A Cultured Greigite-Producing Magnetotactic Bacterium in a Novel Group of Sulfate-Reducing BacteriaScience Magazine
AbstractMagnetotactic bacteria contain magnetosomes—intracellular, membrane-bounded, magnetic nanocrystals of magnetite (Fe3O4) or greigite (Fe3S4)—that cause the bacteria to swim along geomagnetic field lines. We isolated a greigite-producing magnetotactic bacterium from a brackish spring in Death Valley National Park, California, USA, strain BW-1, that is able to biomineralize greigite and magnetite depending on culture conditions. A phylogenetic comparison of BW-1 and similar uncultured greigite- and/or magnetite-producing magnetotactic bacteria from freshwater to hypersaline habitats shows that these organisms represent a previously unknown group of sulfate-reducing bacteria in the Deltaproteobacteria. Genomic analysis of BW-1 reveals the presence of two different magnetosome gene clusters, suggesting that one may be responsible for greigite biomineralization and the other for magnetite.
Copyright2011 American Association for the Advancement of Science.
Citation InformationChristopher T. Lefèvre, Nicholas Menguy, Fernanda Abreu, Ulysses Lins, et al.. "A Cultured Greigite-Producing Magnetotactic Bacterium in a Novel Group of Sulfate-Reducing Bacteria" Science Magazine Vol. 334 Iss. 6063 (2011) p. 1720 - 1723
Available at: http://works.bepress.com/rfrankel/183/