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. 2015 Sep 16;6:989. doi: 10.3389/fmicb.2015.00989

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Copyright © 2015 Han and Perner.

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) or licensor 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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Phylogenetic relationships of SQR sequences to those from Sulfurimonas species. The sequences of SQRs were compared with the non-redundant protein database of NCBI by using BLASTP. The phylogenetic tree was constructed with MEGA6 (Tamura et al., 2013) based on the Maximum-likelihood method with 1000 bootstrap replications after multiple alignments with ClustalW (Larkin et al., 2007). The percentage of bootstrap resamplings ≥70 is indicated on the branches. The scale bar represents the expected number of changes per amino acids position. The types of SQRs are classified according to Marcia et al. (2010). Isolation sources of Sulfurimonas species are indicated in different colors: blue, marine non-vent water system; purple, marine sediments; red, hydrothermal environments. The proteins which has a TAT motif at N-terminus are marked with ‘^∗’.