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Time-dependent control of metabolic systems by external effectors
S E Szedlacsek1, A R Aricescu, B H Havsteen
1Institute of Biochemistry, Department of Enzymology, Bucharest, Romania.
Journal of Theoretical Biology
|October 7, 1996
Summary
This study derives elasticity and control coefficients for time-dependent enzyme regulation, revealing how external effectors influence metabolic systems. Non-steady state analysis offers a more realistic view of these dynamic biological processes.
Area of Science:
- Biochemistry
- Systems Biology
- Enzyme Kinetics
Background:
- Enzyme kinetics traditionally assumes steady-state conditions.
- External effectors can dynamically alter enzyme activity over time.
- Understanding metabolic control requires analyzing non-steady-state conditions.
Purpose of the Study:
- To derive elasticity and control coefficients for time-dependent enzyme inhibition/activation.
- To analyze a metabolic system influenced by a time-dependent effector.
- To investigate the physiological importance of non-steady-state metabolic analysis.
Main Methods:
- Derivation of elasticity coefficients under restrictive assumptions (Michaelis-Menten kinetics, competitive effectors).
- Analysis of a simple metabolic system with a time-dependent effector.
- Numerical examples to illustrate control coefficients as functions of time and effector concentration.
Main Results:
- Elasticity and control coefficients were successfully derived for time-dependent enzyme regulation.
- Control coefficients generally vary within a limited range.
- Local minima or significant modifications in control coefficients were observed at specific time and effector concentration intervals.
Conclusions:
- Non-steady-state analysis provides a more realistic representation of metabolic control processes.
- Time-dependent effectors can lead to dynamic variations in metabolic control.
- The derived coefficients are crucial for understanding complex enzyme-effector interactions in biological systems.