Reductive dechlorination of tetrachloroethene by a stepwise catalysis of different organohalide respiring bacteria and reductive dehalogenases. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biodegradation Année : 2011

Reductive dechlorination of tetrachloroethene by a stepwise catalysis of different organohalide respiring bacteria and reductive dehalogenases.

Julien Maillard
  • Fonction : Auteur
Marie-Paule Charnay
  • Fonction : Auteur
Emmanuelle Rohrbach-Brandt
  • Fonction : Auteur
Katia Rouzeau-Szynalski
  • Fonction : Auteur
Pierre Rossi
  • Fonction : Auteur
Christof Holliger
  • Fonction : Auteur

Résumé

The enrichment culture SL2 dechlorinating tetrachloroethene (PCE) to ethene with strong trichloroethene (TCE) accumulation prior to cis-1,2-dichloroethene (cis-DCE) formation was analyzed for the presence of organohalide respiring bacteria and reductive dehalogenase genes (rdhA). Sulfurospirillum-affiliated bacteria were identified to be involved in PCE dechlorination to cis-DCE whereas "Dehalococcoides"-affiliated bacteria mainly dechlorinated cis-DCE to ethene. Two rdhA genes highly similar to tetrachloroethene reductive dehalogenase genes (pceA) of S. multivorans and S. halorespirans were present as well as an rdhA gene very similar to the trichloroethene reductive dehalogenase gene (tceA) of "Dehalococcoides ethenogenes" strain 195. A single strand conformation polymorphism (SSCP) method was developed allowing the simultaneous detection of the three rdhA genes and the estimation of their abundance. SSCP analysis of different SL2 cultures showed that one pceA gene was expressed during PCE dechlorination whereas the second was expressed during TCE dechlorination. The tceA gene was involved in cis-DCE dechlorination to ethene. Analysis of the internal transcribed spacer region between the 16S and 23S rRNA genes revealed two distinct sequences originating from Sulfurospirillum suggesting that two Sulfurospirillum populations were present in SL2. Whether each Sulfurospirillum population was catalyzing a different dechlorination step could however not be elucidated.

Dates et versions

hal-00622525 , version 1 (12-09-2011)

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Citer

Julien Maillard, Marie-Paule Charnay, Christophe Regeard, Emmanuelle Rohrbach-Brandt, Katia Rouzeau-Szynalski, et al.. Reductive dechlorination of tetrachloroethene by a stepwise catalysis of different organohalide respiring bacteria and reductive dehalogenases.. Biodegradation, 2011, 22 (5), pp.949-60. ⟨10.1007/s10532-011-9454-4⟩. ⟨hal-00622525⟩
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