00240 IUPAC Gold Book - allosteric enzymes 10.1351/goldbook.A00240 A00240 current 1 Enzymes which contain regions to which small, regulatory molecules (cf. effector) may bind in addition to and separate from substrate binding sites. On binding the effector, the catalytic activity of the enzyme towards the substrate may be enhanced, in which case the effector is an activator, or reduced, in which case it is an inhibitor. Enzymes https://goldbook.iupac.org//terms/view/E02159 activator https://goldbook.iupac.org//terms/view/A00104 effector https://goldbook.iupac.org//terms/view/E01901 inhibitor https://goldbook.iupac.org//terms/view/I03035 substrate https://goldbook.iupac.org//terms/view/S06083 PAC, 1992, 64, 143. 'Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)' on page 146 (https://doi.org/10.1351/pac199264010143) https://goldbook.iupac.org/terms/view/A00240/html https://goldbook.iupac.org/terms/view/A00240/json https://goldbook.iupac.org/terms/view/A00240/plain Citation: 'allosteric enzymes' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.A00240 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-09T10:09:12+00:00