Global transcriptome analysis of the tetrachloroethene-dechlorinating bacterium Desulfitobacterium hafniense Y51 in the presence of various electron donors and terminal electron acceptors

  • Xue Peng
  • Shogo Yamamoto
  • Alain A. Vertès
  • Gabor Keresztes
  • Ken-ichi Inatomi
  • Masayuki Inui
  • Hideaki Yukawa
Original Paper

Abstract

Desulfitobacterium hafniense Y51 is a dechlorinating bacterium that encodes an unusually large set of O-demethylase paralogs and specialized respiratory systems including specialized electron donors and acceptors. To use this organism in bioremediation of tetrachloroethene (PCE) or trichloroethene (TCE) pollution, expression patterns of its 5,060 genes were determined under different conditions using 60-mer probes in DNA microarrays. PCE, TCE, fumarate, nitrate, and dimethyl sulfoxide (DMSO) respiration all sustain the growth of strain Y51. Global transcriptome analyses were thus performed using various electron donor and acceptor couples (respectively, pyruvate and either fumarate, TCE, nitrate, or DMSO, and vanillate/fumarate). When TCE is used as terminal electron acceptor, resulting in its detoxification, a series of electron carriers comprising a cytochrome bd-type quinol oxidase (DSY4055-4056), a ferredoxin (DSY1451), and four Fe–S proteins (DSY1626, DSY1629, DSY0733, DSY3309) are upregulated, suggesting that the products of these genes are involved in PCE oxidoreduction. Interestingly, the PCE dehalogenase cluster (pceABCT) is constitutively expressed in the media tested, with pceT being upregulated and pceC downregulated in pyruvate/TCE-containing medium. In addition, another dehalogenation enzyme (DSY1155 coding for a putative chlorophenol reductive dehalogenase), is induced 225-fold in that medium, despite not being involved in PCE respiration. Remarkably since the reducing equivalents formed during pyruvate conversion to acetyl-CoA are channeled to electron acceptors including halogenated compounds, pyruvate induces expression of a pyruvate:ferredoxin oxidoreductase. This study paves the way to understanding the physiology of D. hafniense, optimizing this microbe as a bioremediation agent, and designing bioarray sensors to monitor the presence of dechlorinating organisms in the environment.

Keywords

Desulfitobacterium hafniense Bioremediation Dechlorination Dehalorespiration Tetrachloroethene 

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Copyright information

© Society for Industrial Microbiology 2011

Authors and Affiliations

  • Xue Peng
    • 1
    • 2
  • Shogo Yamamoto
    • 1
  • Alain A. Vertès
    • 1
  • Gabor Keresztes
    • 1
  • Ken-ichi Inatomi
    • 1
  • Masayuki Inui
    • 1
  • Hideaki Yukawa
    • 1
  1. 1.Molecular Microbiology and Biotechnology GroupResearch Institute of Innovative Technology for the Earth (RITE)KyotoJapan
  2. 2.School of Life SciencesXuzhou Normal UniversityXuzhouChina

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