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Mediator (coactivator): Wikis


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Mediator is a multiprotein complex that functions as a transcriptional coactivator. It was discovered by Roger D. Kornberg, winner of the 2006 Nobel Prize in Chemistry. It is also referred to in scientific literature as the Vitamin D Receptor Interacting Protein (DRIP) coactivator complex and the Thyroid Hormone Receptor-associated Proteins (TRAP).

The Mediator complex is required for the successful transcription of nearly all class II gene promoters in yeast.[1] It works in the same manner in mammals. The mediator functions as a coactivator and binds to the C-terminal domain of RNA polymerase II holoenzyme, acting as a bridge between this enzyme and transcription factors.[2] [3]

Component proteins

Human genes which encoded component proteins of the mediator complex include:


  1. ^ Biddick R, Young ET (2005). "Yeast mediator and its role in transcriptional regulation". C. R. Biol. 328 (9): 773–82. doi:10.1016/j.crvi.2005.03.004. PMID 16168358.  
  2. ^ Björklund S, Gustafsson CM (2005). "The yeast Mediator complex and its regulation". Trends Biochem. Sci. 30 (5): 240–4. doi:10.1016/j.tibs.2005.03.008. PMID 15896741.  
  3. ^ Reeves, Wendy M.; Hahn, Steve (January 2003), "Activator-Independent Functions of the Yeast Mediator Sin4 Complex in Preinitiation Complex Formation and Transcription Reinitiation", Molecular and Cellular Biology 23: 349–358,  


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