Thyroid Hormone Deiodination-Mechanisms and Small Molecule Enzyme Mimics.
Level 5 - mechanism / opinion, no new human data
Narrative review of chemical mechanisms and in vitro biomimetic small-molecule models without human data.
PubMed 40305277 · doi:10.3390/biom15040529
What was done
This narrative review synthesizes research on the mechanisms of iodothyronine deiodinase enzymes (DIOs) and evaluates recent developments in selenium-based small-molecule enzyme mimetics engineered to catalyze the deiodination of L-thyroxine (T4) and its derivatives.
What was found
The abstract reports no numerical data. Qualitatively, it highlights that 1,8-dichalcogen-substituted naphthalene-based molecules perform tyrosyl ring deiodination of T4 and T3 to produce rT3 and 3,3'-T2, respectively. Modifying phenolic ring electron density via 4'-hydroxyl group substitutions alters deiodination regioselectivity. Progress on dipeptide-based DIO1 mimics and deiodination of other halogenated thyronine derivatives is also discussed.
Why it matters
Biomimetic small-molecule mimics clarify how structural and electronic features govern the regioselectivity of thyroid hormone deiodination, providing insights into DIO catalytic mechanisms that could inform future artificial enzyme design.
Limits
The abstract provides no quantitative kinetic parameters, yields, or comparative metrics. The work reflects in vitro chemical modeling rather than human physiological or clinical studies, precluding any conclusions regarding biological safety, efficacy, or therapeutic application.
Cited by
- supports T4 is an inactive thyroid hormone, whereas T3 is the active thyroid hormone.