{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T20:37:37Z","timestamp":1789763857199,"version":"4.0.1"},"reference-count":70,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2025,4,4]],"date-time":"2025-04-04T00:00:00Z","timestamp":1743724800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Science and Engineering Research Board","award":["JBR-2020\u2013000003"],"award-info":[{"award-number":["JBR-2020\u2013000003"]}]},{"name":"Science and Engineering Research Board","award":["CRG\/2022\/008475"],"award-info":[{"award-number":["CRG\/2022\/008475"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomolecules"],"abstract":"<jats:p>Thyroid hormones, biosynthesized in the follicular cells in the thyroid gland, play a crucial role in regulating various important biological processes. The thyroid hormone is synthesized as pro-hormone L-thyroxine (T4), while the active form is primarily produced through the phenolic ring deiodination of T4 by iodothyronine deiodinase enzymes (DIOs). Three distinct isoforms of the enzyme are known, which, despite having almost similar amino acid sequences in their active site, differ in their regioselectivity of deiodination towards T4 and its metabolites. However, the precise mechanism and the origin of the differences in the regioselectivity of deiodination by DIOs are still not fully understood. Over the years, several research groups have attempted to mimic this system with small molecules to gain some insight into the reactivity and mechanism. In this review, we will explore the recent developments on the biomimetic deiodination of T4 and its derivatives by using selenium-based enzyme mimetics. For example, naphthalene-based molecules, featuring a 1,8-dichalcogen atom, have been shown to perform tyrosyl ring deiodination of T4 and T3, producing rT3 and 3,3\u2032-T2, respectively. The modification of the electron density around the phenolic ring through substitutions in the 4\u2032-hydroxyl group can alter the regioselectivity of the deiodination by deiodinase mimics. Additionally, we will highlight the recent progress in the development of a dipeptide-based DIO1 mimic, as well as the deiodination of other halogenated thyronine derivatives by mimics.<\/jats:p>","DOI":"10.3390\/biom15040529","type":"journal-article","created":{"date-parts":[[2025,4,4]],"date-time":"2025-04-04T14:59:57Z","timestamp":1743778797000},"page":"529","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Thyroid Hormone Deiodination\u2014Mechanisms and Small Molecule Enzyme Mimics"],"prefix":"10.3390","volume":"15","author":[{"given":"Debasish","family":"Giri","sequence":"first","affiliation":[{"name":"Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5389-5309","authenticated-orcid":false,"given":"Govindasamy","family":"Mugesh","sequence":"additional","affiliation":[{"name":"Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"7606","DOI":"10.1002\/anie.201601116","article-title":"Chemistry and biology in the biosynthesis and action of thyroid hormones","volume":"55","author":"Mondal","year":"2016","journal-title":"Angew. 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