- PDB-3j02: Lidless D386A Mm-cpn in the pre-hydrolysis ATP-bound state -
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基本情報
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データベース: PDB / ID: 3j02
タイトル
Lidless D386A Mm-cpn in the pre-hydrolysis ATP-bound state
要素
Lidless D386A Mm-cpn variant
キーワード
CHAPERONE / Mm-cpn / Chaperonin / ATP-bound
機能・相同性
機能・相同性情報
ATP-dependent protein folding chaperone / unfolded protein binding / ATP hydrolysis activity / ATP binding / metal ion binding / identical protein binding 類似検索 - 分子機能
ジャーナル: Structure / 年: 2011 タイトル: Cryo-EM structure of a group II chaperonin in the prehydrolysis ATP-bound state leading to lid closure. 著者: Junjie Zhang / Boxue Ma / Frank DiMaio / Nicholai R Douglas / Lukasz A Joachimiak / David Baker / Judith Frydman / Michael Levitt / Wah Chiu / 要旨: Chaperonins are large ATP-driven molecular machines that mediate cellular protein folding. Group II chaperonins use their "built-in lid" to close their central folding chamber. Here we report the ...Chaperonins are large ATP-driven molecular machines that mediate cellular protein folding. Group II chaperonins use their "built-in lid" to close their central folding chamber. Here we report the structure of an archaeal group II chaperonin in its prehydrolysis ATP-bound state at subnanometer resolution using single particle cryo-electron microscopy (cryo-EM). Structural comparison of Mm-cpn in ATP-free, ATP-bound, and ATP-hydrolysis states reveals that ATP binding alone causes the chaperonin to close slightly with a ∼45° counterclockwise rotation of the apical domain. The subsequent ATP hydrolysis drives each subunit to rock toward the folding chamber and to close the lid completely. These motions are attributable to the local interactions of specific active site residues with the nucleotide, the tight couplings between the apical and intermediate domains within the subunit, and the aligned interactions between two subunits across the rings. This mechanism of structural changes in response to ATP is entirely different from those found in group I chaperonins.
AUTHORS STATE THAT THE LIDLESS MM-CPN IS A MUTANT THAT THE SEQUENCE (I241-K267) HAS BEEN REPLACED ...AUTHORS STATE THAT THE LIDLESS MM-CPN IS A MUTANT THAT THE SEQUENCE (I241-K267) HAS BEEN REPLACED BY A SHORT LINKER (ETASE)