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Mol. Cell. Biol., Apr 1996, 1614-1621, Vol 16, No. 4
Y Jiang, M Yan and JD Gralla
The progress of transcription bubbles during inhibition in vitro was
followed in order to learn how RNA polymerase II begins transcription at
the activated adenovirus E4 promoter. The issues addressed include the
multiple roles of ATP, the potential effect of polymerase C- terminal
domain phosphorylation, and the ability of polymerase to clear the promoter
for reinitiation. The results lead to a three-step model for the transition
from closed complex to elongation complex, two steps of which use ATP
independently. In the first step, studied previously, ATP is hydrolyzed to
open the DNA strands over the start site. In a second step, apparently
independent of ATP, transcription bubbles move into the initial transcribed
region where RNA synthesis can stall. In the third step, transcripts can be
made as polymerase is released from these stalled positions with the
assistance of an ATP-dependent process, likely phosphorylation of the
polymerase C-terminal domain. After this third step, the promoter becomes
cleared, allowing for the reinitiation of transcription.
Copyright © 1996, American Society for Microbiology
A three-step pathway of transcription initiation leading to promoter clearance at an activation RNA polymerase II promoter
Department of Chemistry and Biochemistry, University of California at Los Angeles, 90095-1569, USA.
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