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Thyroxine 5-deiodinase also known as type III iodothyronine deiodinase (EC number 1.21.99.3) is an enzyme that in humans is encoded by the DIO3 gene. [ 5 ] [ 6 ] This enzyme catalyses the following chemical reaction
Iodothyronine deiodinases (EC 1.21.99.4 and EC 1.21.99.3) are a subfamily of deiodinase enzymes important in the activation and deactivation of thyroid hormones. Thyroxine (T 4), the precursor of 3,5,3'-triiodothyronine (T 3) is transformed into T 3 by deiodinase activity.
Three related isoforms, deiodinase type I, II, and III, contribute to activation and inactivation of the initially released hormone precursor T 4 into T 3 (triiodothyronine) or rT 3 (reverse triiodothyronine) in target cells. The enzymes catalyze a reductive elimination of iodine (the different isoforms attack different thyronine positions ...
This receptor-corepressor-DNA complex can block gene transcription. Triiodothyronine (T 3), which is the active form of thyroxine (T 4), goes on to bind to receptors. The deiodinase catalyzed reaction removes an iodine atom from the 5′ position of the outer aromatic ring of thyroxine's (T 4) structure. [64]
Thyroxine 5-deiodinase This page was last edited on 5 September 2015, at 07:42 (UTC). Text is available under the Creative Commons Attribution-ShareAlike ...
Thyroxine deiodinase may refer to: Iodothyronine deiodinase; Thyroxine 5-deiodinase This page was last edited on 20 October 2024, at 09:40 (UTC). Text is available ...
Thyroxine, also known as T 4, is a hormone produced by the thyroid gland. It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T 3 ). [ 1 ]
For example, Iodotyrosine deiodinase is a mammalian enzyme with the unusual function of aerobic reductive dehalogenation of iodine- or bromine-substituted organic substrates. [6] Bromoxynil and ioxynil herbicides have been shown to undergo a variety of environmental transformations, including reductive dehalogenation by anaerobic bacteria.