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Related Experiment Videos

Bistability and the ordered bimolecular mechanism.

K W Raymond1, Y Pocker

  • 1Department of Chemistry and Biochemistry, Eastern Washington University, Cheney 99004.

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|September 1, 1991
PubMed
Summary

A new equation models enzymatic reactions with substrate and product inhibition. This model reveals how substrate inhibition can lead to multiple steady states in open systems, applicable to various biochemical processes.

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Area of Science:

  • Biochemistry
  • Enzyme Kinetics
  • Chemical Reaction Engineering

Background:

  • Enzymatic reactions are crucial in biological systems.
  • Understanding reaction dynamics, including inhibition, is key to predicting cellular behavior.
  • Substrate and product inhibition can complicate enzyme kinetics.

Purpose of the Study:

  • To derive an equation for the instantaneous velocity of ordered bimolecular enzymatic reactions with substrate and product inhibition.
  • To investigate the relationship between substrate inhibition and multiple steady states in an open-reaction system.
  • To demonstrate a general computational approach for analyzing enzymatic reaction dynamics.

Main Methods:

  • Derivation of a novel velocity equation for enzymatic reactions.

Related Experiment Videos

  • Application of the derived equation to horse liver alcohol dehydrogenase kinetics.
  • Analysis of an open-reaction system using calculated steady-state surfaces.

    • Main Results:

    • The derived velocity expression accurately describes enzymatic reactions with substrate and product inhibition.
    • Calculated steady-state surfaces for horse liver alcohol dehydrogenase showed regions of bistability.
    • The results confirm a link between substrate inhibition and the occurrence of multiple steady states.

    Conclusions:

    • The derived equation provides a valuable tool for studying complex enzymatic reactions.
    • Substrate inhibition is a significant factor contributing to multiple steady states in open enzymatic systems.
    • The computational approach is broadly applicable to various biochemical systems described by velocity equations.