A Cultured Greigite-Producing Magnetotactic Bacterium in a Novel Group of Sulfate-Reducing Bacteria

作者：Lefevre Christopher T; Menguy Nicolas; Abreu Fernanda; Lins Ulysses; Posfai Mihaly; Prozorov Tanya; Pignol David; Frankel Richard B; Bazylinski Dennis A^*

来源：Science, 2011, 334(6063): 1720-1723.

DOI：10.1126/science.1212596

Magnetotactic 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.

• 出版日期2011-12-23