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Related Experiment Videos

Co-operativity in monomeric enzymes.

A Cornish-Bowden1, M L Cárdenas

  • 1Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Santiago.

Journal of Theoretical Biology
|January 7, 1987
PubMed
Summary
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Monomeric enzymes can exhibit kinetic cooperativity, mimicking oligomeric proteins. This phenomenon arises from parallel substrate binding pathways, not multiple binding sites, challenging previous assumptions in enzyme kinetics.

Area of Science:

  • Biochemistry
  • Enzyme Kinetics
  • Protein Dynamics

Background:

  • Monomeric enzymes were theoretically known to exhibit kinetic cooperativity resembling ligand binding in oligomeric proteins.
  • Historically, the absence of experimental evidence suggested cooperativity exclusively arose from interactions between multiple binding sites.
  • Recent findings reveal numerous examples of monomeric cooperativity, often not attributable to multi-site interactions on a single polypeptide.

Purpose of the Study:

  • To explore the mechanisms behind monomeric enzyme kinetic cooperativity.
  • To reconcile theoretical models with emerging experimental observations of non-oligomeric cooperativity.
  • To investigate the role of parallel substrate binding pathways in generating apparent cooperativity.

Main Methods:

Related Experiment Videos

  • Theoretical modeling of enzyme mechanisms.
  • Analysis of kinetic data from enzymes exhibiting cooperative behavior.
  • Comparison of experimental findings with existing models of enzyme kinetics.

Main Results:

  • Several experimental examples of monomeric kinetic cooperativity are now recognized.
  • These cases often cannot be explained by the presence of multiple binding sites on a single protein.
  • Theoretical models propose that slow parallel substrate binding pathways are key to monomeric cooperativity.

Conclusions:

  • Kinetic cooperativity is not exclusive to oligomeric proteins; monomeric enzymes can display similar behavior.
  • The mechanism involves parallel substrate binding pathways that operate out of equilibrium.
  • This challenges the long-held assumption that cooperativity necessitates multiple interacting binding sites.