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. 2019 Dec 5;10:2717. doi: 10.3389/fmicb.2019.02717

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Copyright © 2019 Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Structure and substrate binding of keratinases. (A) Crystal structure of rMtaKer. The structure of rMtaKer (PDB id 5WSL) is shown. The metal ions are shown as spheres. (B) Surface charge representation of rMtaKer. The substrate binding to the active site are shown as sticks. (C) The residues critical for disulfide bond formation are shown. (D) Crystals structure of other keratinase. The crystal structure of a bacterial keratinase (PDB id 1CSE) is shown. No cysteine residue is present in this enzyme.