Noncompetitive and Allosteric Inhibition
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A noncompetitive inhibitor binds an enzyme away from its active site, at an allosteric site, changing its shape so the active site binds substrate less well.
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Excess ATP binds an early glycolytic enzyme away from its active site, distorting its shape and slowing the pathway down.
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Because it binds elsewhere, a noncompetitive inhibitor's effect does not weaken as substrate concentration rises.