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  • Title: Unliganded T3R, but not its oncogenic variant, v-erbA, suppresses RAR-dependent transactivation by titrating out RXR.
    Author: Barettino D, Bugge TH, Bartunek P, Vivanco Ruiz MD, Sonntag-Buck V, Beug H, Zenke M, Stunnenberg HG.
    Journal: EMBO J; 1993 Apr; 12(4):1343-54. PubMed ID: 8096810.
    Abstract:
    V-erbA is thought to be an antagonist of thyroid hormone receptor (T3R) function. Here we show that unliganded T3R, but not v-erbA, suppresses retinoic acid (RA)-dependent induction of the RAR-beta 2 promoter by competing for the common dimerization partner, the retinoid X receptor (RXR). Firstly, T3R suppression can be alleviated by co-transfection of RXR. Secondly, T3R, but not v-erbA, competes with RAR for RXR and causes the dissociation of a preformed RAR/RXR-RARE ternary complex in vitro. A single point mutation located in the dimerization interface of v-erbA (Pro349 to Ser) abolishes the transdominant phenotype when introduced at the respective position in T3R. The hypertransforming v-erbA variant r12, in which this mutation is reversed (Ser349 to Pro) suppresses RA-induced differentiation in chicken erythroid progenitors, while v-erbA does not. Our data thus suggest that unliganded T3R and v-erbA act as dominant suppressors through mechanistically distinct pathways.
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