Current Microbiology

, Volume 59, Issue 1, pp 88–94 | Cite as

Conjugal Transformation and Transposon and Chemical Mutagenesis of Gram-Negative Selenate-Respiring Citrobacter sp. Strain JSA

  • Toshifumi SakaguchiEmail author
  • Masaki Kato
  • Naoki Kuriyama
  • Harutaka Niiyama
  • Shougo Hamada
  • Yasutaka Morita
  • Eiichi Tamiya


Conjugal mating between selenate-reducing Citrobacter sp. strain JSA and Escherichia coli S17-1 bearing pSUP2021 allowed transposon mutagenesis and chromosomal transformation. Kanamycin-resistant transconjugants were obtained successfully by this method from a freshwater selenate-respiring Citrobacter sp. strain JSA. The maximum frequency of kanamycin-resistant Tn5 transconjugants was 3.6 × 10−6 per recipient of this strain. Of these transconjugants, eight strains of selenate reduction-deficient transconjugants living by nitrate reduction were obtained in the strain JSA. Moreover, the same phenotype of deficient mutant was created by chemical mutagenesis with ethylmethanesulfonate. The results strongly indicate that selenate reducing anaerobic respiration was independent of nitrate reduction in the Citrobacter sp. isolate strain JSA.


Selenate Nitrate Reduction Anaerobic Growth Isolation Medium Sodium Selenate 
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We gratefully thank Dr. A. Pühler (W. Arnold, Universität Bielefeld, Germany) for the gift of Escherichia coli S17-1 harboring the plasmid pSUP1021. This work was partly supported by the Sasagawa Scientific Research Grant (research number: 14-381 M) from The Japan Science Society.


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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Toshifumi Sakaguchi
    • 1
    Email author
  • Masaki Kato
    • 2
  • Naoki Kuriyama
    • 3
  • Harutaka Niiyama
    • 3
  • Shougo Hamada
    • 1
    • 3
  • Yasutaka Morita
    • 3
    • 2
  • Eiichi Tamiya
    • 4
    • 2
  1. 1.Department of Environmental SciencesPrefectural University of HiroshimaShobaraJapan
  2. 2.Japan Advanced Institute Science and TechnologySchool of Materials ScienceNomiJapan
  3. 3.Department of Biological and Environmental ChemistryKinki University, KyushuIizuka, FukuokaJapan
  4. 4.Department of Applied Physics, Nano-Biology DivisionOsaka UniversitySuitaJapan

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