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Conditions for effective allosteric feedforward and feedback in metabolic pathways
J H S Hofmeyr1, J M Rohwer, J L Snoep
1Triple-J Group for Molecular Cell Physiology, Department of Biochemistry, University of Stellenbosch, Stellenbosch 7600, South Africa jhsh@sun.ac.za
Systems Biology
|September 22, 2006
Summary
Allosteric modifiers
Area of Science:
- Biochemistry and metabolic pathway regulation.
Background:
- Allosteric modifiers play a crucial role in regulating metabolic pathways.
- The effectiveness of these modifiers depends on enzyme properties and pathway control.
Purpose of the Study:
- To analyze how different allosteric modification mechanisms affect metabolic pathway steady-state properties.
- To compare the efficacy of specific (binding) versus catalytic effects in feedback and feedforward regulation.
Main Methods:
- Analysis of mixed inhibition, allosteric inhibition, and activation.
- Modeling using reversible Monod-Wyman-Changeux and reversible Hill models.
Main Results:
- Modifier effects on substrate and product binding are more effective as negative feedback.
- These binding effects are less effective as positive feedforward mechanisms.
Conclusions:
- Catalytic effects altering apparent limiting velocity are predicted to be more effective for feedforward activation.
- Understanding enzyme control properties is essential for predicting allosteric modifier efficacy.
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