TAF25p, a non-histone-like subunit of TFIID and SAGA complexes, is essential for total mRNA gene transcription in vivo.

Sanders SL, Klebanow ER, Weil PA
J Biol Chem. 1999 274 (27): 18847-50

PMID: 10383379 · DOI:10.1074/jbc.274.27.18847

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.

MeSH Terms (14)

Alleles Cloning, Molecular DNA-Binding Proteins Escherichia coli Fungal Proteins Hydroxylamine RNA, Messenger Saccharomyces cerevisiae Proteins TATA-Binding Protein Associated Factors Temperature Transcription, Genetic Transcription Factors, TFII Transcription Factor TFIID Yeasts

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