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Kleemann, R. ; Meckenstock, R.U.

Anaerobic naphthalene degradation by Gram-positive, iron-reducing bacteria.

FEMS Microbiol. Ecol. 78, 488-496 (2011)
DOI PMC
Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.
An anaerobic naphthalene-degrading culture (N49) was enriched with ferric iron as electron acceptor. A closed electron balance indicated the total oxidation of naphthalene to CO(2) . In all growing cultures, the concentration of the presumed central metabolite of naphthalene degradation, 2-naphthoic acid, increased concomitantly with growth. The first metabolite of anaerobic methylnaphthalene degradation, naphthyl-2-methyl-succinic acid, was not identified in culture supernatants, which does not support a methylation to methylnaphthalene as the initial activation reaction of naphthalene, but rather a carboxylation, as proposed for other naphthalene-degrading cultures. Substrate utilization tests revealed that the culture was able to grow on 1-methyl-naphthalene, 2-methyl-naphthalene, 1-naphthoic acid or 2-naphthoic acid, whereas it did not grow on 1-naphthol, 2-naphthol, anthracene, phenanthrene, indane and indene. Terminal restriction fragment length polymorphism and 16S rRNA gene sequence analyses revealed that the microbial community of the culture was dominated by one bacterial microorganism, which was closely related (99% 16S sequence similarity) to the major organism in the iron-reducing, benzene-degrading enrichment culture BF [ISME J (2007) 1: 643; Int J Syst Evol Microbiol (2010) 60: 686]. The phylogenetic classification supports a new candidate species and genus of Gram-positive spore-forming iron-reducers that can degrade non-substituted aromatic hydrocarbons. It furthermore indicates that Gram-positive microorganisms might also play an important role in anaerobic polycyclic aromatic hydrocarbon-degradation.
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Publication type Article: Journal article
Document type Scientific Article
Keywords iron reduction; polycyclic aromatic hydrocarbons; 2-naphthoic acid; Peptococcaceae; groundwater
ISSN (print) / ISBN 0168-6496
e-ISSN 1574-6941
Journal FEMS Microbiology Ecology
Quellenangaben Volume: 78, Issue: 3, Pages: 488-496 Article Number: , Supplement: ,
Publisher Wiley
Publishing Place Oxford
Reviewing status Peer reviewed
Institute(s) Institute of Groundwater Ecology (IGOE)