TAF25p, a non-histone-like subunit of TFIID and SAGA complexes, is essential for total mRNA gene transcription in vivo.
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.
Sanders
S L
SL
Department of Molecular Physiology and Biophysics, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232-0615, USA.
Klebanow
E R
ER
Weil
P A
PA
D000483:Alleles; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology*; D004926:Escherichia coli; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D019811:Hydroxylamine / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D035381:TATA-Binding Protein Associated Factors; D013696:Temperature; D035362:Transcription Factor TFIID; D019473:Transcription Factors, TFII / Q000737:chemistry / Q000378:metabolism; D014158:Transcription, Genetic; D015003:Yeasts / Q000235:genetics / Q000378:metabolism
D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D012333:RNA, Messenger; C118425:SAGA protein, Emericella nidulans; D029701:Saccharomyces cerevisiae Proteins; C100497:TAF10 protein, S cerevisiae; D035381:TATA-Binding Protein Associated Factors; D035362:Transcription Factor TFIID; D019473:Transcription Factors, TFII; D019811:Hydroxylamine