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. 2022 Feb 15;12:822229. doi: 10.3389/fmicb.2021.822229

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Copyright © 2022 González-Rosales, Vergara, Dopson, Valdés and Holmes.

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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Unrooted phylogenetic tree of potassium transporters in Acidithiobacillia and their best hits in NCBI. (A) kup gene coding for Kup system had the highest similarity to homologs in extreme acidophiles Acidiferrobacter, Methylacidimicrobium, and Verrucomicrobium. (B) kch coding for Kch system had the highest similarity to Kch homologs in acidophiles Leptospirillum, Acidiphilium, Acidihalobacter, and Acidiferrobacter. Acidophilic sequences are highlighted in red. Filled circles at nodes represent bootstrap support of ≥60%. The scale bar represents amino acid substitution per site.