The Enzyme Database

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EC 1.21.99.3     
Accepted name: thyroxine 5-deiodinase
Reaction: 3,3′,5′-triiodo-L-thyronine + iodide + acceptor + H+ = L-thyroxine + reduced acceptor
Other name(s): diiodothyronine 5′-deiodinase (ambiguous); iodothyronine 5-deiodinase; iodothyronine inner ring monodeiodinase; type III iodothyronine deiodinase
Systematic name: 3,3′,5′-triiodo-L-thyronine,iodide:acceptor oxidoreductase (iodinating)
Comments: The enzyme activity has only been demonstrated in the direction of 5-deiodination. This removal of the 5-iodine, i.e. from the inner ring, largely inactivates the hormone thyroxine.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 74506-30-2
References:
1.  Chopra, I.J. and Teco, G.N.C. Characteristics of inner ring (3 or 5) monodeiodination of 3,5-diiodothyronine in rat liver: evidence suggesting marked similarities of inner and outer ring deiodinases for iodothyronines. Endocrinology 110 (1982) 89–97. [PMID: 7053997]
2.  Körhle, J. Iodothyronine deiodinases. Methods Enzymol. 347 (2002) 125–167. [PMID: 11898402]
[EC 1.21.99.3 created 2003 as EC 1.97.1.11, transferred 2015 to EC 1.21.99.3]
 
 


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