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Molecular and Cellular Biology, June 1999, p. 4241-4246, Vol. 19, No. 6
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Specificity of Cyclin E-Cdk2, TFIIB, and E1A
Interactions with a Common Domain of the p300 Coactivator
Lisa K.
Felzien,
Susan
Farrell,
Jonathan C.
Betts,
Rashid
Mosavin,
and
Gary
J.
Nabel*
Howard Hughes Medical Institute, University
of Michigan Medical Center, Departments of Internal Medicine and
Biological Chemistry, Ann Arbor, Michigan 48109-0650
Received 8 September 1998/Returned for modification 8 December
1998/Accepted 24 March 1999
The p300 and CREB binding protein (CBP) transcriptional
coactivators interact with a variety of transcription factors and regulate their activity. Among the interactions that have been described, the COOH-terminal region of p300 binds to cyclin
E-cyclin-dependent kinase 2 (cyclin E-Cdk2) and TFIIB, as well as to
the E1A gene products of adenovirus. Inhibition of Cdk activity by Cdk
inhibitors, such as p21 or p27, potentiates NF-
B activity and
provides a mechanism to coordinate cell cycle progression with the
transcription of genes expressed during growth arrest. In this report,
we analyze the specific domains of p300 required for the binding of
p300 to cyclin E-Cdk2, TFIIB, and E1A and the ability of these proteins to interact with p300, alone or in combination. 12S E1A, an inhibitor of p300-dependent transcription, reduces the binding of TFIIB, but not
that of cyclin E-Cdk2, to p300. In contrast, 13S E1A, a pleiotropic
transcriptional activator, does not inhibit TFIIB binding to p300,
although it enhances the interaction of cyclin E-Cdk2 with p300.
Modification of cyclin E-Cdk2 is most likely required for association
with p300 since the interaction is observed only with cyclin E-Cdk2
purified from mammalian cells. Domain swap studies show that the cyclin
homology domain of TFIIB is involved in interactions with p300,
although the homologous region from cyclin E does not mediate this
interaction. These findings suggest that p300 or CBP function is
regulated by interactions of various proteins with a common coactivator domain.
*
Corresponding author. Mailing address: Howard Hughes
Medical Institute, University of Michigan Health Center, Departments of
Internal Medicine and Biological Chemistry, 1150 W. Medical Center Dr.,
MSRB I, Ann Arbor, MI 48109-0650. Phone: (734) 647-4798. Fax: (734)
647-4730. E-mail: gnabel{at}umich.edu.

Present address: University of Kansas Medical School, Department of
Anatomy and Cell Biology, Kansas City, KS
66160.

Present address: Henry Ford Hospital, Department of Pharmacy
Services, Detroit, MI 48202-2689.
Molecular and Cellular Biology, June 1999, p. 4241-4246, Vol. 19, No. 6
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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