- EMDB-47441: Local refined map of the asymmetric unit of the CpaF expanded str... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-47441
タイトル
Local refined map of the asymmetric unit of the CpaF expanded structure with two ATPs and four ADPs (Under-saturated ATP/ADP dataset)
マップデータ
試料
複合体: Expanded state of CpaF with two ATPs and four ADPs
タンパク質・ペプチド: CpaF
キーワード
ATPase / MOTOR PROTEIN
機能・相同性
: / Type II/IV secretion system protein / Type II/IV secretion system protein / ATP hydrolysis activity / P-loop containing nucleoside triphosphate hydrolase / CpaF
ジャーナル: Nat Commun / 年: 2025 タイトル: Conformational changes in the motor ATPase CpaF facilitate a rotary mechanism of Tad pilus assembly. 著者: Ian Y Yen / Gregory B Whitfield / John L Rubinstein / Lori L Burrows / Yves V Brun / P Lynne Howell / 要旨: The type IV pilus family uses PilT/VirB11-like ATPases to rapidly assemble and disassemble pilin subunits. Among these, the tight adherence (Tad) pilus performs both functions using a single ...The type IV pilus family uses PilT/VirB11-like ATPases to rapidly assemble and disassemble pilin subunits. Among these, the tight adherence (Tad) pilus performs both functions using a single bifunctional ATPase, CpaF. Here, we determine three conformationally distinct structures of CpaF hexamers with varying nucleotide occupancies by cryo-electron microscopy. Analysis of these structures suggest ATP binding and hydrolysis expand and rotate the hexamer pore clockwise while subsequent ADP release contracts the ATPase. Truncation of the intrinsically disordered region of CpaF in Caulobacter crescentus equally reduces pilus extension and retraction events observed using fluorescence microscopy, but does not reduce ATPase activity. AlphaFold3 modeling suggests that CpaF and other motors of the type IV filament superfamily employ conserved secondary structural features to engage their respective platform proteins. From these data, we propose that CpaF uses a clockwise, rotary mechanism of catalysis to assemble a right-handed, helical Tad pilus, a process broadly applicable to other single motor systems.
全体 : Expanded state of CpaF with two ATPs and four ADPs
全体
名称: Expanded state of CpaF with two ATPs and four ADPs
要素
複合体: Expanded state of CpaF with two ATPs and four ADPs
タンパク質・ペプチド: CpaF
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超分子 #1: Expanded state of CpaF with two ATPs and four ADPs
超分子
名称: Expanded state of CpaF with two ATPs and four ADPs / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Three-helix bundles and N-terminal domains of the asymmetric unit
凍結剤: ETHANE / チャンバー内湿度: 95 % / チャンバー内温度: 277 K / 装置: LEICA EM GP
詳細
CHAPS detergent at a final concentration of 0.05% (w/v) was added to the buffer prior to vitrification
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電子顕微鏡法
顕微鏡
TFS KRIOS
撮影
フィルム・検出器のモデル: TFS FALCON 4i (4k x 4k) 撮影したグリッド数: 1 / 実像数: 10576 / 平均電子線量: 36.7 e/Å2 詳細: 7576 movies are untilted and 3000 movies are tilted at 30 degrees.