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Mol Cell Biol, August 1998, p. 4639-4650, Vol. 18, No. 8
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Transcription Factor Pip Can Enhance DNA Binding by
E47, Leading to Transcriptional Synergy Involving Multiple
Protein Domains
Sujatha
Nagulapalli and
Michael L.
Atchison*
Department of Animal Biology, School of
Veterinary Medicine, University of Pennsylvania, Philadelphia,
Pennsylvania 19104-6046
Received 26 November 1997/Returned for modification 7 January
1998/Accepted 11 May 1998
The transcription factors E2A (E12/E47) and Pip are both required
for normal B-cell development. Each protein binds to regulatory sequences within various immunoglobulin enhancer elements. Activity of
E2A proteins can be regulated by interactions with other proteins which
influence their DNA binding or activation potential. Similarly, Pip
function can be influenced by interaction with the protein PU.1, which
can recruit Pip to bind to DNA. We show here that a previously
unidentified Pip binding site resides adjacent to the E2A binding site
within the immunoglobulin
3' enhancer. Both of these binding sites
are crucial for high-level enhancer activity. We found that E47 and Pip
can functionally interact to generate a very potent 100-fold
transcriptional synergy. Through a series of mutagenesis experiments,
we identified the Pip sequences necessary for transcriptional
activation and for synergy with E47. Two synergy domains (residues 140 to 207 and 300 to 420) in addition to the Pip DNA binding domain
(residues 1 to 134) are required for maximal synergy with E47. We also
identified a Pip domain (residues 207 to 300) that appears to mask Pip
transactivation potential. Part of the synergy mechanism between E47
and Pip appears to involve the ability of Pip to increase DNA binding
by E47, perhaps by inducing a conformational change in the E47 protein. E47 may also induce a conformational change in Pip which unmasks sequences important for transcriptional activity. Based upon our results, we propose a model for E47-Pip transcriptional synergy.
*
Corresponding author. Mailing address: University of
Pennsylvania, School of Veterinary Medicine, 3800 Spruce St.,
Philadelphia, PA 19104. Phone: (215) 898-6428. Fax: (215) 898-9923. E-mail: atchison{at}vet.upenn.edu.
Mol Cell Biol, August 1998, p. 4639-4650, Vol. 18, No. 8
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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