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-Structure paper
| タイトル | Conformational changes in the motor ATPase CpaF facilitate a rotary mechanism of Tad pilus assembly. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 3839, Year 2025 |
| 掲載日 | 2025年4月24日 |
著者 | Ian Y Yen / Gregory B Whitfield / John L Rubinstein / Lori L Burrows / Yves V Brun / P Lynne Howell / ![]() |
| PubMed 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. |
リンク | Nat Commun / PubMed:40268890 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.8 - 4.1 Å |
| 構造データ | ![]() EMDB-47431: Consensus map of the CpaF closed structure without nucleotides (Apo dataset) ![]() EMDB-47432: Local refined map of the asymmetric unit of the CpaF closed structure without nucleotides (Apo dataset) EMDB-47433, PDB-9e24: ![]() EMDB-47434: Consensus map of the CpaF compact structure without nucleotides (Apo dataset) ![]() EMDB-47435: Local refined map of the asymmetric unit of the CpaF compact structure without nucleotides (Apo dataset) EMDB-47436, PDB-9e25: ![]() EMDB-47437: Consensus map of the CpaF compact structure with two ATPs and two ADPs (Under-saturated ATP/ADP dataset) ![]() EMDB-47438: Local refinement of the asymmetric unit of the CpaF compact structure with two ATPs and two ADPs (Under-saturated ATP/ADP dataset) EMDB-47439, PDB-9e26: ![]() EMDB-47440: Consensus map of the CpaF expanded structure with two ATPs and four ADPs (Under-saturated ATP/ADP dataset) ![]() EMDB-47441: Local refined map of the asymmetric unit of the CpaF expanded structure with two ATPs and four ADPs (Under-saturated ATP/ADP dataset) EMDB-47442, PDB-9e27: ![]() EMDB-47444: Consensus map of the CpaF expanded structure with two ATPs and four ADPs (Saturated ATP dataset) ![]() EMDB-47445: Local refined map of the asymmetric unit of the CpaF expanded structure with two ATPs and four ADPs (Saturated ATP dataset) EMDB-47446, PDB-9e29: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ATP: ![]() ChemComp-ADP: |
| 由来 |
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キーワード | MOTOR PROTEIN / ATPase |
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caulobacter vibrioides (バクテリア)
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