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• W2128907425 startingPage "6882" @default.
• W2128907425 abstract "Human transcription factor TFIID contains the TATA-binding protein (TBP) and several TBP-associated factors (TAF(II)s). To elucidate the structural organization and function of TFIID, we expressed and characterized the product of a cloned cDNA encoding human TAF(II)135 (hTAF(II)135). Comparative far Western blots have shown that hTAF(II)135 interacts strongly with hTAF(II)20, moderately with hTAF(II)150, and weakly with hTAF(II)43 and hTAF(II)250. Consistent with these observations and with sequence relationships of hTAF(II)20 and hTAF(II)135 to histones H2B and H2A, respectively, TFIID preparations that contain higher levels of hTAF(II)135 also contain higher levels of hTAF(II)20, and the interaction between hTAF(II)20 and hTAF(II)135 is critical for human TFIID assembly in vitro. From a functional standpoint, hTAF(II)135 has been found to interact strongly and directly with hTFIIA and (within a complex that also contains hTBP and hTAF(II)250) to specifically cooperate with TFIIA to relieve TAF(II)250-mediated repression of TBP binding and function on core promoters. Finally, we report a functional synergism between TAF(II)s and the TRAP/Mediator complex in activated transcription, manifested as hTAF(II)-mediated inhibition of basal transcription and a consequent TRAP requirement for both a high absolute level of activated transcription and a high and more physiological activated/basal transcription ratio. These results suggest a dynamic TFIID structure in which the switch from a basal hTAF(II)-enhanced repression state to an activator-mediated activated state on a promoter may be mediated in part through activator or coactivator interactions with hTAF(II)135." @default.
• W2128907425 created "2016-06-24" @default.
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• W2128907425 creator A5050785508 @default.
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• W2128907425 date "2001-10-01" @default.
• W2128907425 modified "2023-10-18" @default.
• W2128907425 title "Positive and Negative TAF_<b>II</b> Functions That Suggest a Dynamic TFIID Structure and Elicit Synergy with TRAPs in Activator-Induced Transcription" @default.
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• W2128907425 doi "https://doi.org/10.1128/mcb.21.20.6882-6894.2001" @default.
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