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. 2017 May 18;7:2083. doi: 10.1038/s41598-017-02292-0

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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MrNV P-domains show a pronounced rotation between AB and CC dimers – the quasi-equivalent positions for dimeric capsomeres in a T = 3 icosahedral virus capsid. (a) A stereo pair of the MrNV reconstruction viewed along an icosahedral three-fold symmetry axis. In T = 3 icosahedral capsids, a local six-fold quasi-symmetry axis lies at this point. The locations of icosahedral five-fold and local quasi-six-fold symmetry axes are highlighted by a ‘soccer-ball’ cage. (b) Dimer clustered T = 3 icosahedral capsids, such as our recently published structure for feline calicivirus have AB and CC P-dimers arranged alternating about the quasi-six-fold axes. Here the positions of such are indicated by red arrows (AB) and yellow arrows (CC). If the structures of AB and CC dimers are not radically different, we expect the position and orientation of these features to be related by an approximately 60° rotation about the local six-fold symmetry axis (indicated by a pink hexagon). (c) In the case of the MrNV P-dimers, the CC P-dimers are rotated approximately 105° relative to the orientation of the AB P-dimers. The radial colour scheme in panel (b) indicates the radial depth cue scale in angstroms for the FCV reconstruction only.