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. 2017 Apr 26;7:1195. doi: 10.1038/s41598-017-01179-4

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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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Relative surface accessibility (RSA) treemap of Cys residues identified in the redox proteome of M. smegmatis using OxICAT. The surface accessibilities of Cys residues were predicted using the NetSurfP server ver. 1.1 http://www.cbs.dtu.dk/services/NetSurfP/. The RSA treemap is composed of 1332 Cys residues identified in the redox proteome of the M. smegmatis wild type and the mshC mutant. Proteins are classified according to the M. smegmatis TIGRfam annotation. The treemap in (A) serves as legend for the functional classification of the proteins shown in the treemap in (B). The cells in the treemap represent Cys residues that are color-coded according to their relative surface accessibilities (RSA) with a white-orange-red color gradient ranging from 0–75% RSA. Exposed Cys are orange and buried Cys are shown in white-grey. In total, about 180 Cys residues (13.5%) in 163 proteins have a RSA value of >20% indicating that a majority of Cys residues are not surface-exposed in the predicted secondary structure of the proteins.