Editing Active site (section)

==Allosteric sites==
{{Main|Allosteric regulation}}

[[File:Allosteric Regulation.svg|thumb|A – Active site
B – Allosteric site
C – Substrate
D – Inhibitor
E – Enzyme.
This is a diagram of allosteric regulation of an enzyme. When inhibitor binds to the allosteric site the shape of active site is altered, so substrate cannot fit into it|300px]]
An [[regulatory site|allosteric site]] is a site on an enzyme, unrelated to its active site, which can bind an effector molecule. This interaction is another mechanism of enzyme regulation. Allosteric modification usually happens in proteins with more than one subunit. Allosteric interactions are often present in metabolic pathways and are beneficial in that they allow one step of a reaction to regulate another step.<ref name=DeDecker2000 /> They allow an enzyme to have a range of molecular interactions, other than the highly specific active site.<ref name=DeDecker2000 />