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Mol Cell Biol, June 1998, p. 3234-3244, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Involvement of TFIID and USA Components in
Transcriptional Activation of the Human Immunodeficiency Virus Promoter
by NF-
B and Sp1
Mohamed
Guermah,
Sohail
Malik, and
Robert G.
Roeder*
Laboratory of Biochemistry and Molecular
Biology, The Rockefeller University, New York, New York 10021
Received 16 December 1997/Accepted 20 March 1998
The purified Rel/NF-
B (p50/p65) complex and Sp1 markedly
activate transcription from the human immunodeficiency virus type 1 (HIV-1) promoter in a highly purified HeLa reconstituted transcription system. Transcriptional activation by NF-
B and Sp1 requires both TFIID and the USA fraction. The USA-derived coactivators PC2 and PC4
fully reconstitute the USA coactivator activity, both by repressing the
basal level of transcription and by potentiating activator function to
yield large increases in the levels of transcription induction. Under
limiting concentrations, PC2 and PC4 also show synergistic effects. The
C-terminal portion (amino acids 416 to 550) of the p65 subunit of
NF-
B is a potent activator when assayed as a Gal fusion in the
reconstituted transcription system and interacts both with TATA-binding
protein (TBP) and with several human TBP-associated factors (TAFs) that
include TAFII250. The p65 activation domain mediates
transcription activation in the presence of partially reconstituted
TFIID species that include a minimal complex containing only TBP and
TAFII250. These studies also show that, like USA
components, TAFs can serve both to repress TBP-mediated transcription
and, following activator interactions, to reverse the repression and
effect a net increase in activity. Taken together, these data
underscore the importance of both TAFs and specific USA-derived
coactivators for optimal activation of the HIV-1 promoter, as well as
certain parallels in their overall mechanisms of action.
*
Corresponding author. Mailing address: Laboratory of
Biochemistry and Molecular Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10021. Phone: (212) 327-7601. Fax: (212) 327-7949. E-mail: roeder{at}rockvax.rockefeller.edu.
Mol Cell Biol, June 1998, p. 3234-3244, Vol. 18, No. 6
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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