2YN0 image
Entry Detail
PDB ID:
2YN0
Keywords:
Title:
tau55 histidine phosphatase domain
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-10-11
Release Date:
2013-04-03
Method Details:
Experimental Method:
Resolution:
1.50 Å
R-Value Free:
0.18
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:TRANSCRIPTION FACTOR TAU 55 KDA SUBUNIT
Chain IDs:A
Chain Length:271
Number of Molecules:1
Biological Source:SACCHAROMYCES CEREVISIAE
Ligand Molecules
Primary Citation
Structural and Functional Characterization of a Phosphatase Domain within Yeast General Transcription Factor Iiic.
J.Biol.Chem. 288 15110 ? (2013)
PMID: 23569204 DOI: 10.1074/JBC.M112.427856

Abstact

Saccharomyces cerevisiae τ55, a subunit of the RNA polymerase III-specific general transcription factor TFIIIC, comprises an N-terminal histidine phosphatase domain (τ55-HPD) whose catalytic activity and cellular function is poorly understood. We solved the crystal structures of τ55-HPD and its closely related paralogue Huf and used in silico docking methods to identify phosphoserine- and phosphotyrosine-containing peptides as possible substrates that were subsequently validated using in vitro phosphatase assays. A comparative phosphoproteomic study identified additional phosphopeptides as possible targets that show the involvement of these two phosphatases in the regulation of a variety of cellular functions. Our results identify τ55-HPD and Huf as bona fide protein phosphatases, characterize their substrate specificities, and provide a small set of regulated phosphosite targets in vivo.

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