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Structural transitions in kinesin minus-end directed microtubule motility.

Authors :
Shibata S
Wang MY
Imasaki T
Shigematsu H
Wei Y
Jobichen C
Hagio H
Sivaraman J
Endow SA
Nitta R
Source :
BioRxiv : the preprint server for biology [bioRxiv] 2024 Jul 29. Date of Electronic Publication: 2024 Jul 29.
Publication Year :
2024

Abstract

Kinesin motor proteins hydrolyze ATP to produce force for spindle assembly and vesicle transport, performing essential functions in cell division and motility, but the structural changes required for force generation are uncertain. We now report high-resolution structures showing new transitions in the kinesin mechanochemical cycle, including power stroke fluctuations upon ATP binding and a post-hydrolysis state with bound ADP + free phosphate. We find that rate-limiting ADP release occurs upon microtubule binding, accompanied by central β-sheet twisting, which triggers the power stroke - stalk rotation and neck mimic docking - upon ATP binding. Microtubule release occurs with β-strand-to-loop transitions, implying that β-strand refolding induces Pi release and the recovery stroke. The strained β-sheet during the power stroke and strand-to-loop transitions identify the β-sheet as the long-sought motor spring.<br />Competing Interests: Competing interests: The authors declare that they have no competing interests.

Details

Language :
English
ISSN :
2692-8205
Database :
MEDLINE
Journal :
BioRxiv : the preprint server for biology
Publication Type :
Academic Journal
Accession number :
39131399
Full Text :
https://doi.org/10.1101/2024.07.29.605428