{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,2]],"date-time":"2023-10-02T16:02:50Z","timestamp":1696262570738},"reference-count":72,"publisher":"Oxford University Press (OUP)","issue":"6","license":[{"start":{"date-parts":[[2022,3,4]],"date-time":"2022-03-04T00:00:00Z","timestamp":1646352000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,5,27]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Tryptophan 2,3-dioxygenase (TDO) and indoleamine 2,3-dioxygenase (IDO) catalyse the same reaction, oxidative cleavage of L-tryptophan (L-Trp) to N-formyl-kynurenine. In both enzymes, the ferric form is inactive and ascorbate (Asc) is frequently used as a reductant in in vitro assays to activate the enzymes by reducing the heme iron. Recently, it has been reported that Asc activates IDO2 by acting as a reductant; however, it is also a competitive inhibitor of the enzyme. Here, the effect of Asc on human TDO (hTDO) is investigated. Similar to its interaction with IDO2, Asc acts as both a reductant and a competitive inhibitor of hTDO in the absence of catalase, and its inhibitory effect was enhanced by the addition of H2O2. Interestingly, however, no inhibitory effect of Asc was observed in the presence of catalase. TDO is known to be activated by H2O2 and a ferryl-oxo (FeIV=O) intermediate (Compound II) is generated during the activation process. The observation that Asc acts as a competitive inhibitor of hTDO only in the absence of catalase can be explained by assuming that the target of Asc is Compound II. Asc seems to compete with L-Trp in an unusual manner.<\/jats:p>","DOI":"10.1093\/jb\/mvac024","type":"journal-article","created":{"date-parts":[[2022,3,3]],"date-time":"2022-03-03T12:13:25Z","timestamp":1646309605000},"page":"653-661","source":"Crossref","is-referenced-by-count":5,"title":["Inhibitory effect of ascorbate on tryptophan 2,3-dioxygenase"],"prefix":"10.1093","volume":"171","author":[{"given":"Hajime Julie","family":"Yuasa","sequence":"first","affiliation":[{"name":"National University Corporation Kochi University Laboratory of Biochemistry, Department of Chemistry and Biotechnology, Faculty of Science and Technology, , Kochi 780-8520, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2022,3,4]]},"reference":[{"key":"2022061514302855100_ref1","doi-asserted-by":"crossref","first-page":"18","DOI":"10.1016\/j.abb.2013.11.009","article-title":"Heme-dependent dioxygenases in tryptophan oxidation","volume":"544","author":"Geng","year":"2014","journal-title":"Arch. 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