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Related Experiment Videos

Kinetic barriers under steady-state conditions.

J Südi1

  • 1Abteilung Toxikologie, Christian-Albrechts-Universität, Kiel, Federal Republic of Germany.

The Biochemical Journal
|May 15, 1992
PubMed
Summary

Kinetic barrier diagrams reveal a new additivity rule for enzymic reactions under steady-state conditions. This rule equates initial steady-state net fluxes with the overall flux in equilibrium systems, simplifying resistance analysis.

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Area of Science:

  • Biochemistry
  • Chemical Kinetics
  • Enzyme Catalysis

Background:

  • Kinetic barrier diagrams are established tools for analyzing enzyme kinetics.
  • Understanding phenomenological resistance to net chemical fluxes under steady-state conditions is crucial for enzymology.

Purpose of the Study:

  • To demonstrate the utility of kinetic barrier diagrams for assessing enzymic turnover resistance.
  • To uncover and elucidate a novel additivity rule governing net flux profiles in enzymatic reactions.

Main Methods:

  • Analysis of a numerical example involving enzymic turnover.
  • Examination of net flux profiles under steady-state and equilibrium conditions.
  • Application of kinetic barrier diagrams to visualize phenomenological resistance.

Main Results:

  • Kinetic barrier diagrams effectively display the phenomenological resistance of enzymic turnover to net fluxes.
  • A new additivity rule for net flux profiles under limiting conditions was identified.
  • Net fluxes under initial steady-state conditions were found to be identical to the overall flux at equilibrium.

Conclusions:

  • The identified additivity rule provides a direct link between unidirectional and net fluxes.
  • The equality of 'one-way flux resistance' at equilibrium and 'net flux resistance' under steady-state is explained.
  • The findings are applicable to consecutive chemical reactions.

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