Interpreting enzyme and receptor kinetics: Keeping it simple, but not too simple

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31 Scopus citations


The hyperbolic parabola is commonly used to summarize kinetics for enzyme reactions and receptor binding kinetics. Depending on the experimental conditions, certain assumptions are valid but others might be violated so that the parameters used to fit this hyperbolic function, the maximum asymptote and the equilibrium constant, require different interpretations. The first topic of this review compares enzyme-induced transformations and receptor binding in terms of the appropriate assumptions. The second topic considers the complication of adding a competitive inhibitor as an enzyme substrate or a receptor ligand and the subtleties of inferring the equilibrium dissociation constant from the concentration of inhibitor (for example unlabeled drug) that leads to the midpoint, IC50, of an inhibition curve. Receptor binding may be measured directly by a concentration assay or as a pharmacodynamic response variable.

Original languageEnglish (US)
Pages (from-to)819-826
Number of pages8
JournalNuclear Medicine and Biology
Issue number8
StatePublished - Nov 2003


  • Cheng-Prusoff equation
  • Enzyme kinetics
  • IC
  • Kinetic modeling
  • Pharmacodynamic models
  • Receptor kinetics

ASJC Scopus subject areas

  • Molecular Medicine
  • Radiology Nuclear Medicine and imaging
  • Cancer Research

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