Anoxygenic Photosynthesis Controls Oxygenic Photosynthesis in a Cyanobacterium from a Sulfidic Spring

Handle URI:
http://hdl.handle.net/10754/346970
Title:
Anoxygenic Photosynthesis Controls Oxygenic Photosynthesis in a Cyanobacterium from a Sulfidic Spring
Authors:
Klatt, Judith M.; Alnajjar, Mohammad Ahmad ( 0000-0003-4861-1604 ) ; Yilmaz, Pelin; Lavik, Gaute; de Beer, Dirk; Polerecky, Lubos
Abstract:
Before the Earth's complete oxygenation (0.58 to 0.55 billion years [Ga] ago), the photic zone of the Proterozoic oceans was probably redox stratified, with a slightly aerobic, nutrient-limited upper layer above a light-limited layer that tended toward euxinia. In such oceans, cyanobacteria capable of both oxygenic and sulfide-driven anoxygenic photosynthesis played a fundamental role in the global carbon, oxygen, and sulfur cycle. We have isolated a cyanobacterium, Pseudanabaena strain FS39, in which this versatility is still conserved, and we show that the transition between the two photosynthetic modes follows a surprisingly simple kinetic regulation controlled by this organism's affinity for H2S. Specifically, oxygenic photosynthesis is performed in addition to anoxygenic photosynthesis only when H2S becomes limiting and its concentration decreases below a threshold that increases predictably with the available ambient light. The carbon-based growth rates during oxygenic and anoxygenic photosynthesis were similar. However, Pseudanabaena FS39 additionally assimilated NO3 - during anoxygenic photosynthesis. Thus, the transition between anoxygenic and oxygenic photosynthesis was accompanied by a shift of the C/N ratio of the total bulk biomass. These mechanisms offer new insights into the way in which, despite nutrient limitation in the oxic photic zone in the mid-Proterozoic oceans, versatile cyanobacteria might have promoted oxygenic photosynthesis and total primary productivity, a key step that enabled the complete oxygenation of our planet and the subsequent diversification of life.
KAUST Department:
Red Sea Research Center (RSRC)
Citation:
Anoxygenic Photosynthesis Controls Oxygenic Photosynthesis in a Cyanobacterium from a Sulfidic Spring 2015, 81 (6):2025 Applied and Environmental Microbiology
Publisher:
American Society for Microbiology
Journal:
Applied and Environmental Microbiology
Issue Date:
15-Mar-2015
DOI:
10.1128/AEM.03579-14
PubMed ID:
25576611
PubMed Central ID:
PMC4345360
Type:
Article
ISSN:
0099-2240; 1098-5336
Additional Links:
http://aem.asm.org/lookup/doi/10.1128/AEM.03579-14
Appears in Collections:
Articles; Red Sea Research Center (RSRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorKlatt, Judith M.en
dc.contributor.authorAlnajjar, Mohammad Ahmaden
dc.contributor.authorYilmaz, Pelinen
dc.contributor.authorLavik, Gauteen
dc.contributor.authorde Beer, Dirken
dc.contributor.authorPolerecky, Lubosen
dc.date.accessioned2015-03-23T08:11:21Zen
dc.date.available2015-03-23T08:11:21Zen
dc.date.issued2015-03-15en
dc.identifier.citationAnoxygenic Photosynthesis Controls Oxygenic Photosynthesis in a Cyanobacterium from a Sulfidic Spring 2015, 81 (6):2025 Applied and Environmental Microbiologyen
dc.identifier.issn0099-2240en
dc.identifier.issn1098-5336en
dc.identifier.pmid25576611en
dc.identifier.doi10.1128/AEM.03579-14en
dc.identifier.urihttp://hdl.handle.net/10754/346970en
dc.description.abstractBefore the Earth's complete oxygenation (0.58 to 0.55 billion years [Ga] ago), the photic zone of the Proterozoic oceans was probably redox stratified, with a slightly aerobic, nutrient-limited upper layer above a light-limited layer that tended toward euxinia. In such oceans, cyanobacteria capable of both oxygenic and sulfide-driven anoxygenic photosynthesis played a fundamental role in the global carbon, oxygen, and sulfur cycle. We have isolated a cyanobacterium, Pseudanabaena strain FS39, in which this versatility is still conserved, and we show that the transition between the two photosynthetic modes follows a surprisingly simple kinetic regulation controlled by this organism's affinity for H2S. Specifically, oxygenic photosynthesis is performed in addition to anoxygenic photosynthesis only when H2S becomes limiting and its concentration decreases below a threshold that increases predictably with the available ambient light. The carbon-based growth rates during oxygenic and anoxygenic photosynthesis were similar. However, Pseudanabaena FS39 additionally assimilated NO3 - during anoxygenic photosynthesis. Thus, the transition between anoxygenic and oxygenic photosynthesis was accompanied by a shift of the C/N ratio of the total bulk biomass. These mechanisms offer new insights into the way in which, despite nutrient limitation in the oxic photic zone in the mid-Proterozoic oceans, versatile cyanobacteria might have promoted oxygenic photosynthesis and total primary productivity, a key step that enabled the complete oxygenation of our planet and the subsequent diversification of life.en
dc.publisherAmerican Society for Microbiologyen
dc.relation.urlhttp://aem.asm.org/lookup/doi/10.1128/AEM.03579-14en
dc.rightsCopyright © 2015, American Society for Microbiology. All Rights Reserved.en
dc.titleAnoxygenic Photosynthesis Controls Oxygenic Photosynthesis in a Cyanobacterium from a Sulfidic Springen
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.identifier.journalApplied and Environmental Microbiologyen
dc.identifier.pmcidPMC4345360en
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionMax Planck Institute for Marine Microbiology, Bremen, Germanyen
dc.contributor.institutionDepartment of Earth Sciences—Geochemistry, Faculty of Geosciences, Utrecht University, Utrecht, The Netherlandsen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorAlnajjar, Mohammad Ahmaden

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