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Nonequilibrium thermodynamics and nonlinear kinetics in a cellular signaling switch
1Department of Applied Mathematics, University of Washington, Seattle, Washington 98195, USA.
Physical Review Letters
|February 9, 2005
Summary
Biological switches rely on intracellular free energy from adenosine triphosphate (ATP) hydrolysis for signal processing. This study links ATP energy levels to the performance of cellular signaling pathways.
Area of Science:
- Biophysics
- Biochemistry
- Systems Biology
Background:
- Cellular signal processing involves complex biochemical reactions.
- Phosphorylation-dephosphorylation cycles act as biological switches in cellular signaling.
- The energetic requirements of these biological switches are not fully understood.
Purpose of the Study:
- To develop a thermodynamic framework for analyzing open biochemical reaction systems.
- To investigate the role of intracellular free energy in the performance of biological switches.
- To establish a link between signal transduction and cellular energy metabolism.
Main Methods:
- Development of a rigorous nonequilibrium thermodynamics model.
- Analysis of nonlinear biochemical reactions in an open system.
- Mathematical modeling of a phosphorylation-dephosphorylation cycle.
Main Results:
- Biological switch quality is controlled by intracellular free energy from adenosine triphosphate (ATP) hydrolysis.
- A direct correlation exists between the performance of the biological switch and the level of free energy (DeltaG).
- The energetic cost of biological information processing is quantified.
Conclusions:
- Nonequilibrium thermodynamics is crucial for understanding biological information processing.
- Cellular signal transduction is intricately linked with energy metabolism.
- Phosphoenergetics plays a significant role in ubiquitous phosphorylation signaling pathways.