Light-dependent electrogenic activity of cyanobacteria.

<h4>Background</h4>Cyanobacteria account for 20-30% of Earth's primary photosynthetic productivity and convert solar energy into biomass-stored chemical energy at the rate of approximately 450 TW [1]. These single-cell microorganisms are resilient predecessors of all higher oxygenic...

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Autores principales:	John M Pisciotta, Yongjin Zou, Ilia V Baskakov
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2010
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5c67babe29f5490997b964eadb958541
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spelling	oai:doaj.org-article:5c67babe29f5490997b964eadb9585412021-12-02T20:21:24ZLight-dependent electrogenic activity of cyanobacteria.1932-620310.1371/journal.pone.0010821https://doaj.org/article/5c67babe29f5490997b964eadb9585412010-05-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/20520829/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Cyanobacteria account for 20-30% of Earth's primary photosynthetic productivity and convert solar energy into biomass-stored chemical energy at the rate of approximately 450 TW [1]. These single-cell microorganisms are resilient predecessors of all higher oxygenic phototrophs and can be found in self-sustaining, nitrogen-fixing communities the world over, from Antarctic glaciers to the Sahara desert [2].<h4>Methodology/principal findings</h4>Here we show that diverse genera of cyanobacteria including biofilm-forming and pelagic strains have a conserved light-dependent electrogenic activity, i.e. the ability to transfer electrons to their surroundings in response to illumination. Naturally-growing biofilm-forming photosynthetic consortia also displayed light-dependent electrogenic activity, demonstrating that this phenomenon is not limited to individual cultures. Treatment with site-specific inhibitors revealed the electrons originate at the photosynthetic electron transfer chain (P-ETC). Moreover, electrogenic activity was observed upon illumination only with blue or red but not green light confirming that P-ETC is the source of electrons. The yield of electrons harvested by extracellular electron acceptor to photons available for photosynthesis ranged from 0.05% to 0.3%, although the efficiency of electron harvesting likely varies depending on terminal electron acceptor.<h4>Conclusions/significance</h4>The current study illustrates that cyanobacterial electrogenic activity is an important microbiological conduit of solar energy into the biosphere. The mechanism responsible for electrogenic activity in cyanobacteria appears to be fundamentally different from the one exploited in previously discovered electrogenic bacteria, such as Geobacter, where electrons are derived from oxidation of organic compounds and transported via a respiratory electron transfer chain (R-ETC) [3], [4]. The electrogenic pathway of cyanobacteria might be exploited to develop light-sensitive devices or future technologies that convert solar energy into limited amounts of electricity in a self-sustainable, CO(2)-free manner.John M PisciottaYongjin ZouIlia V BaskakovPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 5, Iss 5, p e10821 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q John M Pisciotta Yongjin Zou Ilia V Baskakov Light-dependent electrogenic activity of cyanobacteria.
description	<h4>Background</h4>Cyanobacteria account for 20-30% of Earth's primary photosynthetic productivity and convert solar energy into biomass-stored chemical energy at the rate of approximately 450 TW [1]. These single-cell microorganisms are resilient predecessors of all higher oxygenic phototrophs and can be found in self-sustaining, nitrogen-fixing communities the world over, from Antarctic glaciers to the Sahara desert [2].<h4>Methodology/principal findings</h4>Here we show that diverse genera of cyanobacteria including biofilm-forming and pelagic strains have a conserved light-dependent electrogenic activity, i.e. the ability to transfer electrons to their surroundings in response to illumination. Naturally-growing biofilm-forming photosynthetic consortia also displayed light-dependent electrogenic activity, demonstrating that this phenomenon is not limited to individual cultures. Treatment with site-specific inhibitors revealed the electrons originate at the photosynthetic electron transfer chain (P-ETC). Moreover, electrogenic activity was observed upon illumination only with blue or red but not green light confirming that P-ETC is the source of electrons. The yield of electrons harvested by extracellular electron acceptor to photons available for photosynthesis ranged from 0.05% to 0.3%, although the efficiency of electron harvesting likely varies depending on terminal electron acceptor.<h4>Conclusions/significance</h4>The current study illustrates that cyanobacterial electrogenic activity is an important microbiological conduit of solar energy into the biosphere. The mechanism responsible for electrogenic activity in cyanobacteria appears to be fundamentally different from the one exploited in previously discovered electrogenic bacteria, such as Geobacter, where electrons are derived from oxidation of organic compounds and transported via a respiratory electron transfer chain (R-ETC) [3], [4]. The electrogenic pathway of cyanobacteria might be exploited to develop light-sensitive devices or future technologies that convert solar energy into limited amounts of electricity in a self-sustainable, CO(2)-free manner.
format	article
author	John M Pisciotta Yongjin Zou Ilia V Baskakov
author_facet	John M Pisciotta Yongjin Zou Ilia V Baskakov
author_sort	John M Pisciotta
title	Light-dependent electrogenic activity of cyanobacteria.
title_short	Light-dependent electrogenic activity of cyanobacteria.
title_full	Light-dependent electrogenic activity of cyanobacteria.
title_fullStr	Light-dependent electrogenic activity of cyanobacteria.
title_full_unstemmed	Light-dependent electrogenic activity of cyanobacteria.
title_sort	light-dependent electrogenic activity of cyanobacteria.
publisher	Public Library of Science (PLoS)
publishDate	2010
url	https://doaj.org/article/5c67babe29f5490997b964eadb958541
work_keys_str_mv	AT johnmpisciotta lightdependentelectrogenicactivityofcyanobacteria AT yongjinzou lightdependentelectrogenicactivityofcyanobacteria AT iliavbaskakov lightdependentelectrogenicactivityofcyanobacteria
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Light-dependent electrogenic activity of cyanobacteria.

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