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. 2018 Aug 3;9:1759. doi: 10.3389/fmicb.2018.01759

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Copyright © 2018 Toshchakov, Lebedinsky, Sokolova, Zavarzina, Korzhenkov, Teplyuk, Chistyakova, Rusakov, Bonch-Osmolovskaya, Kublanov and Gavrilov.

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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Gene clusters determining hydrogenogenic carboxydotrophy in Carboxydothermus hydrogenoformans and Carboxydocella thermautotrophica strains 41^T and 019. cooA: gene of redox- and CO-sensitive transcriptional regulator; cooS (red horizontal arrow): [Ni,Fe]-CODH gene; cooC: gene of [Ni,Fe]-CODH accessory nickel-insertion protein; cooMKLXUH: genes of energy-converting hydrogenase (ECH); hypA: gene of hydrogenase maturation protein; cooF: gene of ferredoxin-like protein; cooH (blue horizontal arrow): gene of ECH catalytic subunit. Red vertical arrows show locations of CooA-binding sites. The locus tags for the gene clusters are CHY_1835-1824, CTH_0165-0177, and CFE_0162-0174. Note that the exact role of the upstream ‘enigmatic’ cooSC operon (CTH_0166-167 and CFE_0163-0164) in carboxydocellas remains unclear (refer to the text for details).