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. 2016 Dec 9;11(4):945–958. doi: 10.1038/ismej.2016.171

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Copyright © 2017 International Society for Microbial Ecology

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The uptake hydrogenase gene-based phylogenetic tree of more than 130 bacterial species showing both thermophilic and mesophilic strains contain a hydrogenase encoded by the genes hupS (small subunit) and hupL (large subunit). In addition, a second hydrogenase encoded by the genes hhyS (small subunit) and hhyL (large subunit) were identified only in the thermophilic strain SolV and the close relative strain Kam1. The evolutionary history was generated using the neighbour-joining method. The percentage of replicate trees in which the associated taxa clustered in the bootstrap test is shown next to the branches. The analysis involved 136 nucleotide sequences. Evolutionary analyses were conducted in MEGA6. (*) indicates four exceptions including Thiorhodococcus drewsii AZ1, Thiocapsa marina, Salmonella enterica and Methylocystis parvus, which fit to Group 1e and 1c, in addition to Group 1d hydrogenases.