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-Structure paper
| タイトル | Structural analysis of a motor with increased mechanical output reveals new transitions in kinesin microtubule motility. |
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| ジャーナル・号・ページ | Sci Rep, Vol. 16, Issue 1, Page 487, Year 2026 |
| 掲載日 | 2026年1月5日 |
著者 | Satoki Shibata / Matthew Y Wang / Tsuyoshi Imasaki / Hideki Shigematsu / Diego Ugarte La Torre / Yuanyuan Wei / Chacko Jobichen / Hajime Hagio / J Sivaraman / Yuji Sugita / Sharyn A Endow / Ryo Nitta / ![]() |
| PubMed 要旨 | Kinesin motors use ATP to produce force in cells, yet the conformational changes that generate force remain uncertain. Here, we report structural and mechanistic insights into a minus-end-directed ...Kinesin motors use ATP to produce force in cells, yet the conformational changes that generate force remain uncertain. Here, we report structural and mechanistic insights into a minus-end-directed kinesin-14 that exhibits increased mechanical output – the variant motor binds microtubules more tightly and moves with faster velocity than wild type. High-resolution structures, together with molecular dynamics simulations, reveal previously unobserved transitions in the nucleotide hydrolysis cycle. ADP release, triggered by microtubule binding, is coupled to twisting of the central β-sheet and stabilization of the stalk prior to the power stroke. ATP binding induces stalk fluctuations and a swing of the neck mimic, an element analogous to the kinesin-1 neck linker, resembling neck linker docking in plus-end-directed kinesins. The power stroke, characterized by a large stalk rotation, is followed by motor detachment from microtubules. The subsequent recovery stroke occurs while the motor is bound to ADP and free Pi, accompanied by β-strand-to-loop transitions, or β-sheet melting, implying that β-sheet refolding facilitates Pi release. The observed twisting and melting identify the central β-sheet as the long-sought elastic element or spring required for motor force production. The transitions we observe in kinesin-14 may also apply to other kinesins – this remains to be tested. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1038/s41598-025-28573-7. |
リンク | Sci Rep / PubMed:41491787 / PubMed Central |
| 手法 | EM (らせん対称) / X線回折 |
| 解像度 | 3.15 - 4.02 Å |
| 構造データ | EMDB-39664, PDB-8yy2: EMDB-39665, PDB-8yy3: EMDB-39666, PDB-8yy4: EMDB-39667, PDB-8yy5: ![]() PDB-8yue: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-PO4: ![]() ChemComp-GTP: ![]() ChemComp-GDP: ![]() ChemComp-MG: ![]() ChemComp-ALF: |
| 由来 |
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キーワード | MOTOR PROTEIN / Kinesin-related / Microtubule motor protein / Spindle motor / CELL CYCLE / Kinesin Motor Proteins / Force Production / Power Stroke Fluctuations / Motor Spring-like Element / Reversed Motility / Mechanochemical Coupling / Mechanical States |
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