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Highly sensitive detection of ATPase activity in native gels
Tina Suhai1, Nicolas G Heidrich, Norbert A Dencher
1Physical Biochemistry, Department of Chemistry, Technische Universität Darmstadt, Darmstadt, Germany.
Electrophoresis
|September 29, 2009
Summary
This study enhances native gel electrophoresis for detecting low ATP hydrolysis activity. A new method using taurodeoxycholate and ammonium sulfide improves visualization of ATP synthase enzyme activity.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Native electrophoresis is crucial for analyzing intact protein complexes and their enzymatic activities.
- Current methods for detecting ATP hydrolysis activity using lead phosphate precipitates on native gels have limitations in sensitivity and visualization, especially for low activities.
- Analysis of photosynthetic ATP synthases requires methods that overcome inhibition of latent ATPase functions.
Purpose of the Study:
- To develop a more sensitive and robust method for detecting low ATP hydrolysis activity using native gel electrophoresis.
- To adapt existing protocols for improved visualization and quantification of enzyme activity, particularly for photosynthetic ATP synthases.
- To enhance the detection limits of ATPase activity assays performed on native gels.
Main Methods:
- Incubation of native gels in a detergent solution, with taurodeoxycholate identified as the most effective activator.
- Modification of the lead phosphate precipitate formation step.
- An additional incubation step with ammonium sulfide to convert lead phosphate into lead sulfide for enhanced band detection.
Main Results:
- The optimized protocol successfully enhances the detection of low ATPase activities.
- The conversion of white lead phosphate bands to brownish-black lead sulfide bands significantly improves visualization and documentation.
- The new procedure maintains the linear quantitation range of the original method while expanding the detection limit.
Conclusions:
- The developed method offers a significant improvement for detecting and quantifying low ATP hydrolysis activities in protein complexes via native gel electrophoresis.
- This enhanced protocol is particularly valuable for studying enzymes like photosynthetic ATP synthases, which may exhibit latent activities.
- The improved visualization and expanded detection limit make this a powerful tool for biochemical and molecular biology research.
