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Mol. Cell. Biol., 10 1995, 5757-5761, Vol 15, No. 10
H Xiao, JD Friesen and JT Lis
The binding of TATA-binding protein (TBP) to the TATA element is the first
step in the initiation of RNA polymerase II transcription from many
promoters in vitro. It has been proposed that upstream activator proteins
stimulate transcription by recruiting TBP to the promoter, thus
facilitating the assembly of a transcription complex. However, the role of
activator proteins acting at this step to stimulate transcription in vivo
remains largely speculative. To test whether recruitment of TBP to the
promoter is sufficient for transcriptional activation in vivo, we
constructed a hybrid protein containing TBP of the yeast Saccharomyces
cerevisiae fused to the DNA-binding domain of GAL4. Our results show that
TBP recruited by the GAL4 DNA-binding domain to promoters bearing a
GAL4-binding site can interact with the TATA element and direct high levels
of transcription. This finding indicates that binding of TBP to promoters
in S. cerevisiae is a major rate-limiting step accelerated by upstream
activator proteins.
Copyright © 1995, American Society for Microbiology
Recruiting TATA-binding protein to a promoter: transcriptional activation without an upstream activator
Section of Biochemistry, Molecular and Cell Biology, Cornell University, Ithaca, New York 14853, USA.
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