1887

Abstract

Members of the genus are responsible for cutaneous, pulmonary and disseminated human infections. From 2003 to 2008, four nocardioform strains (W8027, W8681, W9071 and W9241) were isolated from patients in the state of Florida, USA. Ribosomal gene sequencing analysis suggested that a novel species of the genus had been isolated. These strains were subjected to a taxonomic analysis using a polyphasic approach. Phenotypic analyses included morphological examination, biochemical profiling and antimicrobial susceptibility testing. Molecular studies included 16S rRNA and DNA gyrase B subunit ( gene sequence analyses and DNA–DNA hybridization. Phylogenetic neighbours were determined through 16S rRNA and gene sequence analyses. Phenotypic characteristics that differentiated the novel isolates from phylogenetically related species were growth at 45 °C, and three of the four novel strains utilized -rhamnose. The antimicrobial profiles could not reliably distinguish the novel species from related nocardiae. Analysis showed that the 16S rRNA gene sequences of the four novel isolates were identical. The analysis of the near full-length 16S rRNA gene showed 99.2 % sequence similarity to DSM 44729, DSM 44731 and JCM 10666, 98.7 % to DSM 45066, 98.2 % to JCM 12119 and 97.8 % to JCM 13313. Analysis of partial gene sequences showed that the novel isolates had 95.4 % similarity to DSM 44731, 95.3 % to DSM 44956, 94.4 % to JCM 12119, 93.8 % to DSM 44668, 93.5 % to DSM 45066, 93.4 % to JCM 10666 and 93.2 % to DSM 44729. The DNA–DNA relatedness values between the four novel strains were 86–89 %; the relatedness value for strain W9241 compared with JCM 10666 was 47 % and 46 % with DSM 44729, 44 % with DSM 44731, 32 % with DSM 45066 and 20 % with DSM 44668. The results of the taxonomic analysis suggested that the new isolates represent a novel species of the genus for which the name sp. nov. is proposed. The type strain is W9241 (=DSM 45340=CCUG 57756).

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2011-02-01
2024-03-28
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