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. 2009 May 7;4(5):e5479. doi: 10.1371/journal.pone.0005479

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Alignment created using T-Coffee alignment algorithm, default parameters, with minor adjustments made by hand [20]. Green arrows represent beta-strands, and red cylinders represent alpha-helices. Black rounded box shows the interdomain connecting loop, blue shaded boxes represent the helices that contribute to DNA binding and dots represent identical residues between the 3 protein sequences. Residue marked with an asterisk is the conserved ubiquitylation/SUMOylation site. Secondary structure was derived directly from the crystal structures of the human and yeast PCNA proteins and the structural model of the VACV G8R protein.