Characterization of diverse heterocyclic amine-degrading denitrifying bacteria from various environments

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Although, there have been many published bacterial strains aerobically degrading the heterocyclic amine compounds, only one strain to date has been reported to degrade pyrrolidine under denitrifying conditions. In this study, denitrifying bacteria degrading pyrrolidine and piperidine were isolated from diverse geological and ecological origins through selective enrichment procedures. Based on the comparative sequence results of 16S rRNA genes, 30 heterocyclic amine-degrading isolates were grouped into ten distinct phylotypes belonging to the genera Thauera, Castellaniella, Rhizobium, or Paracoccus of the phylum Proteobacteria. The representative isolates of individual phylotypes were characterized by phylogenetic, phenotypic and chemotaxonomical traits, and dissimilatory nitrite reductase gene (nirK and nirS). All isolates completely degraded pyrrolidine and piperidine under both aerobic and anaerobic conditions. The anaerobic degradations were coupled to nitrate reduction. A metabolic pathway for the anaerobic degradation of pyrrolidine was proposed on the basis of enzyme activities implicated in pyrrolidine metabolism from three isolates. The three key pyrrolidine-metabolizing enzymes pyrrolidine dehydrogenase, gamma-aminobutyrate/alpha-ketoglutarate aminotransferase, and succinic semialdehyde dehydrogenase, were induced by heterocyclic amines under denitrifying conditions. They were also induced in cells grown aerobically on heterocyclic amines, suggesting that the anaerobic degradation of pyrrolidine shares the pathway with aerobic degradation.
Publisher
SPRINGER
Issue Date
2009-04
Language
English
Article Type
Article
Keywords

NITRITE REDUCTASE GENES; NITRATE-REDUCING CONDITIONS; SP-NOV; ANAEROBIC DEGRADATION; ALCALIGENES-DEFRAGRANS; PYRROLIDINE METABOLISM; THAUERA-AROMATICA; CYCLIC AMINES; BETA-SUBCLASS; MORPHOLINE

Citation

ARCHIVES OF MICROBIOLOGY, v.191, pp.329 - 340

ISSN
0302-8933
DOI
10.1007/s00203-008-0452-9
URI
http://hdl.handle.net/10203/101104
Appears in Collection
BS-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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