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• W4247358575 abstract "The initiation of RNA polymerase II transcription is controlled by DNA sequence-specific activator proteins, in combination with cofactor polypeptides whose function is poorly understood. Transcriptional cofactors of the CTF-1 activator were purified on the basis of their affinity for the regulatory protein. These purified cofactors were found to be required for CTF-1-regulated transcription, and they counteracted squelching by an excess of activator in in vitro reconstitution experiments. Interestingly, the cofactors possessed an inhibitory activity for basal transcription, which was relieved by the further addition of the activator. Histone H1 also contributes to the regulation of transcription by CTF-1, whereby the activator prevents repression of the basal transcription machinery by the histone. However, histone H1 could not replace the cofactors for CTF-1-regulated transcription, indicating that they possess distinct transcriptional properties. Furthermore, the purified cofactors were found to be required, together with the activator, in order to antagonize the histone-mediated repression of transcription. These results suggest that CTF-1 and its cofactors function by regulating the assembly of the basal transcription machinery onto the promoter when the latter is in competition with DNA-binding inhibitory proteins such as histone H1." @default.
• W4247358575 created "2022-05-12" @default.
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• W4247358575 date "1992-11-01" @default.
• W4247358575 modified "2023-09-24" @default.
• W4247358575 title "Purified cofactors and histone H1 mediate transcriptional regulation by CTF/NF-I" @default.
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• W4247358575 doi "https://doi.org/10.1128/mcb.12.11.5228-5237.1992" @default.
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