Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Energy Generation Coupled to Azoreduction by Membranous Vesicles from Shewanella decolorationis S12

  • Hong, Yi-Guo (Key Laboratory of Tropical Marine Environment Dynamics (LED), South China Sea Institute of Oceanology, Chinese Academy of Science) ;
  • Guo, Jun (Guangdong Institute of Microbiology) ;
  • Sun, Guo-Ping (Guangdong Institute of Microbiology)
  • Received : 2008.05.14
  • Accepted : 2008.06.18
  • Published : 2009.01.31
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Abstract

Previous studies have demonstrated that Shewanella decolorationis S12 can grow on the azo compound amaranth as the sole electron acceptor. Thus, to explore the mechanism of energy generation in this metabolism, membranous vesicles (MVs) were prepared and the mechanism of energy generation was investigated. The membrane, which was fragmentized during preparation, automatically formed vesicles ranging from 37.5-112.5 nm in diameter under electron micrograph observation. Energy was conserved when coupling the azoreduction by the MVs of an azo compound or Fe(III) as the sole electron acceptor with $H_2$, formate, or lactate as the electron donor. The amaranth reduction by the vesicles was found to be inhibited by specific respiratory inhibitors, including $Cu^{2+}$ ions, dicumarol, stigmatellin, and metyrapone, indicating that the azoreduction was indeed a respiration reaction. This finding was further confirmed by the fact that the ATP synthesis was repressed by the ATPase inhibitor N,N'-dicyclohexylcarbodiimide (DCCD). Therefore, this study offers solid evidence of a mechanism of microbial dissimilatory azoreduction on a subcell level.

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