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Biochemistry (Moscow)

, Volume 72, Issue 11, pp 1247–1253 | Cite as

Disruption of a fur-like gene inhibits magnetosome formation in Magnetospirillum gryphiswaldense MSR-1

  • Huang Yijun 
  • Zhang Weijia 
  • Jiang Wei 
  • Rong Chengbo 
  • Li Ying Email author
Article

Abstract

In this study, a genomic library of Magnetospirillum gryphiswaldense MSR-1 strain was constructed and a fur-like gene (encoding Fur protein, ferric uptake regulator) was isolated and sequenced. This gene consisted of 420 bp and encoded 139 amino acid residues. To investigate the function of this gene in MSR-1, a fur mutant was generated by double crossover with a kanamycin cassette inserted into its coding region. Iron uptake and magnetosome formation were dramatically inhibited by disruption of fur. Iron content analysis of the fur mutant indicated that it contained approximately 0.037% by dry weight, which was at least 10-fold less than that observed in the wild type. Electron microscopy revealed the absence of a magnetosome in the fur mutant, although it was able to tolerate 1 mM H2O2 at 10-fold higher level than wild-type. These data suggest that Fur protein may possess a novel function in magnetic bacteria.

Key words

Magnetospirillum gryphiswaldense ferric uptake regulator (Fur) magnetosome formation 

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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • Huang Yijun 
    • 1
  • Zhang Weijia 
    • 1
  • Jiang Wei 
    • 1
  • Rong Chengbo 
    • 1
  • Li Ying 
    • 1
    Email author
  1. 1.State Key Laboratories for Agrobiotechnology and College of Biological SciencesChina Agricultural UniversityBeijingChina

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