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. 2015 Sep 15;3:e1126. doi: 10.7717/peerj.1126

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© 2015 Petkun et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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C and N termini are indicated (A). Cartoon representation, β-strands are numbered according to the alignment with Cel9G from C. cellulolyticum, and Cel9A from T. fusca. (B) Calcium-binding site of the CBM3c. (C) Birds-eye view of the flat surface. Residues are shaded according to their degree of conservation with C. cellulolyticum Cel9G and T. fusca CEL9A. Surface-exposed conserved residues are shown in stick representation. (D) Shallow groove of the CBM3c. Conserved surface residues are shown in stick representation. The residues are colored according to the degree of conservation in CBM3a, CBM3b and CBM3c modules derived from the sequences listed in the Methods section.