title: Nocardioides aromaticivorans sp. nov., a dibenzofuran-degrading bacterium isolated from dioxin-polluted environments.
abstract: Seven strains of dibenzofuran (DF)-degrading bacteria isolated from dioxin-polluted environments were characterized. These isolates were able to grow with dibenzofuran as the sole carbon and energy source. During the growth with dibenzofuran, they produced a soluble yellow metabolite that exhibited a unique pH-dependent shift of absorption maxima. Dibenzo-p-dioxin and biphenyl were also degraded with pigment production. The isolates were strictly aerobic and chemoorganotrophic and had gram-positive, nonmotile, rod-shaped cells. Chemotaxonomic analyses showed that cells contained L,L-diaminopimeric acid in the peptidoglycan, branched-chain fatty acids as major fatty acids, and menaquinone MK-8(H4) as the sole respiratory quinone. The G + C content of the DNA of the isolates ranged from 72.0 to 72.4 mol%. The 16S rRNA gene sequences of the isolates were very similar to each other (> or = 99.8%). The phylogenetic analysis showed that the isolates formed a cluster with species of the genus Nocardioides with Nocardioides simplex and Nocardioides nitrophenolicus as their nearest neighbors. DNA-DNA hybridization studies showed that the isolates showed a hybridization level of less than 55% to any tested species of the genus Nocardioides. Based on these data, Nocardioides aromaticivorans sp. nov. is proposed for the new DF-degrading isolates. The type strain is strain H-1 (IAM 14992, JCM 11674, DSM 15131).
authors.affiliation: Graduate School of Fundamental Life Science, Kitasato University, Sagamihara, Kanagawa 228-8555, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kubota
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Kawahara
authors.forename: Kachiko
authors.initials: K
authors.lastname: Sekiya
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Uchida
authors.forename: Yasuko
authors.initials: Y
authors.lastname: Hattori
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Futamata
authors.forename: Akira
authors.initials: A
authors.lastname: Hiraishi
mesh_terms: D000192:Actinomycetales / Q000737:chemistry / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D015373:Bacterial Typing Techniques; D001572:Benzofurans / Q000378:metabolism*; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D004147:Dioxins / Q000378:metabolism*; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010641:Phenotype; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D045483:Rivers / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D001572:Benzofurans; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D004147:Dioxins; D012336:RNA, Ribosomal, 16S; D014874:Water Pollutants, Chemical; C023614:dibenzofuran