Schüler D, Baeuerlein E
Abteilung Membranbiochemie, Max-Planck-Institut für Biochemie, Martinsried, Germany.
J Bacteriol. 1998 Jan;180(1):159-62. doi: 10.1128/JB.180.1.159-162.1998.
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.
通过使用放射性示踪法研究铁转运以及使用微分光散射技术研究磁性,可以在微需氧磁性细菌格氏嗜盐碱杆菌中研究铁摄取和磁铁矿(Fe3O4)晶体形成。磁铁矿的形成仅发生在低氧浓度的狭窄范围内,即在30℃时为2至7微摩尔O2。磁性细胞在胞质内小泡中以磁铁矿晶体的形式储存高达2%的铁。这种非凡的铁摄取与多达60个直径为42至45纳米的磁铁矿晶体的生物矿化紧密相关。