EMD-23117
PS3 F1-ATPase Pi-bound Dwell
EMD-23117
Single-particle3.6 Å
Deposition: 15/12/2020Map released: 21/07/2021
Last modified: 29/05/2024
Sample Organism:
Bacillus sp. (strain PS3)
Sample: PS3 F1-ATPase Pi-bound Dwell
Fitted models: 7l1s (Avg. Q-score: 0.216)
Deposition Authors: Sobti M, Ueno H
Sample: PS3 F1-ATPase Pi-bound Dwell
Fitted models: 7l1s (Avg. Q-score: 0.216)
Deposition Authors: Sobti M, Ueno H
The six steps of the complete F 1 -ATPase rotary catalytic cycle.
Abstract:
F1Fo ATP synthase interchanges phosphate transfer energy and proton motive force via a rotary catalysis mechanism. Isolated F1-ATPase catalytic cores can hydrolyze ATP, passing through six intermediate conformational states to generate rotation of their central γ-subunit. Although previous structural studies have contributed greatly to understanding rotary catalysis in the F1-ATPase, the structure of an important conformational state (the binding-dwell) has remained elusive. Here, we exploit temperature and time-resolved cryo-electron microscopy to determine the structure of the binding- and catalytic-dwell states of Bacillus PS3 F1-ATPase. Each state shows three catalytic β-subunits in different conformations, establishing the complete set of six states taken up during the catalytic cycle and providing molecular details for both the ATP binding and hydrolysis strokes. We also identify a potential phosphate-release tunnel that indicates how ADP and phosphate binding are coordinated during synthesis. Overall these findings provide a structural basis for the entire F1-ATPase catalytic cycle.
F1Fo ATP synthase interchanges phosphate transfer energy and proton motive force via a rotary catalysis mechanism. Isolated F1-ATPase catalytic cores can hydrolyze ATP, passing through six intermediate conformational states to generate rotation of their central γ-subunit. Although previous structural studies have contributed greatly to understanding rotary catalysis in the F1-ATPase, the structure of an important conformational state (the binding-dwell) has remained elusive. Here, we exploit temperature and time-resolved cryo-electron microscopy to determine the structure of the binding- and catalytic-dwell states of Bacillus PS3 F1-ATPase. Each state shows three catalytic β-subunits in different conformations, establishing the complete set of six states taken up during the catalytic cycle and providing molecular details for both the ATP binding and hydrolysis strokes. We also identify a potential phosphate-release tunnel that indicates how ADP and phosphate binding are coordinated during synthesis. Overall these findings provide a structural basis for the entire F1-ATPase catalytic cycle.