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- W3149231636 abstract "The general transcription factor TFIID is a multiprotein complex that is essential for specific transcription initiation by RNA polymerase II. It is composed of the TATA box-binding protein (TBP) and ~13 different TBP-associated factors (TAFs). Purification of TFIID free of other general transcription factors and coactivators is essential to analyze the transcription regulatory mechanisms in reconstituted systems in vitro. A breakthrough in TFIID purification was the generation of HeLa cell lines that express a FLAG epitope-tagged TBP subunit and immunopurification protocols with monoclonal anti-FLAG antibodies. Purification of TFIID from HeLa nuclear extracts generally required a two-step purification procedure involving phosphocellulose P11 chromatography followed by anti-flag M2 affinity purification (Chiang et al., 1993; Ge et al., 1996) [1,2]. Here we show first that the MED26 (CRSP70) coactivator subunit of Mediator co-purifies with TFIID in the above two-step protocol and interacts strongly with TFIID under high salt conditions. We further show that a MED26-free TFIID complex can be obtained by including a simple additional DE52 chromatography step following P11 fractionation. Thus, we demonstrate that MED26 strongly interacts with TFIID and recommend the use of a P11-DE52-M2 resin affinity three-step purification procedure to obtain MED26-free TFIID for analyzing Mediator-dependent transcription regulatory mechanisms in purified transcription systems in vitro." @default.
- W3149231636 created "2021-04-13" @default.
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- W3149231636 date "2021-08-01" @default.
- W3149231636 modified "2023-10-17" @default.
- W3149231636 title "A simple protocol to purify human TFIID free of the MED26 subunit of mediator complex" @default.
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- W3149231636 doi "https://doi.org/10.1016/j.pep.2021.105887" @default.
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