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J Biol Chem, Vol. 274, Issue 27, 18847-18850, July 2, 1999
From the Department of Molecular Physiology and Biophysics,
Vanderbilt University, School of Medicine,
Nashville, Tennessee 37232-0615
We demonstrate, utilizing a temperature
conditional mutant allele of the gene encoding TAF25p, that this
non-histone-like TBP-associated factor, which is shared between the
TFIID and SAGA complexes, is required for bulk mRNA gene
transcription by RNA polymerase II in vivo. Immunoblotting
experiments indicate that at the restrictive temperature, inactivation
of TAF25p function results in a reduction of the levels of numerous
TFIID and SAGA subunits, indicating its loss of function, like the
histone-like TAFs, causes degradation of the constituents of these two
multisubunit complexes. These data suggest that TAF25p plays a key
structural role in maintaining TFIID and SAGA complex integrity. This
is the first demonstration that a non-histone-like TAF is required for
continuous, high level RNA polymerase II-mediated mRNA gene transcription in living yeast cells.
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