Copper association with iron sulfide magnetosomes in a magnetotactic bacterium |
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| Authors: | Dennis A. Bazylinski Anthony J. Garratt-Reed Afshin Abedi Richard B. Frankel |
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| Affiliation: | (1) Department of Anaerobic Microbiology, Virginia Polytechnic Institute and State University, 24061 Blacksburg, VA, USA;(2) Center for Materials Research, Massachusetts Institute of Technology, 02139 Cambridge, MA, USA;(3) Department of Physics, California Polytechnic State University, 93407 San Luis Obispo, CA, USA;(4) Department of Chemistry and Chemical Engineering, Stevens Institute of Technology, Castle Point on the Hudson, 07030 Hoboken, NJ, USA |
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| Abstract: | Greigite (Fe3S4) and pyrite (FeS2) particles in the magnetosomes of a many-celled, magnetotactic prokaryote (MMP), common in brackish-to-marine, sulfidic, aquatic habitats, contained relatively high concentrations of copper which ranged from about 0.1 to 10 atomic per cent relative to iron. In contrast, the greigite particles in the magnetosomes of a curved magnetotactic bacterium collected from the same sampling site did not contain significant levels of copper. The ability of the MMP to biomineralize copper within its magnetosomes appeared to be limited to that organism and dependent upon the site from which it was collected. Although the chemical mechanism and physiological function of copper accumulation in the magnetosomes of the MMP is unclear, the presence of copper is the first evidence that another transition metal ion could be incorporated in the mineral phase of the magnetosomes of a magnetotactic bacterium.Abbreviation MMP many-celled magnetotactic prokaryote |
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| Keywords: | Biomineralization Copper concentration Greigite Iron sulfide Magnetite Magnetosome Magnetotactic bacterium Pyrite Single magneticdomain |
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