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. 2022 Jun 30;12:11061. doi: 10.1038/s41598-022-15324-1

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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PG crosslinking in M. smegmatis. (a–c) Mass spectra of the monomer, dimer, and trimer from the digestion of cell wall peptidoglycan of mc2155 with the extracted ion chromatogram (XIC) as an inset (right). The schematic representation of the corresponding muropeptide fragments is shown as figure inset (left) and excludes any modification on the muropeptides except for the highlighted modification. (d) Profile of the muropeptide fragments as a function of the number of repeat units. Calculated PG crosslinking efficiency for mc2155 strain of M. smegmatis is 45.11 ± 0.79, and the average fragment size of the muropeptide is 1.82 ± 0.03 PG-repeat units. All error bar represents a 95% confidence interval (n = 3) for technical error. The composition is shown in Table S1. The chemical structure of the representative MS with various modifications is shown in Fig. S1.