V-erba homodimers mediate the potent dominant negative activity of v-erba on everted repeats
The oncoprotein v-erbA is a mutated form of TRalpha1 that is unable to bind thyroid hormone (T3). V-erbA homodimerizes or heterodimerizes with retinoid X receptor (RXR) on core motifs arranged as direct, everted, or inverted repeats (DRs, ERs, or IRs). We created a series of v-erbA mutants in order...
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| Veröffentlicht in: | Molecular biology reports 2004-06, Vol.31 (2), p.131-137 |
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| creator | Zubkova, Inna Subauste, Jose S |
| description | The oncoprotein v-erbA is a mutated form of TRalpha1 that is unable to bind thyroid hormone (T3). V-erbA homodimerizes or heterodimerizes with retinoid X receptor (RXR) on core motifs arranged as direct, everted, or inverted repeats (DRs, ERs, or IRs). We created a series of v-erbA mutants in order to obtain a better understanding of the role of v-erbA homodimers versus v-erbA-RXR heterodimers in the dominant negative activity of v-erbA on ERs (the most potent v-erbA response elements). We found that one of these mutants, v-erbA mutant E325A, is able to homodimerize but unable to heterodimerize with RXR on ERs. Our data also suggest that v-erbA homodimers interact preferentially with the corepressor NCoR over SMRT and that the interaction with corepressors is stronger with v-erbA homodimers over v-erbA-RXR heterodimers. Furthermore, functional studies showed that v-erbA homodimers rather than v-erbA-RXR heterodimers mediate the dominant negative activity of v-erbA on ERs. |
| doi_str_mv | 10.1023/B:MOLE.0000031412.25988.30 |
| format | Article |
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V-erbA homodimerizes or heterodimerizes with retinoid X receptor (RXR) on core motifs arranged as direct, everted, or inverted repeats (DRs, ERs, or IRs). We created a series of v-erbA mutants in order to obtain a better understanding of the role of v-erbA homodimers versus v-erbA-RXR heterodimers in the dominant negative activity of v-erbA on ERs (the most potent v-erbA response elements). We found that one of these mutants, v-erbA mutant E325A, is able to homodimerize but unable to heterodimerize with RXR on ERs. Our data also suggest that v-erbA homodimers interact preferentially with the corepressor NCoR over SMRT and that the interaction with corepressors is stronger with v-erbA homodimers over v-erbA-RXR heterodimers. 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V-erbA homodimerizes or heterodimerizes with retinoid X receptor (RXR) on core motifs arranged as direct, everted, or inverted repeats (DRs, ERs, or IRs). We created a series of v-erbA mutants in order to obtain a better understanding of the role of v-erbA homodimers versus v-erbA-RXR heterodimers in the dominant negative activity of v-erbA on ERs (the most potent v-erbA response elements). We found that one of these mutants, v-erbA mutant E325A, is able to homodimerize but unable to heterodimerize with RXR on ERs. Our data also suggest that v-erbA homodimers interact preferentially with the corepressor NCoR over SMRT and that the interaction with corepressors is stronger with v-erbA homodimers over v-erbA-RXR heterodimers. 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| subjects | Amino Acid Sequence Animals Binding, Competitive Cercopithecus aethiops COS Cells Dimerization Helix-Loop-Helix Motifs - genetics Humans Molecular Sequence Data Mutagenesis, Site-Directed Oncogene Proteins v-erbA - chemistry Oncogene Proteins v-erbA - genetics Oncogene Proteins v-erbA - metabolism Point Mutation - genetics Proteins Repetitive Sequences, Nucleic Acid Repressor Proteins - chemistry Repressor Proteins - metabolism Response Elements Retinoid X Receptor alpha - chemistry Retinoid X Receptor alpha - metabolism |
| title | V-erba homodimers mediate the potent dominant negative activity of v-erba on everted repeats |
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