{"term":{"id":"13329","title":"indolamine-2,3-dioxygenase","longtitle":"IUPAC Gold Book - indolamine-2,3-dioxygenase","doi":"10.1351\/goldbook.13329","code":"13329","status":"current","initialism":"<em>initialism<\/em>: IDO","definitions":[{"id":1,"text":"Enzyme catalyzing the initial rate-limiting step of tryptophan degradation.","notes":{"1":"Tryptophan is required for T-cell proliferation. Local degradation of tryptophan thus modulates T-cell activity."},"links":[{"term":"T-cell","url":"https:\/\/goldbook.iupac.org\/terms\/view\/13724"},{"term":"tryptophan","url":"https:\/\/goldbook.iupac.org\/terms\/view\/13756"}],"sources":["PAC, 2012, 84, 1113. 'IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)' on page 1193 (https:\/\/doi.org\/10.1351\/PAC-REC-11-06-03)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/13329\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/13329\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/13329\/plain"},"citation":"Citation: 'indolamine-2,3-dioxygenase' 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.13329","license":"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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","disclaimer":"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.","accessed":"2026-07-25T06:41:45+00:00"}}