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Contribution to the taxonomy of haemolytic corynebacteria

J Julák1,2, M Mára1,2, F Patočka1,2

  • 1Laboratory of Special Medical Microbiology and Immunology, Faculty of Medicine, Charles University, 128 00, Prague 2.

Folia Microbiologica
|August 13, 2016
PubMed

Insights

This study differentiates hemolytic corynebacteria using biochemical markers. Streptococci are distinct from corynebacteria, with a unique aerobic subgroup identified.

Area of Science:

  • Microbiology
  • Bacterial Taxonomy
  • Biochemistry

Background:

  • Hemolytic corynebacteria, including human (Corynebacterium haemolyticum) and animal (Corynebacterium pyogenes bovis) strains, share characteristics with typical corynebacteria and streptococci.
  • Accurate taxonomic classification is crucial for understanding bacterial relationships and pathogenesis.

Purpose of the Study:

  • To assess the taxonomic relationships among human and animal hemolytic corynebacteria, typical corynebacteria, and streptococci.
  • To identify distinct biochemical profiles for accurate bacterial classification.

Main Methods:

  • Analysis of guanine-plus-cytosine (G+C) DNA content.
  • Detection of the cytochrome system.
  • Fatty acid composition analysis of free lipids.
  • Identification of carboxylic acids as fermentation end products.

Main Results:

  • Streptococci (group A and G) showed significant biochemical differences compared to all studied corynebacteria.
  • A distinct subgroup of aerobic hemolytic corynebacteria was identified.
  • This subgroup possessed a complete cytochrome system, produced propionic acid, and had a unique fatty acid profile.

Conclusions:

  • Biochemical parameters effectively distinguish streptococci from corynebacteria.
  • Biochemical analysis revealed a unique aerobic hemolytic corynebacteria subgroup, separate from human and animal strains.
  • These findings contribute to a refined understanding of hemolytic corynebacteria taxonomy.

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