期刊
SCIENCE
卷 334, 期 6063, 页码 1720-1723出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1212596
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资金
- U.S. National Science Foundation [EAR-0920718]
- Fondation pour la Recherche Medicale [SPF20101220993]
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- U.S. Department of Energy by Iowa State University [DE-AC02-07CH11358]
- Directorate For Geosciences
- Division Of Earth Sciences [0920718] Funding Source: National Science Foundation
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.
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