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. 2021 May 22;38(9):3789–3803. doi: 10.1093/molbev/msab157

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© The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 5. — Bacterial BbCuZnSOD dimerizes through an E-class interface. (A) Structure of homodimeric BbCuZnSOD showing tertiary and quaternary structure similarity to human SOD1 (2C9V). (B) Surface charge map showing the BbCuZnSOD interface is composed of a nonpolar patch which is conserved in human SOD1. (C) The BbCuZnSOD interface maintains E-class intersubunit hydrogen bonding using the same amino acid type, bond lengths, and angles as human SOD1. (D) Surface charge map showing BbCuZnSOD does not exhibit a nonpolar region which contributes to P-class homodimerization as exemplified by Photobacterium leiognathi PhCuZnSOD (1YAI) and has very poor conservation (9% identity) of interface residues (highlighted orange).