Mediator (coactivator) - Wikipedia
Mediator is a multiprotein complex that functions as a transcriptionalcoactivator in all eukaryotes. It was discovered in 1990 in the lab of Roger D. Kornberg, recipient of the 2006 Nobel Prize in Chemistry.[1][2] Mediator[a] complexes interact with transcription factors and RNA polymerase II. The main function of mediator complexes is to transmit signals from the transcription factors to the polymerase.[3] Mediator complexes are variable at the evolutionary, compositional and conformational levels.[3] The first image shows only one "snapshot" of what a particular mediator complex might be composed of,[b] but it certainly does not accurately depict the conformation of the complex in vivo. During evolution, mediator has become more complex. The yeast Saccharomyces cerevisiae (a simple eukaryote) is thought to have up to 21 subunits in the core mediator (exclusive of the CDK module), while mammals have up to 26. Individual subunits can be absent or replaced by other subunits under differ
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