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Sökning: onr:"swepub:oai:gup.ub.gu.se/267205" > Conductive Particle...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004542naa a2200505 4500
001oai:gup.ub.gu.se/267205
003SwePub
008240528s2018 | |||||||||||000 ||eng|
0247 a https://gup.ub.gu.se/publication/2672052 URI
0247 a https://doi.org/10.1128/mBio.00226-182 DOI
040 a (SwePub)gu
041 a eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Rotaru, Amelia-Elena4 aut
2451 0a Conductive Particles Enable Syntrophic Acetate Oxidation between Geobacter and Methanosarcina from Coastal Sediments
264 1c 2018
520 a Coastal sediments are rich in conductive particles, possibly affecting microbial processes for which acetate is a central intermediate. In the methanogenic zone, acetate is consumed by methanogens and/or syntrophic acetate-oxidizing (SAO) consortia. SAO consortia live under extreme thermodynamic pressure, and their survival depends on successful partnership. Here, we demonstrate that conductive particles enable the partnership between SAO bacteria (i.e., Geobacter spp.) and methanogens (Methanosarcina spp.) from the coastal sediments of the Bothnian Bay of the Baltic Sea. Baltic methanogenic sediments were rich in conductive minerals, had an apparent isotopic fractionation characteristic of CO2-reductive methanogenesis, and were inhabited by Geobacter and Methanosarcina. As long as conductive particles were delivered, Geobacter and Methanosarcina persisted, whereas exclusion of conductive particles led to the extinction of Geobacter. Baltic Geobacter did not establish a direct electric contact with Methanosarcina, necessitating conductive particles as electrical conduits. Within SAO consortia, Geobacter was an efficient [13C]acetate utilizer, accounting for 82% of the assimilation and 27% of the breakdown of acetate. Geobacter benefits from the association with the methanogen, because in the absence of an electron acceptor it can use Methanosarcina as a terminal electron sink. Consequently, inhibition of methanogenesis constrained the SAO activity of Geobacter as well. A potential benefit for Methanosarcina partnering with Geobacter is that together they competitively exclude acetoclastic methanogens like Methanothrix from an environment rich in conductive particles. Conductive particle-mediated SAO could explain the abundance of acetate oxidizers like Geobacter in the methanogenic zone of sediments where no electron acceptors other than CO2 are available.IMPORTANCE Acetate-oxidizing bacteria are known to thrive in mutualistic consortia in which H2 or formate is shuttled to a methane-producing Archaea partner. Here, we discovered that such bacteria could instead transfer electrons via conductive minerals. Mineral SAO (syntrophic acetate oxidation) could be a vital pathway for CO2-reductive methanogenesis in the environment, especially in sediments rich in conductive minerals. Mineral-facilitated SAO is therefore of potential importance for both iron and methane cycles in sediments and soils. Additionally, our observations imply that agricultural runoff or amendments with conductive chars could trigger a significant increase in methane emissions.
650 7a NATURVETENSKAPx Biologi0 (SwePub)1062 hsv//swe
650 7a NATURAL SCIENCESx Biological Sciences0 (SwePub)1062 hsv//eng
650 7a NATURVETENSKAPx Kemi0 (SwePub)1042 hsv//swe
650 7a NATURAL SCIENCESx Chemical Sciences0 (SwePub)1042 hsv//eng
653 a Desulfuromonadales
653 a Geobacter
653 a Methanosarcina
653 a nanoSIMS
653 a activated carbon
653 a competitive exclusion
653 a direct interspecies electron transfer
653 a syntrophic acetate oxidation
7001 a Calabrese, Federica4 aut
7001 a Stryhanyuk, Hryhoriy4 aut
7001 a Musat, Florin4 aut
7001 a Shrestha, Pravin Malla4 aut
7001 a Weber, Hannah Sophia4 aut
7001 a Snoeyenbos-West, Oona L. O.4 aut
7001 a Hall, Per,d 1954u Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences4 aut0 (Swepub:gu)xhallp
7001 a Richnow, Hans H.4 aut
7001 a Musat, Niculina4 aut
7001 a Thamdrup, Bo4 aut
7102 a Göteborgs universitetb Institutionen för marina vetenskaper4 org
7730 t mBiog 9:3q 9:3x 2150-7511
8564 8u https://gup.ub.gu.se/publication/267205
8564 8u https://doi.org/10.1128/mBio.00226-18

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