Reference: Asturias FJ, et al. (1999) Conserved structures of mediator and RNA polymerase II holoenzyme. Science 283(5404):985-7

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Abstract


Single particles of the mediator of transcriptional regulation (Mediator) and of RNA polymerase II holoenzyme were revealed by electron microscopy and image processing. Mediator alone appeared compact, but at high pH or in the presence of RNA polymerase II it displayed an extended conformation. Holoenzyme contained Mediator in a fully extended state, partially enveloping the globular polymerase, with points of apparent contact in the vicinity of the polymerase carboxyl-terminal domain and the DNA-binding channel. A similarity in appearance and conformational behavior of yeast and murine complexes indicates a conservation of Mediator structure among eukaryotes.

Reference Type
Journal Article
Authors
Asturias FJ, Jiang YW, Myers LC, Gustafsson CM, Kornberg RD
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