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. 2020 Jun 8;20:149. doi: 10.1186/s12866-020-01835-2

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 7 — Overview of major (trans) hydrogenase reactions involving ferredoxin in P. thermosuccinogenes. Arrow represent the flow of electrons. PFOR: pyruvate:ferredoxin oxidoreductase; Flx-Hdr: NADH dehydrogenase/heterodisulfide reductase bifurcation complex; NFN: NADH-dependent reduced ferredoxin: NADP⁺ oxidoreductase; RNF: ion-translocating reduced ferredoxin: NAD⁺ oxidoreductase; ECH: energy-converting [NiFe] hydrogenase; Hyd: hydrogenase; bif-Hyd: bifurcating hydrogenase. Differential expression of the corresponding genes (and their locus tags) are presented in Fig. 5. It is not entirely clear what hydrogenases are present besides ECH. The presence of several genes potentially encoding hydrogenases, and of [FeFe] hydrogenase maturation factors does suggest P. thermosuccinogenes possesses additional hydrogenases