The enzyme activity has only been demonstrated in the direction of 5'-deiodination, which renders the thyroid hormone more active. The enzyme consists of type I and type II enzymes, both containing selenocysteine, but with different kinetics. For the type I enzyme the first reaction is a reductive deiodination converting the -Se-H group of the enzyme into an -Se-I group; the reductant then reconverts this into -Se-H, releasing iodide.
The taxonomic range for the selected organisms is: Rattus norvegicus The enzyme appears in selected viruses and cellular organisms
Synonyms
deiodinase, type 2 deiodinase, type 3 deiodinase, iodothyronine 5'-deiodinase, type 2 iodothyronine deiodinase, type 1 deiodinase, thyroxine 5'-deiodinase, type i iodothyronine deiodinase, type ii iodothyronine deiodinase, type 1 iodothyronine deiodinase, more
The enzyme activity has only been demonstrated in the direction of 5'-deiodination, which renders the thyroid hormone more active. The enzyme consists of type I and type II enzymes, both containing selenocysteine, but with different kinetics. For the type I enzyme the first reaction is a reductive deiodination converting the -Se-H group of the enzyme into an -Se-I group; the reductant then reconverts this into -Se-H, releasing iodide.
in kidney and liver cells the enzyme can serve as an enzymic barrier to the entry of the prohormone thyroxine and the source of bioactive 3,3',5-triiodothyronine for the cell
L-hormone analogues are preferentially deiodinated via the T4-5'-deiodination pathway, whereas D-analogues produce products via the T4-5-deiodination pathway
in kidney and liver cells the enzyme can serve as an enzymic barrier to the entry of the prohormone thyroxine and the source of bioactive 3,3',5-triiodothyronine for the cell
L-hormone analogues are preferentially deiodinated via the T4-5'-deiodination pathway, whereas D-analogues produce products via the T4-5-deiodination pathway
in red oxidative soleus muscle, isoform Dio2 activity increases 2.3fold after 3 days at 4°C together with the brown adipose tissue Dio2 activity, which increases 10fold. Soleus muscle and the brown adipose tissue Dio2 activities return to the control levels after 10 days of cold exposure, when an increase of 2.8fold in Dio2 activity is detected in white glycolytic gastrocnemius but not in red oxidative gastrocnemius fibers. Propranolol does not prevent muscle Dio2 induction, but it impairs the decrease of Dio2 in the brown adipose tissue and soleus after 10 days at 4°C. Serum total and free T3 is increased during cold exposure in rats
hypoxia activates type 2 deiodinase by a posttranslational mechanism, glucose depletion decrased hypoxia induced type 2 deiodinase activation, agents promoting hypoxia like desferrioxamine, dimethyloxalylglycine, diethylsuccinatecobalt chloride activate type 2 deiodinase
after 10 days of cold exposure an increase of 2.8fold in Dio2 activity is detected in white glycolytic gastrocnemius but not in red oxidative gastrocnemius fibers
in red oxidative soleus muscle, isoform Dio2 activity increases 2.3fold after 3 days at 4°C together with the brown adipose tissue Dio2 activity, which increases 10fold. Soleus muscle and the brown adipose tissue Dio2 activities return to the control levels after 10 days of cold exposure
integral membrane protein. Once assembled the D1 holoenzyme is sorted to the plasma membrane in both kidney and liver cells, where it can serve as an enzymic barrier to the entry of the prohormone thyroxine and the source of bioactive 3,3',5-triiodothyronine for the cell
in red oxidative soleus muscle, isoform Dio2 activity increases 2.3fold after 3 days at 4°C together with the brown adipose tissue Dio2 activity, which increases 10fold. Soleus muscle and the brown adipose tissue Dio2 activities return to the control levels after 10 days of cold exposure, when an increase of 2.8fold in Dio2 activity is detected in white glycolytic gastrocnemius but not in red oxidative gastrocnemius fibers. Propranolol does not prevent muscle Dio2 induction, but it impairs the decrease of Dio2 in the brown adipose tissue and soleus after 10 days at 4°C. Serum total and free T3 is increased during cold exposure in rats
both type I and type II enzyme as well as type III enzyme EC 1.97.1.11 are selenoproteins. All tissues studied maintain more than 50% deiodinase activity during prolonged selenium-deficiency. Only when selenium levels decrease by more than 80%, deiodinase activity markedly decreases
mutant enzymes, in which selenocysteine residues in the core catalytic center is replaced by cysteine, shows a 10fold increase in Km-value for 3,3',5-triiodo-L-thyronine sulfate. Deletion of the endoplasmic reticulum (ER)-signal sequence and the membrane-spanning domain, amino acids 2-35, does not result in the production of a soluble type I-like enzyme. This mutant protein is inactive but is still membrane-bound
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EXPRESSION
ORGANISM
UNIPROT
LITERATURE
bacterial lipopolysaccharide induces type 2 iodothyronine deiodinase (D2) activity with a lag-time of 4-8 h and a maximum at 24 h at 0.001 mg /ml. Glucocorticoids (0.001 mM cortisol, 10 nM dexamethasone) enhance both the basal and LPS-stimulated D2 activity and mRNA accumulation. RU486 and sulfasalazine block the effects of lipopolysaccharide on both D2 activity and mRNA accumulation. In astrocytes, co-expression of p65 nuclear factor-kappaB with the 3.8 kb form of the rat dio2 promoter leads to a 7fold increase in the transcriptional activity
increased local generation of triiodothyronine in prostate might be related to the differentiation, maturation that occurs at puberty, and, or, the energy expenditure associated with maintaining the secretory activity of the glandular epithelium
incubation (for 2-12 h at 37°C) of confluent primary cultures of astroglial cells, maintained in a chemically defined medium devoid of growth factors and hormones, with various concentrations of adenosine, AMP, ADP, ATP (highest activity at 0. 1 mM after 4 h), and a series of their analogues causes a marked induction of type 2 iodothyronine deiodinase activity (up to 30fold basal level). Preincubation of cells with all-trans-retinoic acid multiplies the inducing effect of the purines (up to 42fold increase of type 1 iodothyronine deiodinase); all-trans retinoic acid itself enhances the activity of type 2 iodothyronine deiodinase, and also of type 1 iodothyronine deiodinase, only a little
food restriction leads to reduced liver type 1 deiodinase activity, administration of 3,3,5,5-tetraiodo-L-thyronine restores type 1 deiodinase activity and promotes body protein loss
type 2 deiodinase is inactivated via WSB-1 mediated ubiquination but can be rescued from proteasomal degradation by USP-33 mediated deubiquination, expression of WSB-1 and USP-33 underlie cell specific posttranslational control of type 2 deiodinase
A study of the characteristics of the rat placental iodothyronine 5'-monodeiodinase: evidence that it is distinct from the rat hepatic iodothyronine 5'-monoiodinase