Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool
Homoacetogens are efficient CO2 fixing bacteria using H2 as electron donor to produce acetate. These organisms can be enriched at the biocathode of microbial electrosynthesis (MES) for electricity-driven CO2 reduction to acetate. Studies exploring homoacetogens in MES are mainly conducted using pure...
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Frontiers Media S.A.
2019-11-01
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Online Access: | https://www.frontiersin.org/article/10.3389/fmicb.2019.02563/full |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Manal F. Alqahtani Suman Bajracharya Krishna P. Katuri Muhammad Ali Ala’a Ragab Grégoire Michoud Daniele Daffonchio Pascal E. Saikaly |
spellingShingle |
Manal F. Alqahtani Suman Bajracharya Krishna P. Katuri Muhammad Ali Ala’a Ragab Grégoire Michoud Daniele Daffonchio Pascal E. Saikaly Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool Frontiers in Microbiology Red Sea brine pool microbial electrosynthesis metagenome-assembled genome marinobacter halophilic homoacetogens |
author_facet |
Manal F. Alqahtani Suman Bajracharya Krishna P. Katuri Muhammad Ali Ala’a Ragab Grégoire Michoud Daniele Daffonchio Pascal E. Saikaly |
author_sort |
Manal F. Alqahtani |
title |
Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool |
title_short |
Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool |
title_full |
Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool |
title_fullStr |
Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool |
title_full_unstemmed |
Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine Pool |
title_sort |
enrichment of marinobacter sp. and halophilic homoacetogens at the biocathode of microbial electrosynthesis system inoculated with red sea brine pool |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Microbiology |
issn |
1664-302X |
publishDate |
2019-11-01 |
description |
Homoacetogens are efficient CO2 fixing bacteria using H2 as electron donor to produce acetate. These organisms can be enriched at the biocathode of microbial electrosynthesis (MES) for electricity-driven CO2 reduction to acetate. Studies exploring homoacetogens in MES are mainly conducted using pure or mix-culture anaerobic inocula from samples with standard environmental conditions. Extreme marine environments host unique microbial communities including homoacetogens that may have unique capabilities due to their adaptation to harsh environmental conditions. Anaerobic deep-sea brine pools are hypersaline and metalliferous environments and homoacetogens can be expected to live in these environments due to their remarkable metabolic flexibility and energy-efficient biosynthesis. However, brine pools have never been explored as inocula for the enrichment of homacetogens in MES. Here we used the saline water from a Red Sea brine pool as inoculum for the enrichment of halophilic homoacetogens at the biocathode (−1 V vs. Ag/AgCl) of MES. Volatile fatty acids, especially acetate, along with hydrogen gas were produced in MES systems operated at 25 and 10% salinity. Acetate concentration increased when MES was operated at a lower salinity ∼3.5%, representing typical seawater salinity. Amplicon sequencing and genome-centric metagenomics of matured cathodic biofilm showed dominance of the genus Marinobacter and phylum Firmicutes at all tested salinities. Seventeen high-quality draft metagenome-assembled genomes (MAGs) were extracted from the biocathode samples. The recovered MAGs accounted for 87 ± 4% of the quality filtered sequence reads. Genome analysis of the MAGs suggested CO2 fixation via Wood–Ljundahl pathway by members of the phylum Firmicutes and the fixed CO2 was possibly utilized by Marinobacter sp. for growth by consuming O2 escaping from the anode to the cathode for respiration. The enrichment of Marinobacter sp. with homoacetogens was only possible because of the specific cathodic environment in MES. These findings suggest that in organic carbon-limited saline environments, Marinobacter spp. can live in consortia with CO2 fixing bacteria such as homoacetogens, which can provide them with fixed carbon as a source of carbon and energy. |
topic |
Red Sea brine pool microbial electrosynthesis metagenome-assembled genome marinobacter halophilic homoacetogens |
url |
https://www.frontiersin.org/article/10.3389/fmicb.2019.02563/full |
work_keys_str_mv |
AT manalfalqahtani enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool AT sumanbajracharya enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool AT krishnapkaturi enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool AT muhammadali enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool AT alaaragab enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool AT gregoiremichoud enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool AT danieledaffonchio enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool AT pascalesaikaly enrichmentofmarinobacterspandhalophilichomoacetogensatthebiocathodeofmicrobialelectrosynthesissysteminoculatedwithredseabrinepool |
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1724947703147790336 |
spelling |
doaj-c2661e080dbc40f4b28c056739a5627e2020-11-25T02:03:30ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2019-11-011010.3389/fmicb.2019.02563486066Enrichment of Marinobacter sp. and Halophilic Homoacetogens at the Biocathode of Microbial Electrosynthesis System Inoculated With Red Sea Brine PoolManal F. Alqahtani0Suman Bajracharya1Krishna P. Katuri2Muhammad Ali3Ala’a Ragab4Grégoire Michoud5Daniele Daffonchio6Pascal E. Saikaly7King Abdullah University of Science and Technology, Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaKing Abdullah University of Science and Technology, Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaKing Abdullah University of Science and Technology, Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaKing Abdullah University of Science and Technology, Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaKing Abdullah University of Science and Technology, Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaKing Abdullah University of Science and Technology, Red Sea Research Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaKing Abdullah University of Science and Technology, Red Sea Research Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaKing Abdullah University of Science and Technology, Water Desalination and Reuse Center, Biological and Environmental Science and Engineering Division, Thuwal, Saudi ArabiaHomoacetogens are efficient CO2 fixing bacteria using H2 as electron donor to produce acetate. These organisms can be enriched at the biocathode of microbial electrosynthesis (MES) for electricity-driven CO2 reduction to acetate. Studies exploring homoacetogens in MES are mainly conducted using pure or mix-culture anaerobic inocula from samples with standard environmental conditions. Extreme marine environments host unique microbial communities including homoacetogens that may have unique capabilities due to their adaptation to harsh environmental conditions. Anaerobic deep-sea brine pools are hypersaline and metalliferous environments and homoacetogens can be expected to live in these environments due to their remarkable metabolic flexibility and energy-efficient biosynthesis. However, brine pools have never been explored as inocula for the enrichment of homacetogens in MES. Here we used the saline water from a Red Sea brine pool as inoculum for the enrichment of halophilic homoacetogens at the biocathode (−1 V vs. Ag/AgCl) of MES. Volatile fatty acids, especially acetate, along with hydrogen gas were produced in MES systems operated at 25 and 10% salinity. Acetate concentration increased when MES was operated at a lower salinity ∼3.5%, representing typical seawater salinity. Amplicon sequencing and genome-centric metagenomics of matured cathodic biofilm showed dominance of the genus Marinobacter and phylum Firmicutes at all tested salinities. Seventeen high-quality draft metagenome-assembled genomes (MAGs) were extracted from the biocathode samples. The recovered MAGs accounted for 87 ± 4% of the quality filtered sequence reads. Genome analysis of the MAGs suggested CO2 fixation via Wood–Ljundahl pathway by members of the phylum Firmicutes and the fixed CO2 was possibly utilized by Marinobacter sp. for growth by consuming O2 escaping from the anode to the cathode for respiration. The enrichment of Marinobacter sp. with homoacetogens was only possible because of the specific cathodic environment in MES. These findings suggest that in organic carbon-limited saline environments, Marinobacter spp. can live in consortia with CO2 fixing bacteria such as homoacetogens, which can provide them with fixed carbon as a source of carbon and energy.https://www.frontiersin.org/article/10.3389/fmicb.2019.02563/fullRed Sea brine poolmicrobial electrosynthesismetagenome-assembled genomemarinobacterhalophilic homoacetogens |