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Beef-heart mitochondrial F1-ATPase can use endogenous bound phosphate to synthesize ATP in dimethyl sulfoxide
1Department of Biochemistry, University of British Columbia, Vancouver, Canada.
FEBS Letters
|October 21, 1991
Abstract:
Beef-heart mitochondrial F1-ATPase contained 5 mol of inorganic phosphate bound per mol of F1, following pretreatment with ATP. A portion of the phosphate, bound most likely at a catalytic site, reacted in dimethylsulfoxide with endogenous adenine nucleotide to form ATP.
Insights
Beef-heart mitochondrial F1-ATPase binds inorganic phosphate at catalytic sites after ATP treatment. This bound phosphate can then react with adenine nucleotide to form more ATP, indicating a key step in energy production.
Area of Science:
- Biochemistry
- Mitochondrial function
- Enzyme kinetics
Background:
- Mitochondrial F1-adenosine triphosphatase (F1-ATPase) is crucial for cellular energy production.
- Understanding the binding and reaction mechanisms of inorganic phosphate is key to elucidating F1-ATPase function.
Purpose of the Study:
- To investigate the binding of inorganic phosphate to beef-heart mitochondrial F1-ATPase.
- To explore the reactivity of bound inorganic phosphate at catalytic sites.
Main Methods:
- Pretreatment of beef-heart mitochondrial F1-ATPase with adenosine triphosphate (ATP).
- Analysis of bound inorganic phosphate levels.
- Incubation in dimethylsulfoxide to observe phosphate reaction with endogenous adenine nucleotide.
Main Results:
- Beef-heart mitochondrial F1-ATPase was found to bind 5 mol of inorganic phosphate per mole of F1 after ATP pretreatment.
- A portion of the bound inorganic phosphate reacted with endogenous adenine nucleotide in the presence of dimethylsulfoxide.
- This reaction resulted in the formation of ATP, suggesting a catalytic role for the bound phosphate.
Conclusions:
- Mitochondrial F1-ATPase exhibits significant inorganic phosphate binding capacity at its catalytic sites.
- Bound inorganic phosphate is reactive and can participate in ATP synthesis, highlighting its role in the enzyme's catalytic cycle.