Current Microbiology

, Volume 58, Issue 2, pp 177–181 | Cite as

Identification of Iron Transporters Expressed in the Magnetotactic Bacterium Magnetospirillum magnetotacticum

  • Azuma Taoka
  • Chihiro Umeyama
  • Yoshihiro Fukumori


The magnetotactic bacterium Magnetospirillum magnetotacticum MS-1 mineralizes the magnetite (Fe3O4) crystal and organizes a highly ordered intracellular structure, called the magnetosome. However, the iron transport system, which supports the biogenesis of magnetite, is not fully understood. In this study, we first identified the expressions of both the ferric and the ferrous iron transporter proteins in M. magnetotacticum. The cellular protein compositions of ferric and ferrous iron-rich cultures were examined using two-dimensional electrophoresis. According to the gel patterns, two outer-membrane ferric-siderophore receptor homologues were identified as proteins strongly induced in the ferrous iron-rich condition. Also, we identified for the first time that the ferrous iron transport protein, FeoB, is expressed in the M. magnetotacticum cytoplasmic membrane using immunoblotting.


Ferrous Iron Sodium Ascorbate Magnetotactic Bacterium Magnetospirillum Iron Uptake System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



This work was supported by a Human Frontier Science Program Research Grant (RGP0035/2004-C104) to Y.F. and a Grant-in-Aid for Scientific Research on Priority Areas (16087205) to Y.F. from the Ministry of Education, Culture, Sports, Science and Technology of Japan.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Azuma Taoka
    • 1
  • Chihiro Umeyama
    • 1
  • Yoshihiro Fukumori
    • 1
  1. 1.Department of Life Science, Graduate School of Natural Science and TechnologyKanazawa UniversityKanazawaJapan

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