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ATP-driven rotation of the gamma subunit in F(1)-ATPase
J Weber1, S Nadanaciva, A E Senior
1Department of Biochemistry and Biophysics, Box 712, University of Rochester Medical Center, 14642, Rochester, NY, USA.
FEBS Letters
|October 18, 2000
Summary
The F(1)-ATPase enzyme uses MgATP hydrolysis to drive gamma subunit rotation through conformational changes in the alpha subunit. Specific arginine residues transmit force during ATP hydrolysis, causing rotation.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- F(1)-ATPase is a key molecular motor responsible for ATP synthesis.
- Understanding the precise mechanism of F(1)-ATPase rotation is crucial for comprehending cellular energy production.
Purpose of the Study:
- To elucidate the detailed mechanism by which MgATP hydrolysis in F(1)-ATPase drives the rotation of the gamma subunit.
- To identify the key residues and conformational changes involved in force transmission during ATP hydrolysis.
Main Methods:
- Analysis of the F(1)-ATPase catalytic cycle.
- Investigating conformational changes in the alpha subunit.
- Role of specific arginine residues (alphaArg376 and betaArg182) in force transmission.
Main Results:
- MgATP hydrolysis at the alpha/beta interface induces conformational changes in the alpha subunit.
- Transition state formation and product release transmit force via alphaArg376 and betaArg182.
- These conformational changes in alpha directly lead to the rotation of the gamma subunit.
Conclusions:
- A novel mechanism for F(1)-ATPase rotation is proposed, driven by MgATP hydrolysis and mediated by alpha subunit conformational changes.
- The study highlights the critical role of specific arginine residues in transmitting mechanical force during the enzyme's catalytic cycle.