Linked Life Data

12933904

Source:http://linkedlifedata.com/resource/pubmed/id/12933904

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
2003-12-9
pubmed:abstractText
The type 2 iodothyronine selenodeiodinase (D2) is an endoplasmic reticulum (ER)-resident selenoprotein that activates T4 to T3, playing a critical role in thyroid homeostasis. D2 has an approximately 45-min half-life due to selective ubiquitin-mediated ER-associated degradation (ERAD), a process of particular interest because it is accelerated by exposure to D2 substrates, T4 or rT3. The present in vitro binding studies indicate that glutathione-S-transferase (GST)-human D2 fusion proteins specifically associate with a mammalian homolog of the ubiquitin conjugase UBC7 (MmUBC7), with localization to amino acids 169-234 of D2. Coexpression of D2 with an inactive D2 mutant or a truncated version containing amino acids 169-234 stabilizes D2 half-life, supporting the importance of the carboxyl region of D2 for ERAD. Mammalian UBC6 (MmUBC6) does not directly associate with D2 but can associate with a complex containing UBC7 and D2. At the same time, functional studies in human embryonic kidney-293 cells indicate that D2 activity half-life and protein levels are stabilized only when inactive mutants of both UBC6 and UBC7 are overexpressed with D2, suggesting that redundancy may exist at the level of the E2 for both basal and substrate-accelerated D2 ERAD. In conclusion, D2 ERAD in human cells proceeds via an association between UBC7 and the carboxyl region of D2, a unique mechanism for the control of thyroid hormone activation.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0888-8809
pubmed:author
pubmed:issnType
Print
pubmed:volume
17
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2603-12
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Endoplasmic reticulum-associated degradation of the human type 2 iodothyronine deiodinase (D2) is mediated via an association between mammalian UBC7 and the carboxyl region of D2.
pubmed:affiliation
Brigham and Women's Hospital; HIM Building, Room 566, 77 Louis Pasteur Avenue, Boston, Massachusetts 02115, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.