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1 Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States
2 Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands
* To whom correspondence should be addressed. E-mail: dbeard{at}mcw.edu.
Data from 31P-nuclear magnetic resonance spectroscopy of human forearm flexor muscle were analyzed based on a previously developed model of mitochondrial oxidative phosphorylation [PLoS Comp. Bio. (2005) 1:e36] to test the hypothesis that substrate level (concentrations of ADP and inorganic phosphate) represents the primary signal governing the rate of mitochondrial ATP synthesis and maintaining the cellular ATP hydrolysis potential in skeletal muscle. Model-based predictions of cytoplasmic concentrations of phosphate metabolites (ATP, ADP, and inorganic phosphate) matched data obtained from 20 healthy volunteers and indicated that as work rate is varied from rest to maximal exercise commensurate increases in the rate of mitochondrial ATP synthesis are effected by changes in concentrations of available ADP and inorganic phosphate. Additional data from patients with a defect of complex I of the respiratory chain and a patient with a deficiency in the mitochondrial adenine nucleoside translocase were also predicted the by the model by making the appropriate adjustments to the activities of the affected proteins associates with the defects, providing both further validation of the biophysical model of the control of oxidative phosphorylation and insight into the impact of these diseases on the ability of the cell to maintain its energetic state.
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