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Updated: Apr 28, 2026
07:38
Measuring In Vitro ATPase Activity for Enzymatic Characterization
Published on: August 23, 2016
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Rotary ATPases--dynamic molecular machines.
Alastair G Stewart1, Elise M Laming1, Meghna Sobti1
1The Victor Chang Cardiac Research Institute, Sydney, NSW, Australia; The University of New South Wales, Sydney, NSW, Australia.
Current Opinion in Structural Biology
|June 1, 2014
Summary
Rotary ATPases like F-type, V-type, and A-type show complex architectures and dynamics. Their flexible subunit movements suggest sophisticated regulation for cellular efficiency.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Machines
Background:
- Rotary ATPases (F-type, V-type, A-type) are crucial molecular machines.
- Understanding their architecture and function is key to cellular energy processes.
Purpose of the Study:
- To detail the architecture and subunit composition of rotary ATPases.
- To investigate the supra-molecular arrangement and dynamics of these enzymes.
Main Methods:
- Fitting high-resolution X-ray structures into electron microscopy envelopes.
- Utilizing electron cryo-tomography for intact enzyme analysis.
- Employing various techniques to observe inherent flexibility.
Main Results:
- Detailed composite models of F, V, and A-type ATPases were constructed.
- New insights into eukaryotic ATP synthase arrangement in mitochondria were gained.
- Inherent flexibility suggests greater operational dynamics than previously thought.
Conclusions:
- Concerted subunit movement may regulate rotary ATPases.
- This movement could facilitate information transfer within the enzyme complex.
- Flexibility allows fine-tuning for cellular environment and optimizes efficiency.
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