Initial characterization of a reductive dehalogenase from desulfitobacterium chlororespirans Co23

Frank E. Löffler, Robert A. Sanford, James M. Tiedje

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Desulfitobacterium chlororespirans Co23 is capable of using 3-chloro-4- hydroxybenzoate as terminal electron acceptor for growth. Membrane preparations from cells grown fermentatively on pyruvate in the presence of 3-chloro-4-hydroxybenzoate dechlorinated this compound at a rate of 3.9 nmol min-1 mg of protein-1. Fivefold-greater dechlorination rates were measured with reduced methyl viologen as the artificial electron donor. Reduced benzyl viologen, NADH, NADPH, reduced flavin adenine dinucleotide, and reduced flavin mononucleotide could not substitute for reduced methyl viologen. The maximal initial rate of catalysis was achieved at pH 6.5 and 60°C. The membrane-bound dechlorinating enzyme system was not oxygen sensitive and was stable at 57°C for at least 2 h. Sulfite inhibited dechlorination in cell-free assays, whereas sulfate did not. Several chlorophenols were dehalogenated exclusively in the ortho position by cell extracts.

Original languageEnglish (US)
Pages (from-to)3809-3813
Number of pages5
JournalApplied and environmental microbiology
Issue number10
StatePublished - Oct 1996
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology
  • Food Science
  • Applied Microbiology and Biotechnology
  • Ecology


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