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. 2011 Jul 22;6(7):e22013. doi: 10.1371/journal.pone.0022013

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Xu et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(a) Residues essential for the catalytic activity of papain-like NlpC/P60 enzymes: BcYkfC (green; Cys238, His291, His303 and Tyr226), BcPPNE (cyan; Cys154, His49, Glu64 and Tyr127), YiiX (magenta; Cys128, His49, Glu64 and Tyr115) and human PPPDE1 (yellow; Cys108, His38, Glu47, and Tyr101; red; water). Residue numbers are from BcPPNE. (b) Bound lysine identified in the active site. The omit density (Fo-Fc) is contoured at 4.5σ. Hydrogen bonds are shown in dashed lines.