allosteric site

This term is a specialized technical expression used almost exclusively in biochemistry and molecular biology. It describes a regulatory mechanism where the binding of an effector molecule at one location on a protein affects the binding or catalytic properties at a different, distant location. This distinguishes it from competitive inhibition, where a molecule competes for the same active site.

In a laboratory or academic context, the term is used to explain the "switching" behavior of enzymes, where the protein transitions between an active and an inactive state. It is a precise descriptor of spatial and functional separation within a single macromolecule.