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An extended dynamic model of oxidative phosphorylation.
1Institute of Molecular Biology, Jagiellonian University, Kraków, Poland.
Biochimica Et Biophysica Acta
|October 18, 1991
Summary
This study models cellular respiration, revealing how oxygen levels affect energy production. Key findings explain the control of oxidative phosphorylation and proton dynamics without complex kinetics.
Area of Science:
- Biophysics
- Cellular Respiration Modeling
Background:
- Previous models simulated cellular processes.
- Understanding oxygen's role in respiration is crucial.
Purpose of the Study:
- To simulate concentration changes and thermodynamic forces during cell suspension respiration.
- To calculate flux control coefficients for oxidative phosphorylation enzymes.
Main Methods:
- Developed a numerical model based on differential equations.
- Simulated oxygen utilization to anaerobiosis and response to oxygen pulses.
- Calculated flux control coefficients for key oxidative phosphorylation reactions.
Main Results:
- Model shows good qualitative and quantitative agreement with experimental data.
- Identified a 'hot region' near zero oxygen concentration where parameters change sharply.
- Cytochrome oxidase is consistently sensitive to oxygen concentration.
Conclusions:
- Wilson's steady-state model is compatible with shared respiratory control and non-equilibrium ATP/ADP carriers.
- Overshoot in proton motive force after reoxygenation can be explained without ATP-synthetase lag kinetics.
- Oxidative phosphorylation control is shared between system inputs and proton leak.