Journal
CURRENT OPINION IN GENETICS & DEVELOPMENT
Volume 14, Issue 2, Pages 218-226Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/j.gde.2004.01.003
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New structural studies of RNA polymerase II (Pol II) complexes mark the beginning of a detailed mechanistic analysis of the eukaryotic mRNA transcription cycle. Crystallographic models of the complete Pol II, together with new biochemical and electron microscopic data, give insights into transcription initiation. The first X-ray analysis of a Pol II complex with a transcription factor, the elongation factor THS, supports the idea that the polymerase has a 'tunable' active site that switches between mRNA synthesis and cleavage. The new studies also show that domains of transcription factors can enter polymerase openings, to modulate function during transcription.
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