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Mol. Cell. Biol., 11 1995, 6465-6473, Vol 15, No. 11
N Kobayashi, TG Boyer and AJ Berk
TFIIA is a general transcription factor that interacts with the TFIID-
promoter complex required for transcription initiation by RNA polymerase
II. Two lines of evidence suggest that TFIIA is directly involved in the
mechanism by which some activators stimulate transcription. First, binding
of TFIIA to a TFIID-promoter complex is a rate-limiting step that is
enhanced by transcriptional activators GAL4- AH and Zta. Second,
recombinant TFIIA greatly enhances activator- dependent transcription. In
this study, we found that the activation domains of Zta and VP16 bind
directly to TFIIA. Both Zta and VP16 stimulated rapid assembly of a stable
TFIID-TFIIA complex on promoter DNA. Analysis of deletion derivatives of
the VP16 activation domain indicated that the ability to bind to TFIIA
correlates with the ability to enhance TFIID-TFIIA-promoter ternary complex
assembly. Thus, we propose that a class of activators stimulate
transcription initiation through direct interactions with both TFIIA and
TFIID, which stimulate the assembly of an activated TFIIA-TFIID-promoter
complex.
Copyright © 1995, American Society for Microbiology
A class of activation domains interacts directly with TFIIA and stimulates TFIIA-TFIID-promoter complex assembly
Molecular Biology Institute, University of California, Los Angeles 90024-1570, USA.
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