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. 2019 Mar 5;10:384. doi: 10.3389/fmicb.2019.00384

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Copyright © 2019 Luedin, Storelli, Danza, Roman, Wittwer, Pothier and Tonolla.

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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Schematic overview of carbon fixation and energy metabolism of “Thiodictyon syntrophicum” strain Cad16^T during day and night under micro oxic conditions in the Lake Cadagno chemocline. (A) During the day cyanobacteria spp. locally produce oxygen that potentially is used by PSB strain Cad16^T for respiration. In parallel, strain Cad16^T is actively oxidizing sulfide and fixing inorganic carbon in anoxygenic photosynthesis. (B) At night, low levels of oxygen remain in the chemocline and are used as electron acceptor in substrate respiration in strain Cad16^T. The RuBisCO form II is possibly active in maintain the redox balance using CO₂ as an electron acceptor. C_org, organic carbon; Cya, cyanobacteria; GAPDH, glyceraldehyde−3-dehydrogenase; PSB, purple sulfur bacteria; RuBisCO, ribulose−1,5-bisphosphate carboxylase/oxygenase. Dotted arrows, diffusive processes; Yellow arrows, oxygenic photosynthesis; red arrows, anoxygenic photosynthesis; black arrows, chemotrophic reactions.