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- W2911575607 abstract "V1-ATPase is an ATP-driven rotary motor that is composed of a ring-shaped A3B3 complex and a central DF shaft. The nucleotide-free A3B3 complex of Enterococcus hirae, composed of three identical A1B1 heterodimers, showed a unique asymmetrical structure, probably due to the strong binding of the N-terminal barrel domain, which forms a crown structure. Here, we mutated the barrel region to weaken the crown, and performed structural analyses using high-speed atomic force microscopy and x-ray crystallography of the mutant A3B3. The nucleotide-free mutant A3B3 complex had a more symmetrical open structure than the wild type. Binding of nucleotides produced a closely packed spiral-like structure with a disrupted crown. These findings suggest that wild-type A3B3 forms a metastable (stressed) asymmetric structure composed of unstable A1B1 conformers due to the strong constraint of the crown. The results further the understanding of the principle of the cooperative transition mechanism of rotary motors." @default.
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- W2911575607 date "2019-01-04" @default.
- W2911575607 modified "2023-10-16" @default.
- W2911575607 title "Metastable asymmetrical structure of a shaftless V <sub>1</sub> motor" @default.
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- W2911575607 doi "https://doi.org/10.1126/sciadv.aau8149" @default.
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