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J. Biol. Chem., Vol. 276, Issue 1, 395-405, January 5, 2001
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From the Division of Gene Function in Animals, Nara Institute of
Science and Technology, 8916-5 Takayama, Ikoma,
Nara 630-0101, Japan
The general transcription factor TFIID, which is
composed of the TATA box-binding protein (TBP) and a set of
TBP-associated factors (TAFs), is crucial for both basal and regulated
transcription by RNA polymerase II. The N-terminal small segment of
yeast TAF145 (yTAF145) binds to TBP and thereby inhibits TBP function.
To understand the physiological role of this inhibitory domain, which
is designated as TAND (TAF N-terminal
domain), we screened mutations, synthetically lethal with
the TAF145 gene lacking TAND
(taf145
Mutations in the TATA-binding Protein, Affecting Transcriptional
Activation, Show Synthetic Lethality with the TAF145
Gene Lacking the TAF N-terminal Domain in Saccharomyces
cerevisiae*
,
TAND), in Saccharomyces cerevisiae by exploiting a red/white colony-sectoring assay. Our screen yielded several recessive nsl (
TAND
synthetic lethal) mutations, two of which,
nsl1-1 and nsl1-2, define the same
complementation group. The NSL1 gene was found to be
identical to the SPT15 gene encoding TBP. Interestingly,
both temperature-sensitive nsl1/spt15 alleles, which harbor
the single amino acid substitutions, S118L and P65S, respectively, were
defective in transcriptional activation in vivo. Several
other previously characterized activation-deficient spt15
alleles also displayed synthetic lethal interactions with taf145
TAND, indicating that TAND and TBP
carry an overlapping but as yet unidentified function that is
specifically required for transcriptional regulation.
*
This study was supported by grants from the Ministry of
Education, Science, and Culture of Japan, by the CREST Japan Science and Technology Corp., the Uehara Memorial Foundation, the Asahi Glass
Foundation, the NAITO Foundation, the Sumitomo Foundation, and NOVARTIS
Foundation for the Promotion of Science.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Present address: Dept. of Biochemistry and Molecular Genetics,
Health Sciences Center, University of Virginia, Charlottesville, VA 22908.
§
To whom correspondence should be addressed: Division of Gene
Function in Animals, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan. Tel.: 81-743-72-5531; Fax:
81-743-72-5539; E-mail: kokubo@bs.aist-nara.ac.jp.
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