Peter Weil
Faculty Member
Last active: 11/4/2015

Histone folds mediate selective heterodimerization of yeast TAF(II)25 with TFIID components yTAF(II)47 and yTAF(II)65 and with SAGA component ySPT7.

Gangloff YG, Sanders SL, Romier C, Kirschner D, Weil PA, Tora L, Davidson I
Mol Cell Biol. 2001 21 (5): 1841-53

PMID: 11238921 · PMCID: PMC86751 · DOI:10.1128/MCB.21.5.1841-1853.2001

We show that the yeast TFIID (yTFIID) component yTAF(II)47 contains a histone fold domain (HFD) with homology to that previously described for hTAF(II)135. Complementation in vivo indicates that the yTAF(II)47 HFD is necessary and sufficient for vegetative growth. Mutation of highly conserved residues in the alpha1 helix of the yTAF(II)47 HFD results in a temperature-sensitive phenotype which can be suppressed by overexpression of yTAF(II)25, as well as by yTAF(II)40, yTAF(II)19, and yTAF(II)60. In yeast two-hybrid and bacterial coexpression assays, the yTAF(II)47 HFD selectively heterodimerizes with yTAF(II)25, which we show contains an HFD with homology to the hTAF(II)28 family We additionally demonstrate that yTAF(II)65 contains a functional HFD which also selectively heterodimerizes with yTAF(II)25. These results reveal the existence of two novel histone-like pairs in yTFIID. The physical and genetic interactions described here show that the histone-like yTAF(II)s are organized in at least two substructures within TFIID rather than in a single octamer-like structure as previously suggested. Furthermore, our results indicate that ySPT7 has an HFD homologous to that of yTAF(II)47 which selectively heterodimerizes with yTAF(II)25, defining a novel histone-like pair in the SAGA complex.

MeSH Terms (21)

Amino Acid Sequence beta-Galactosidase Cell Division Dimerization Genetic Complementation Test Histones Lac Operon Models, Genetic Molecular Sequence Data Phenotype Plasmids Protein Folding Protein Structure, Tertiary Recombinant Proteins Saccharomyces cerevisiae Proteins Sequence Homology, Amino Acid Temperature Transcription Factors Transcription Factors, TFII Transcription Factor TFIID Two-Hybrid System Techniques

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