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J. Biol. Chem., Vol. 276, Issue 14, 10913-10920, April 6, 2001
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From the CDK7, CDK8, and CDK9 are
cyclin-dependent kinases (CDKs) that phosphorylate the
C-terminal domain (CTD) of RNA polymerase II. They have distinct
functions in transcription. Because the three CDKs target only serine 5 in the heptad repeat of model CTD substrates containing various numbers
of repeats, we tested the hypothesis that the kinases differ in their
ability to phosphorylate CTD heptad arrays. Our data show that the
kinases display different preferences for phosphorylating individual
heptads in a synthetic CTD substrate containing three heptamer repeats
and specific regions of the CTD in glutathione
S-transferase fusion proteins. They also exhibit
differences in their ability to phosphorylate a synthetic CTD peptide
that contains Ser-2-PO4. This phosphorylated peptide is a
poor substrate for CDK9 complexes. CDK8 and CDK9 complexes, bound to
viral activators E1A and Tat, respectively, target only serine 5 for
phosphorylation in the CTD peptides, and binding to the viral
activators does not change the substrate preference of these kinases.
These results imply that the display of different CTD heptads during
transcription, as well as their phosphorylation state, can affect their
phosphorylation by the different transcription-associated CDKs.
Department of Biochemistry and Molecular
Biology, New Jersey Medical School, University of Medicine and
Dentistry of New Jersey, Newark, New Jersey 07103, the
Department of Cell Signaling, DNAX Research Institute, Palo
Alto, California 94304-1104, and the ** Molecular Biology Program,
Sloan-Kettering Institute, New York, New York 10021

To whom correspondence should be addressed: Dept. of
Biochemistry and Molecular Biology, New Jersey Medical School,
University of Medicine and Dentistry of New Jersey, Newark, NJ 07103. Tel.: 973-972-8763; Fax: 973-972-5594; E-mail:
peeryts@umdnj.edu.
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