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dc.contributor.authorFox-Powell, Mark G.
dc.contributor.authorCockell, Charles S.
dc.identifier.citationFox-Powell , M G & Cockell , C S 2018 , ' Building a geochemical view of microbial salt tolerance : halophilic adaptation of Marinococcus in a natural magnesium sulfate brine ' , Frontiers in Microbiology , vol. 9 , 739 .
dc.identifier.otherPURE: 252839082
dc.identifier.otherPURE UUID: 4c3c0ee2-d5bb-4b1e-a8d6-900d4e48ecf3
dc.identifier.otherBibtex: urn:d2ca42eae92f6d387382688b0a88f3df
dc.identifier.otherScopus: 85045741015
dc.identifier.otherWOS: 000430095800002
dc.descriptionThis study was conducted with support from the Science and Technology Facilities Council (STFC), grant no. ST/M001261/1.en
dc.description.abstractCurrent knowledge of life in hypersaline habitats is mostly limited to sodium and chloride-dominated environments. This narrow compositional window does not reflect the diversity of brine environments that exist naturally on Earth and other planetary bodies. Understanding the limits of the microbial biosphere and predicting extraterrestrial habitability demands a systematic effort to characterize ionic specificities of organisms from a representative range of saline habitats. Here, we investigated a strain of Marinococcus isolated from the magnesium and sulfate-dominated Basque Lakes (British Columbia, Canada). This organism was the sole isolate obtained after exposure to exceptionally high levels of Mg2+ and SO42- ions (2.369 and 2.840 M, respectively), and grew at extremes of ionic strength not normally encountered in Na+/Cl- brines (12.141 mol liter-1). Its association at the 16S rDNA level with bacterial halophiles suggests that ancestral halophily has allowed it to adapt to a different saline habitat. Growth was demonstrated in media dominated by NaCl, Na2SO4, MgCl2, and MgSO4, yet despite this plasticity the strain was still restricted; requiring either Na+ or Cl- to maintain short doubling times. Water activity could not explain growth rate differences between media, demonstrating the importance of ionic composition for dictating microbial growth windows. A new framework for understanding growth in brines is required, that accounts for the geochemical history of brines as well as the various stresses that ions impose on microbes. Studies such as this are required to gain a truly universal understanding of the limits of biological ion tolerance.
dc.relation.ispartofFrontiers in Microbiologyen
dc.rightsCopyright © 2018 Fox-Powell and Cockell. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.subjectMagnesium sulphateen
dc.subjectGE Environmental Sciencesen
dc.subjectQE Geologyen
dc.subjectQD Chemistryen
dc.subjectQR Microbiologyen
dc.titleBuilding a geochemical view of microbial salt tolerance : halophilic adaptation of Marinococcus in a natural magnesium sulfate brineen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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