Evolution of a pathway for chlorobenzene metabolism leads to natural attenuation in contaminated groundwater

Détails

ID Serval
serval:BIB_EEED089C66E9
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Evolution of a pathway for chlorobenzene metabolism leads to natural attenuation in contaminated groundwater
Périodique
Applied and Environmental Microbiology
Auteur(s)
van der Meer J.R., Werlen C., Nishino S.F., Spain J.C.
ISSN
1098-5336 (Electronic)
ISSN-L
0099-2240
Statut éditorial
Publié
Date de publication
1998
Peer-reviewed
Oui
Volume
64
Numéro
11
Pages
4185-4193
Langue
anglais
Résumé
Complete metabolism of chlorinated benzenes is not a feature that is generally found in aerobic bacteria but is thought to be due to a novel recombination of two separate gene clusters. Such a recombination could be responsible for adaptation of a natural microbial community in response to contamination with synthetic chemicals. This hypothesis was tested in a chlorobenzene (CB)-contaminated aquifer. CB-degrading bacteria from a contaminated site were characterized for a number of years by examining a combination of growth characteristics and DNA-DNA hybridization, PCR, and DNA sequence data. The genetic information obtained for the CB pathway of the predominant microorganism, Ralstonia sp. strain JS705, revealed a unique combination of (partially duplicated) genes for chlorocatechol degradation and genes for a benzene-toluene type of aromatic ring dioxygenase. The organism was detected in CB-polluted groundwater by hybridizing colonies cultivated on low-strength heterotrophic media with probes for the CB pathway. Southern hybridizations performed to determine the organization of the CB pathway genes and the 16S ribosomal DNA indicated that CB-degrading organisms isolated from different wells at the site were identical to JS705. Physiological characterization by the Biolog test system revealed some differences. The genes for the aromatic ring dioxygenase and dihydrodiol dehydrogenase of JS705 were detected in toluene and benzene degraders from the same site. Our results suggest that recent horizontal gene transfer and genetic recombination of existing genes between indigenous microorganisms were the mechanisms for evolution of the catabolic pathway. Evolution of the CB pathway seems to have created the capacity for natural attenuation of CB at the contaminated site.
Pubmed
Web of science
Création de la notice
21/01/2008 14:35
Dernière modification de la notice
03/03/2018 22:33
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