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Human Mediator Subunit MED26 Functions as a Docking Site for Transcription Elongation Factors
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Summary Promoter proximal pausing by initiated RNA polymerase II (Pol II) and regulated release of paused polymerase into productive elongation has emerged as a major mechanism of transcription activation. Reactivation of paused Pol II correlates with recruitment of SuperElongationComplexes (SECs) containing ELL/EAF family members, P-TEFb, and other proteins, but the mechanism of their recruitment is currently a major unanswered question. Here, we present evidence for a role of human Mediator subunit Med26 in this process. We identify in the conserved N-terminal domain of Med26 overlapping docking sites for SEC and a second ELL/EAF-containing complex, as well as general initiation factor TFIID. In addition, we present evidence consistent with the model that Med26 can function as a molecular switch that interacts first with TFIID in the Pol II initiation complex and then exchanges TFIID for complexes containing ELL/EAF and P-TEFb to facilitate transition of Pol II into the elongation stage of transcription.
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Metadata
- Authors
- Takahashi, H., Parmely, T. J., Sato, S., Tomomori-Sato, C., Banks, C. A. S., Kong, S. E., Szutorisz, H., Swanson, S. K., Martin-Brown, S., Washburn, M. P., Florens, L., Seidel, C. W., Lin, C., Smith, E. R., Shilatifard, A., Conaway, R. C., & Conaway, J. W.
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2011-07
- Volume
- 146
- Issue
- 1
- Pages
- 92-104
- ISSN
- 0092-8674 (ISSN-L)
- OpenAlex
- W1984901090
- Cited by
- 347
- References
- 74
- FWCI
- 13.40
- Type
- journal article
- Language
- en
- Open access
- bronze
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