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J Biol Chem, Vol. 275, Issue 20, 14923-14932, May 19, 2000
From the Section of Molecular and Cellular Biology, Division of
Biological Sciences, University of California,
Davis, California 95616
The phosphorylation state of the
carboxyl-terminal domain (CTD) of the largest RNA polymerase (RNAP) II
subunit plays an important role in the regulation of transcript
elongation. This report examines the sensitivity of RNAP II to
dephosphorylation by CTD phosphatase (CTDP) and addresses factors that
regulate its sensitivity. The CTDP sensitivity of RNAP IIO in paused
elongation complexes on a dC-tailed template does not significantly
differ from that of free RNAP IIO. RNAP IIO contained in elongation
complexes that initiate transcription from the adenovirus-2 major late
promoter in the presence of a nuclear extract is relatively resistant
to dephosphorylation. Complexes treated with 1% Sarkosyl remain
elongation-competent but demonstrate a 5-fold increase in CTDP
sensitivity. Furthermore, the sensitivity of RNAP IIO in both control
and Sarkosyl-treated elongation complexes is dependent on their
position relative to the start site of transcription. Elongation
complexes 11-24 nucleotides downstream are more sensitive to
dephosphorylation than complexes 50-150 nucleotides downstream. The
incubation of Sarkosyl-treated elongation complexes with nuclear
extract restores the original resistance to dephosphorylation. These
results suggest that a conformational change occurs in RNAP II as it
clears the promoter, which results in an increased resistance to
dephosphorylation. Furthermore, the sensitivity to dephosphorylation
can be modulated by a factor(s) present in the nuclear extract.
The Sensitivity of RNA Polymerase II in Elongation Complexes to
C-terminal Domain Phosphatase*
*
This work was supported by National Institutes of Health
Grant GM-33300 (to M. E. D.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
To whom correspondence should be addressed. Tel.: 530-752-3551;
Fax: 530-752-3085; E-mail: medahmus@ucdavis.edu.
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