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Intraspecific diversity of Brevibacterium linens, Corynebacterium glutamicum and Rhodococcus erythropolis based on partial 16S rDNA sequence analysis and Fourier-transform infrared (FT-IR) spectroscopy

Microbial Ecology Group, Department of Biosciences, Technical University of Munich, Weihenstephaner Berg 3, D-85350 Freising-Weihenstephan, Germany¹

Author for correspondence: Siegfried Scherer. Tel: +49 8161 713516. Fax: +49 8161 714512. e-mail: siegfried.scherer{at}lrz.tum.de

The intraspecific diversity of 31 strains of Brevibacterium linens, 27 strains of Corynebacterium glutamicum and 29 strains of Rhodococcus erythropolis was determined by partial 16S rDNA sequence analysis and Fourier-transform infrared (FT-IR) spectroscopy. As a prerequisite for the analyses, 27 strains derived from culture collections which had carried invalid or wrong species designations were reclassified in accordance with polyphasic taxonomical data. FT-IR spectroscopy proved to be a rapid and reliable method for screening for similar isolates and for identifying these actinomycetes at the species level. Two main conclusions emerged from the analyses. (1) Comparison of intraspecific 16S rDNA similarities suggested that R. erythropolis strains have a very low diversity, B. linens displays high diversity and C. glutamicum occupies an intermediate position. (2) No correlation of FT-IR spectral similarity and 16S rDNA sequence similarity below the species level (i.e. between strains of one species) was observed. Therefore, diversification of 16S rDNA sequences and microevolutionary change of the cellular components detected by FT-IR spectroscopy appear to be de-coupled.

Keywords: coryneform bacteria, actinomycetes, 16S rDNA sequence analysis, identification, taxonomy

Abbreviations: FT-IR; Fourier-transform infrared

The GenBank accession numbers for the 16S rDNA gene sequences reported in this paper are AY017065 to AY017067, AY017069 to AY017087, and AF426135 to AF426143 for Brevibacterium linens; AY017088 to AY017091, AY017093 to AY017104, AY017107 to AY017111, and AF426144 to AF426149 for Corynebacterium glutamicum; and AY017113 to AY017126, AY017128 to AY017138, and AF426150 to AF426153 for Rhodococcus erythropolis.

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