https://doi.org/10.1351/goldbook.A00240
@[email protected] which contain regions to which small, regulatory molecules (cf. @[email protected]) may bind in addition to and separate from @[email protected] binding sites. On binding the @[email protected], the catalytic activity of the enzyme towards the substrate may be enhanced, in which case the @[email protected] is an @[email protected], or reduced, in which case it is an @[email protected]