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. 2017 Oct 2;7:12525. doi: 10.1038/s41598-017-12979-z

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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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Surface electrostatic potentials analysis. (A) Surface electrostatic potentials of nahA3, and Naphthalene 1,2-dioxygenase from Pseudomonas putida NCIB 9816–4 (PDB no. 1O7N) as obtained using Discovery Studio 2.5 software. The first, second and third line were seen from the front, top and left of the structures, respectively, with the red surface corresponding to negatively charged residues and the blue surface corresponding to positively charged residues (color figure online). (B) The key amino acid sites in nahAc. Fe²⁺ binding sites are labelled in black squares and the sequence near these active sites are also shown. Mutated amino acid sites are labelled in red frame. (C) The position of these mutated sites appear at the surface of the large subunit. This graph is illustrated by Swiss-pdb viewer.