be described by a single molecular model.
THE ASSEMBLY REPRESENTED IN THIS ENTRY HAS REGULAR HELICAL SYMMETRY WITH THE FOLLOWING PARAMETERS: ROTATION PER SUBUNIT (TWIST) = -162.1 DEGREES; RISE PER SUBUNIT (HEIGHT) = 27.6 ANGSTROM
THE AUTHORS STATE THAT HUMAN COFILIN-2 WAS USED IN THE EXPERIMENT, BUT HUMAN COFILIN-1 (UNP P23528) ...THE AUTHORS STATE THAT HUMAN COFILIN-2 WAS USED IN THE EXPERIMENT, BUT HUMAN COFILIN-1 (UNP P23528) WAS USED FOR MODELING.
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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: actin decorated with cofilin / タイプ: COMPLEX / 詳細: filament containing one cofilin to one actin