Cooperatively between an upstream TATA-like sequence and a CAA repeated element mediates E1A-dependent negative repression of the H-2Kb class I gene
| Autor: | X, Tang, H O, Li, O, Sakatsume, T, Ohta, H, Tsutsui, A F, Smit, M, Horikoshi, P, Kourilsky, A, Israël, G, Gachelin |
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| Rok vydání: | 1995 |
| Předmět: |
Base Sequence
Transcription Genetic Molecular Sequence Data H-2 Antigens Regulatory Sequences Nucleic Acid Cell Transformation Viral Binding Competitive TATA Box DNA-Binding Proteins Repressor Proteins Mice Gene Expression Regulation Animals Adenovirus E1A Proteins RNA Messenger Promoter Regions Genetic Repetitive Sequences Nucleic Acid |
| Zdroj: | The Journal of biological chemistry. 270(5) |
| ISSN: | 0021-9258 |
| Popis: | In primary rodent cells transformed by the E1A region of the highly oncogenic adenovirus type 12, repression of transcription mediated by the far upstream TATA-like element was observed only in conjunction with either possible juxtaposition of a CAA repeated element in the presence of E1A and was dependent upon the relative arrangement of both the TATA-like and CAA repeated motifs in both homologous and heterologous promoter constructs. A gel shift competition study demonstrated that the TATA-binding protein (TBP) or a TBP-like protein can bind to both the upstream TATA-like sequence and the regular TATA box on the H-2Kb basal promoter. Moreover, employing immunoselection and cyclic amplification and selection of targets (CASTing) methods with nuclear extracts derived from Ad12-E1A transformants, we have identified a high affinity binding site in the H-2Kb class I promoter for E1A-associated DNA-binding proteins. The sequences of the binding sites were identified and were found to contain both the upstream TATA-like motif and the CAA repeated motifs. Our results suggest that the TATA-like sequence in the far upstream region of the H-2Kb gene is one of the elements that is required for Ad12-E1A-mediated negative repression. |
| Databáze: | OpenAIRE |
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