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. 2019 Aug 9;19:59. doi: 10.1186/s12896-019-0553-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Substrate recognition and calcium ion binding interaction sites. (a) The substrate is shown as sticks in gray. Residues from template and Ph-HepI are shown in green and magenta, respectively. (b) The calcium ion is shown as a yellow sphere. Residues from template and Ph-HepI are shown in green and magenta, respectively. (c) Cartoon representation of the structure model of Ph-HepI. The two residues (Ser169 and Ala259) in the Ph-HepI are indicated by markers in green and magenta, respectively. Two amino acids in Ph-HepI are different from template (Ser169, Ala259)