Intracellular iron minerals in a dissimilatory iron-reducing bacterium.
Among prokaryotes, there are few examples of controlled mineral formation; the formation of crystalline iron oxides and sulfides [magnetite (Fe3O4) or greigite (Fe3S4)] by magnetotactic bacteria is an exception. Shewanella putrefaciens CN32, a Gram-negative, facultative anaerobic bacterium that is capable of dissimilatory iron reduction, produced microscopic intracellular grains of iron oxide minerals during growth on two-line ferrihydrite in a hydrogen-argon atmosphere. The minerals, formed at iron concentrations found in the soil and sedimentary environments where these bacteria are active, could represent an unexplored pathway for the cycling of iron by bacteria.
Glasauer
Susan
S
Department of Microbiology, College of Biological Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada. sglasaue@micro.uoguelph.ca
Langley
Sean
S
Beveridge
Terry J
TJ
D015169:Colony Count, Microbial; D003460:Crystallization; D003470:Culture Media; D003594:Cytoplasmic Granules / Q000737:chemistry / Q000648:ultrastructure; D005290:Ferric Compounds / Q000032:analysis / Q000378:metabolism*; D005293:Ferritins / Q000378:metabolism*; D007501:Iron / Q000378:metabolism*; D008280:Magnetics; D008854:Microscopy, Electron; D008903:Minerals / Q000032:analysis / Q000378:metabolism*; D010084:Oxidation-Reduction; D020614:Shewanella putrefaciens / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D013057:Spectrum Analysis
D003470:Culture Media; D005290:Ferric Compounds; D008903:Minerals; C000499:ferric oxide; C092844:ferric oxyhydroxide; D005293:Ferritins; D007501:Iron