Identification of genes coding for hydrolytic dehalogenation in the metagenome derived from a denitrifying 4-chlorobenzoate degrading consortium

Jong Chan Chae, Bongkeun Song, Gerben J. Zylstra

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A metagenomic approach was taken to investigate the genetic basis for the ability of an anaerobic consortium to grow on either 4-chlorobenzoate or 4-bromobenzoate under denitrifying conditions. Degenerate PCR primers were designed for the family of 4-chlorobenzoyl-CoA dehalogenase genes. The primers were utilized to screen a metagenome library and two overlapping clones were identified which yield a PCR product. The complete sequence of one metagenome clone was determined and genes encoding 4-chlorobenzoyl-CoA ligase (FcbA) and 4-chlorobenzoyl-CoA dehalogenase (FcbB) were identified. Analysis of the ORFs present in the nucleotide sequence suggests that the metagenome clone originated from an uncultured denitrifying microorganism belonging to the Betaproteobacteria. Interestingly, unlike similar gene clusters reported in aerobes, a gene encoding 4-hydroxybenzoyl-CoA thioesterase was not present in the gene cluster. This suggests that 4-hydroxybenzoyl-CoA is further degraded via the anaerobic reduction pathway in the corresponding microorganism instead of through thioester hydrolysis to yield 4-hydroxybenzoate.

Original languageEnglish (US)
Pages (from-to)203-209
Number of pages7
JournalFEMS Microbiology Letters
Volume281
Issue number2
DOIs
StatePublished - Apr 2008

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Molecular Biology
  • Genetics

Keywords

  • 4-chlorobenzoate
  • Denitrifying consortium
  • Hydrolytic dechlorination
  • Metagenome

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