Molecular genetic dissection of TAF25, an essential yeast gene encoding a subunit shared by TFIID and SAGA multiprotein transcription factors.

Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0615, USA.
We have performed a systematic structure-function analysis of Saccharomyces cerevisiae TAF25, an evolutionarily conserved, single-copy essential gene which encodes the 206-amino-acid TAF25p protein. TAF25p is an integral subunit of both the 15-subunit general transcription factor TFIID and the multisubunit, chromatin-acetylating transcriptional coactivator SAGA. We used hydroxylamine mutagenesis, targeted deletion, alanine-scanning mutagenesis, high-copy suppression methods, and two-hybrid screening to dissect TAF25. Temperature-sensitive mutant strains generated were used for coimmunoprecipitation and transcription analyses to define the in vivo functions of TAF25p. The results of these analyses show that TAF25p is comprised of multiple mutable elements which contribute importantly to RNA polymerase II-mediated mRNA gene transcription.
Mesh Terms:
Amino Acid Sequence, Conserved Sequence, DNA-Binding Proteins, Fungal Proteins, Gene Expression Regulation, Fungal, Genes, Fungal, Macromolecular Substances, Molecular Sequence Data, Mutation, Protein Subunits, RNA Polymerase II, RNA, Fungal, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Sequence Homology, Amino Acid, Structure-Activity Relationship, TATA-Binding Protein Associated Factors, Trans-Activators, Transcription Factor TFIID, Transcription Factors, TFII, Two-Hybrid System Techniques
Mol. Cell. Biol. Oct. 01, 2001; 21(19);6668-80 [PUBMED:11533254]
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