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J. Bacteriol., 01 1998, 159-162, Vol 180, No. 1
Copyright © 1998, American Society for Microbiology

Dynamics of iron uptake and Fe3O4 biomineralization during aerobic and microaerobic growth of Magnetospirillum gryphiswaldense [In Process Citation]

D Schuler and E Baeuerlein
Abteilung Membranbiochemie, Max-Planck-Institut fur Biochemie, Martinsried, Germany.

Iron uptake and magnetite (Fe3O4) crystal formation could be studied in the microaerophilic magnetic bacterium Magnetospirillum gryphiswaldense by using a radioactive tracer method for iron transport and a differential light-scattering technique for magnetism. Magnetite formation occurred only in a narrow range of low oxygen concentration, i.e., 2 to 7 microM O2 at 30 degrees C. Magnetic cells stored up to 2% iron as magnetite crystals in intracytoplasmic vesicles. This extraordinary uptake of iron was coupled tightly to the biomineralization of up to 60 magnetite crystals with diameters of 42 to 45 nm.


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