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Related Experiment Videos

Equilibrium enzymes in metabolic pathways

S P Brooks1

  • 1Nutrition Research Division, HPB, Health Canada. 3W Banting Research Centre, Ottawa, Canada.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|January 1, 1996
PubMed
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Metabolic reactions are often assumed to be near equilibrium due to high enzyme capacity. However, this study reveals that proximity to equilibrium is not universal and depends on pathway flux and enzyme kinetics.

Area of Science:

  • Biochemistry
  • Metabolic Engineering
  • Systems Biology

Background:

  • Metabolic reactions are often assumed to be near equilibrium when enzyme capacity exceeds flux.
  • This assumption simplifies metabolic control analysis but may not accurately reflect reality.

Purpose of the Study:

  • To investigate whether metabolic reactions can remain far from equilibrium despite high enzyme capacity.
  • To determine the factors influencing a reaction's proximity to equilibrium in a metabolic pathway.

Main Methods:

  • Utilized algebraic manipulations to analyze equilibrium and steady-state conditions.
  • Solved complete reaction schemes for model "equilibrium" reactions.

Main Results:

  • Demonstrated that equilibrium and steady-state conditions are mutually exclusive.

Related Experiment Videos

  • Showed that reactions can remain far from equilibrium even with high enzyme flux to pathway flux ratios.
  • Identified that proximity to equilibrium depends on overall pathway flux and kinetic parameters of other enzymes.

    • Conclusions:

    • The assumption that high enzyme capacity implies proximity to equilibrium is not universally valid.
    • A reaction's position relative to equilibrium is influenced by a complex interplay of pathway flux and enzyme kinetics.
    • Specific combinations of kinetic parameters can allow reactions to approach equilibrium, but these conditions are not general.