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Related Experiment Videos

Very large response coefficients in interconvertible enzyme cascades.

A Cornish-Bowden1, S E Szedlacsek

  • 1Centre de Biochimie et de Biologie Moléculaire, Centre National de la Recherche Scientifique, Marseille, France.

Biomedica Biochimica Acta
|January 1, 1990
PubMed
Summary

This study derives response coefficients for enzyme cascades, showing they can achieve high sensitivity to effectors. These enzyme systems effectively respond to changes in activator and inhibitor concentrations.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Systems Biology

Background:

  • Enzyme cascades are crucial in cellular signaling.
  • Understanding their sensitivity to activators and inhibitors is key.
  • Monocyclic interconvertible enzyme cascades offer a model system.

Purpose of the Study:

  • Derive explicit expressions for response coefficients.
  • Assess the sensitivity of enzyme cascades to effectors.
  • Evaluate the role of activator and inhibitor concentrations.

Main Methods:

  • Mathematical derivation of response coefficients.
  • Analysis of enzyme cascade kinetics.
  • Numerical simulations of system behavior.

Main Results:

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  • Explicit formulas for response coefficients were obtained.
  • The cascade's sensitivity to effector concentration was quantified.
  • Response coefficients around 7 were achieved under non-optimal conditions.

Conclusions:

  • Monocyclic interconvertible enzyme cascades can generate highly sensitive responses.
  • Simultaneous modulation of all reactions is not necessary for high sensitivity.
  • System parameters do not need to be at their optimum values for effective response.