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. 2019 May 31;10:1214. doi: 10.3389/fmicb.2019.01214

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Copyright © 2019 Huang, Mayaka, Zhong, Zhang, Hou, Ni and Shen.

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 modeling of Hjc, S34A, and S34E. The structural model were built using the online server SWISS-MODEL (https://swissmodel.expasy.org/) based on the S. solfataricus Hjc structure (PDB: 1HH1) and analyzed by PyMOL. The three structures (dimer) are aligned together in which wild type (S34), S34A, and S34E are in blue, pink, and green colors, respectively. The circular dotted line indicates the catalytic center consisting of four highly conserved residues, E12, D42, E55, and K57. A five-amino acid loop containing the mutated residue is shown as sticks. The distances between the 34th amino acid to the closest catalytic residue D42 are D42-S34∼9.9Å, D42-A34∼5.4Å, and D42-E34∼4.7Å, respectively.