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Structural Basis of Transcription: RNA Polymerase II at 2.8 Ångstrom Resolution
Patrick Cramer,*David A. Bushnell,Roger D. Kornberg
Structures of a 10-subunit yeast RNA polymerase II have been
derived from two crystal forms at 2.8 and 3.1 angstrom resolution.Comparison of the structures reveals a division of the polymeraseinto
four mobile modules, including a clamp, shown previouslyto swing over
the active center. In the 2.8 angstrom structure,the clamp is in an
open state, allowing entry of straight promoterDNA for the initiation
of transcription. Three loops extendingfrom the clamp may play roles
in RNA unwinding and DNA rewindingduring transcription. A 2.8 angstrom
difference Fourier map revealstwo metal ions at the active site, one
persistently bound andthe other possibly exchangeable during RNA
synthesis. The resultsalso provide evidence for RNA exit in the
vicinity of the carboxyl-terminalrepeat domain, coupling synthesis to
RNA processing by enzymesbound to this domain.
Department of Structural Biology, Stanford University School of
Medicine, Stanford, CA 94305-5126, USA.
*
Present address: Institute of Biochemistry, Gene Center,
University of Munich, 81377 Munich, Germany.
To whom correspondence should be addressed. E-mail:
kornberg{at}stanford.edu
The editors suggest the following Related Resources on Science sites:
In Science Magazine
RESEARCH ARTICLES
Averell L. Gnatt, Patrick Cramer, Jianhua Fu, David A. Bushnell, and Roger D. Kornberg (8 June 2001) Science292 (5523), 1876.
[DOI: 10.1126/science.1059495] |Abstract »|Full Text »|PDF »
PERSPECTIVES
Aaron Klug (8 June 2001) Science292 (5523), 1844.
[DOI: 10.1126/science.1062384] |Summary »|Full Text »
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