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- Table of Contents
Facts about Thyroxine 5-deiodinase.
Responsible for the deiodination of T4 (3,5,3',5'- tetraiodothyronine) into RT3 (3,3',5'-triiodothyronine) and of T3 (3,5,3'-triiodothyronine) to T2 (3,3'-diiodothyronine).
RT3 and T2 are inactive metabolites.May play a role in preventing premature exposure of developing fetal cells to mature levels of thyroid hormones. Can modulate circulating fetal thyroid hormone concentrations throughout gestation.
Human | |
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Gene Name: | DIO3 |
Uniprot: | P55073 |
Entrez: | 1735 |
Belongs to: |
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iodothyronine deiodinase family |
5DIII; D3; deiodinase, iodothyronine, type III; DIOIII; EC 1.97.1; EC 1.97.1.11; ITDI3; placental type; thyroxine deiodinase type III (selenoprotein); Type 3 DI; type 3 iodothyronine selenodeiodinase; type III iodothyronine deiodinase; type-III 5' deiodinase; Type-III 5'-deiodinase
Mass (kDA):
33.947 kDA
Human | |
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Location: | 14q32.31 |
Sequence: | 14; NC_000014.9 (101561351..101563452) |
Expressed in placenta and several fetal tissues.
Cell membrane; Single-pass type II membrane protein. Endosome membrane; Single-pass type II membrane protein.
PMID: 7593630 by Salvatore D., et al. Type 3 iodothyronine deiodinase: cloning, in vitro expression, and functional analysis of the placental selenoenzyme.
PMID: 12746313 by Kuiper G.G., et al. Substitution of cysteine for selenocysteine in the catalytic center of type III iodothyronine deiodinase reduces catalytic efficiency and alters substrate preference.