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Noncompetitive Inhibition definitions

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  • Noncompetitive Inhibition
    A reversible enzyme regulation where binding occurs at allosteric sites, equally affecting both free enzyme and enzyme-substrate complex.
  • Allosteric Site
    A location on an enzyme distinct from the active site, where inhibitors can bind and alter enzyme activity.
  • Mixed Inhibition
    A form of enzyme inhibition involving binding to both free enzyme and enzyme-substrate complex, but with variable affinities.
  • Enzyme-Substrate Complex
    A temporary molecular assembly formed when an enzyme binds its substrate prior to catalysis.
  • Vmax
    The maximum velocity of an enzyme-catalyzed reaction, reduced in the presence of noncompetitive inhibitors.
  • Km
    A measure of substrate concentration required for half-maximal enzyme activity, remaining unchanged with noncompetitive inhibition.
  • Alpha
    A factor representing the degree of inhibition on the free enzyme, equal to alpha prime in noncompetitive inhibition.
  • Alpha Prime
    A factor indicating the degree of inhibition on the enzyme-substrate complex, matching alpha in noncompetitive inhibition.
  • Michaelis-Menten Plot
    A graphical representation of enzyme kinetics showing decreased Vmax but unchanged Km with noncompetitive inhibition.
  • Lineweaver-Burk Plot
    A double reciprocal graph of enzyme kinetics where slope and y-intercept increase, but x-intercept remains constant under noncompetitive inhibition.
  • Inhibition Constant
    A value quantifying inhibitor binding affinity, identical for both free enzyme and enzyme-substrate complex in noncompetitive inhibition.
  • Catalytic Constant
    A parameter reflecting enzyme turnover rate, decreased when noncompetitive inhibitors are present.
  • Turnover Number
    The number of substrate molecules converted per enzyme per unit time, lowered by noncompetitive inhibition.
  • Y-Intercept
    The reciprocal of Vmax in Lineweaver-Burk plots, increased when noncompetitive inhibitors are present.
  • X-Intercept
    The negative reciprocal of Km in Lineweaver-Burk plots, remaining unchanged with noncompetitive inhibition.