IC50-to-Ki -- IC50 to Ki Converter Tool

What you can do:
Compute Ki values from experimentally determined IC50 values for inhibitors of enzymes that obey classic Michaelis-Menten kinetics and of protein-ligand interactions.
Highlights:
  • IC50-to-Ki is a web server that estimates K(i) values from experimentally determined IC(50) values for inhibitors of enzymes and of binding reactions between macromolecules (e.g. proteins, polynucleic acids) and ligands.
  • This converter was developed to enable end users to help gauge the quality of the underlying assumptions used in these calculations which depend on the type of mechanism of inhibitor action and the concentrations of the interacting molecular species.
  • Additional calculations are performed for nonclassical, tightly bound inhibitors of enzyme-substrate or of macromolecule-ligand systems in which free, rather than total concentrations of the reacting species are required.
  • Required user-defined input values include the total enzyme (or another target molecule) and substrate (or ligand) concentrations, the K(m) of the enzyme-substrate (or the K(d) of the target-ligand) reaction, and the IC(50) value.
  • Assumptions and caveats for these calculations are discussed along with examples taken from the literature.
  • The host database for this converter contains kinetic constants and other data for inhibitors of the proteolytic clostridial neurotoxins.
Keywords:
  • IC50
  • Ki
  • enzyme inhibitors
  • enzyme activity
  • ligand binding
  • Michaelis-Menton kinetics
  • protein-ligand interaction
  • converter
This record last updated: 09-25-2009

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