The yeast regulator of transcription protein Rtr1 lacks an active site and phosphatase activity

Kehui Xiang, James L. Manley and Liang Tong ()
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Kehui Xiang: Columbia University
James L. Manley: Columbia University
Liang Tong: Columbia University

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract The activity of RNA polymerase II (Pol II) is controlled in part by the phosphorylation state of the C-terminal domain (CTD) of its largest subunit. Recent reports have suggested that yeast regulator of transcription protein, Rtr1, and its human homologue RPAP2, possess Pol II CTD Ser5 phosphatase activity. Here we report the crystal structure of Kluyveromyces lactis Rtr1, which reveals a new type of zinc finger protein and does not have any close structural homologues. Importantly, the structure does not show evidence of an active site, and extensive experiments to demonstrate its CTD phosphatase activity have been unsuccessful, suggesting that Rtr1 has a non-catalytic role in CTD dephosphorylation.

Date: 2012
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DOI: 10.1038/ncomms1947

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