Allosteric enzyme

allosteric enzyme An enzyme that contains a region,separate from the region that binds the SUB-STRATE for catalysis. Where a small regulatory molecule binds and affects that catalytic activity. This effector molecule may be structurally unrelated to the substrate, or it may be a second molecule of substrate. if the cat­alytic activity is enhanced by binding, the effector is called an activator; if it is diminished, the effector is called an inhibitor.