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Hunter and Downs plot

A graphical method for determination of dissociation constants of enzyme inhibitors. Where I is total inhibitor concentration and is the ratio of inhibited to non-inhibited rates, a plot of I/(1-) on the ordinate (y-axis) against substrate concentration on the abscissa (x-axis) will give a line that intersects the ordinate at Ki; if inhibition is competitive, the slope of the plot is Ki/Km, if non-competitive, the slope is zero. The advantage of this method lies in its not requiring that data be collected at constant substrate or inhibitor concentration. (see also Cornish-Bowden plot; Dixon plot; Easson and Stedman plot)

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