Affiliation:
1. Abteilung Membranbiochemie, Max-Planck-Institut für Biochemie, D-82152 Martinsried, Germany
Abstract
ABSTRACT
Iron uptake and magnetite (Fe
3
O
4
) 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 μM O
2
at 30°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.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
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R. P.
Blakemore
N.
Magnetotactic magnetogens.Iron biominerals.FrankelR. B.BlakemoreR. P.19915168Plenum PressNew York N.Y
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