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. 2011 Mar 1;6(3):e17403. doi: 10.1371/journal.pone.0017403

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Schulz 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) Overview about the three-dimensional structure of NeuO with each monomer displayed in a different color in cartoon mode; top and bottom views are given. Monomers are tilted by almost 45° with respect to each other. (B) A single monomer of NeuO is displayed from both sides; the annotation for every secondary structure element is indicated. (C) Representation of the electrostatic surface potential of the NeuO trimer, displayed from −15 to 15 k_bT, calculated using the program APBS. [44]. Most of the surface is positively charged (blue) suited to bind to the poly-anionic acceptor substrate polySia.