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Article

Metabolic Capacity of the Antarctic Cyanobacterium Phormidium pseudopriestleyi That Sustains Oxygenic Photosynthesis in the Presence of Hydrogen Sulfide

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Microbiology Graduate Group, University of California, Davis, CA 95616, USA
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Life Sciences Department, The Natural History Museum, London SW7 5BD, UK
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Genomics and Bioinformatics, Novozymes, Inc., Davis, CA 95616, USA
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Coastal Marine Field Station, University of Waikato, Tauranga 3110, New Zealand
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Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA
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Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, USA
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Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA
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Department of Earth and Planetary Sciences, University of California, Davis, CA 95616, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Ilka Axmann, Denis Baurain and Luc Cornet
Genes 2021, 12(3), 426; https://doi.org/10.3390/genes12030426
Received: 18 January 2021 / Revised: 5 March 2021 / Accepted: 12 March 2021 / Published: 16 March 2021
Sulfide inhibits oxygenic photosynthesis by blocking electron transfer between H2O and the oxygen-evolving complex in the D1 protein of Photosystem II. The ability of cyanobacteria to counter this effect has implications for understanding the productivity of benthic microbial mats in sulfidic environments throughout Earth history. In Lake Fryxell, Antarctica, the benthic, filamentous cyanobacterium Phormidium pseudopriestleyi creates a 1–2 mm thick layer of 50 µmol L−1 O2 in otherwise sulfidic water, demonstrating that it sustains oxygenic photosynthesis in the presence of sulfide. A metagenome-assembled genome of P. pseudopriestleyi indicates a genetic capacity for oxygenic photosynthesis, including multiple copies of psbA (encoding the D1 protein of Photosystem II), and anoxygenic photosynthesis with a copy of sqr (encoding the sulfide quinone reductase protein that oxidizes sulfide). The genomic content of P. pseudopriestleyi is consistent with sulfide tolerance mechanisms including increasing psbA expression or directly oxidizing sulfide with sulfide quinone reductase. However, the ability of the organism to reduce Photosystem I via sulfide quinone reductase while Photosystem II is sulfide-inhibited, thereby performing anoxygenic photosynthesis in the presence of sulfide, has yet to be demonstrated. View Full-Text
Keywords: cyanobacteria; cryosphere; genomics; sulfide; photosynthesis; lake; Antarctica cyanobacteria; cryosphere; genomics; sulfide; photosynthesis; lake; Antarctica
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MDPI and ACS Style

Lumian, J.E.; Jungblut, A.D.; Dillion, M.L.; Hawes, I.; Doran, P.T.; Mackey, T.J.; Dick, G.J.; Grettenberger, C.L.; Sumner, D.Y. Metabolic Capacity of the Antarctic Cyanobacterium Phormidium pseudopriestleyi That Sustains Oxygenic Photosynthesis in the Presence of Hydrogen Sulfide. Genes 2021, 12, 426. https://doi.org/10.3390/genes12030426

AMA Style

Lumian JE, Jungblut AD, Dillion ML, Hawes I, Doran PT, Mackey TJ, Dick GJ, Grettenberger CL, Sumner DY. Metabolic Capacity of the Antarctic Cyanobacterium Phormidium pseudopriestleyi That Sustains Oxygenic Photosynthesis in the Presence of Hydrogen Sulfide. Genes. 2021; 12(3):426. https://doi.org/10.3390/genes12030426

Chicago/Turabian Style

Lumian, Jessica E., Anne D. Jungblut, Megan L. Dillion, Ian Hawes, Peter T. Doran, Tyler J. Mackey, Gregory J. Dick, Christen L. Grettenberger, and Dawn Y. Sumner 2021. "Metabolic Capacity of the Antarctic Cyanobacterium Phormidium pseudopriestleyi That Sustains Oxygenic Photosynthesis in the Presence of Hydrogen Sulfide" Genes 12, no. 3: 426. https://doi.org/10.3390/genes12030426

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