Structural highlights
Function[TFC7_YEAST] TFIIIC mediates tRNA and 5S RNA gene activation by binding to intragenic promoter elements. Upstream of the transcription start site, TFIIIC assembles the initiation complex TFIIIB-TFIIIC-tDNA, which is sufficient for RNA polymerase III recruitment and function. Part of the tauA domain of TFIIIC that binds boxA DNA promoter sites of tRNA and similar genes.[1] Publication Abstract from PubMedSaccharomyces cerevisiae tau55, a subunit of the RNA polymerase III-specific general transcription factor TFIIIC, comprises an N-terminal histidine phosphatase domain (tau55-HPD) whose catalytic activity and cellular function is poorly understood. We solved the crystal structures of tau55-HPD and its closely related paralogue Huf and used in silico docking methods to identify phospho-serine and phospho-tyrosine containing peptides as possible substrates that were subsequently validated using in vitro phosphatase assays. A comparative phospho-proteomic study identified additional phosphopeptides as possible targets, which show the involvement of these two phosphatases in the regulation of a variety of cellular functions. Our results identify tau55-HPD and Huf as bona fide protein phosphatases, characterize their substrate specificities and provide a small set of regulated phosphosite targets in vivo. Structural and functional characterization of a phosphatase domain within yeast general transcription factor TFIIIC.,Taylor NM, Glatt S, Hennrich ML, von Scheven G, Grotsch H, Fernandez-Tornero C, Rybin V, Gavin AC, Kolb P, Muller CW J Biol Chem. 2013 Apr 8. PMID:23569204[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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