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Competitive and Noncompetitive Inhibition
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Competitive and Noncompetitive Inhibition

Competitive and Noncompetitive Inhibition

Author: Nathan Lampson

This lesson will introduce the two types of inhibition found in enzyme interactions: Competitive Inhibition and Noncompetitive Inhibition

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Enzymes are three dimensional proteins that combine with reactants of a chemical reaction in order to lower the amount of energy needed for the reaction to take place.  Reactants of a chemical that are acted on by an enzyme are known as the substrate.

Inhibitors are molecules that attach themselves to enzymes and disrupt the ability to speed up a chemical reaction.  Noncompetitive inhibition occurs when a molecule disrupts the shape of an enzyme by binding somewhere other than the active site.  The active site is the area of an enzyme where a substrate typically attaches.

Competitive inhibition occurs when a inhibitor molecule has a shape that is very similar to the substrate.  Enzymes are unable to distinguish the inhibitor from the normal substrate.

Competitive and Noncompetitive Inhibition