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. 2020 Aug 13;10:13775. doi: 10.1038/s41598-020-70749-w

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© The Author(s) 2020

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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Proposed model of the ChiUL. FjCusD_I (PDB accession 5j90), FjCusD_II (PDB accession 5j5u), and FjChiB are outer membrane-bound lipoproteins where the former two bind oligosaccharides and facilitate import into the periplasm and the latter is an endo-acting chitinase. FjGH20 is a periplasmic chitobiase that cleaves imported oligosaccharides into GlcNAc for further metabolism. A modelled structure of ChiA based on homology models of the terminal GH18 chitinases, FjChiA_N and FjChiA_C, and spanned by homology models of the Fn3- and Ig-like domains of FjChiA_M fitted into the modelled SAXS envelope is visualized bound to, and possibly exfoliating, polysaccharides from insoluble chitin crystals.