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. 2022 Sep 19;13:5485. doi: 10.1038/s41467-022-32993-8

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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 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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Fig. 3 — a Domain-1 of the apo1 structure oriented to look down the double-psi β-barrel (DPBB) structural motif. The strands making up the DPBB are highlighted in bright green. b Topology diagram of Domain-1 highlighting the fold of the DPBB motif (bright green). c The two psi motifs (green and cyan) from the V-Csn apo1 structure, shown in approximately the same orientation so that their structural similarity is evident. d The two psi motifs in the context of the V-Csn apo1 structure. The green psi motif is in approximately the same orientation as in c and the cyan psi motif is rotated about 180° about an axis into the page. Together they make up the double-psi β-barrel (DPBB) structural motif. e Superposition of V-Csn Domain-1 (light green) and kiwellin from Actinidia chinensis (PDB code 4PMK; orange ribbon). Loop1 and Loop2 in kiwellin coincide approximately with parts of Domain-2 (pink ribbon) of V-Csn. f Superposition of V-Csn Domain-1 (light green) and endoglucanase V from Humicola insolens (PDB code 4ENG; yellow ribbon). Loops 1 and 2 in endoglucanase V correspond approximately with Domain-2 (pink ribbon) of V-Csn. g Superposition of V-Csn Domain-1 (light green) and expansin from Clavibacter michiganensis (PDB code 4JCW; light purple ribbon). Loop1 of the expansin corresponds to part of V-Csn Domain-2 (pink ribbon), however, the C-terminal domain of the expansin (C-domain) bears no structural similarity to V-Csn.