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Nocardia puris sp. nov.

A F Yassin1, B Sträubler2, P Schumann2

  • 1Institut für Medizinische Mikrobiologie und Immunologie der Universität Bonn, D-53127 Bonn, Germany.

International Journal of Systematic and Evolutionary Microbiology
|September 18, 2003
PubMed
Summary

A novel bacterial species, Nocardia puris, was identified from a human abscess. This bacterium is distinct from other Nocardia species based on genetic and phenotypic analyses.

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Area of Science:

  • Microbiology
  • Bacterial Taxonomy
  • Medical Bacteriology

Background:

  • Human abscesses can harbor diverse bacterial species.
  • Accurate bacterial identification is crucial for effective treatment and understanding pathogenesis.
  • The genus Nocardia includes several clinically relevant species, necessitating clear taxonomic distinctions.

Purpose of the Study:

  • To perform a comprehensive taxonomic characterization of a bacterial isolate from a human abscess.
  • To determine the phylogenetic and genotypic relationship of the isolate to known Nocardia species.
  • To propose the classification of the isolate as a new species within the genus Nocardia.

Main Methods:

  • Polyphasic taxonomic study including chemotaxonomic analysis (cell wall chemotype, mycolic acids).

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  • Comparative 16S rRNA gene sequencing for phylogenetic analysis.
  • DNA-DNA hybridization to assess genomic relatedness with closely related species.

    • Main Results:

    • The isolate exhibited chemotaxonomic features characteristic of the genus Nocardia.
    • 16S rRNA gene sequencing revealed a distinct subline within Nocardia, with >1.7% divergence from known species.
    • DNA-DNA hybridization confirmed significant genomic distinctiveness from Nocardia abscessus, Nocardia cyriacigeorgica, and Nocardia farcinica.

    Conclusions:

    • The isolate represents a new species within the genus Nocardia.
    • The proposed name for the new species is Nocardia puris.
    • The type strain for Nocardia puris is IMMIB R-145(T).