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Mycobacterium seoulense sp. nov., a slowly growing scotochromogenic species

¹ Department of Microbiology and Immunology, Cancer Research Institute and Liver Research Institute, College of Medicine, Seoul National University, Seoul 110-799, Korea
² The Korean Institute of Tuberculosis, The Korean National Tuberculosis Association, Seoul 137-140, Korea

Correspondence
Bum-Joon Kim
kbumjoon{at}snu.ac.kr

A previously undescribed, slowly growing, scotochromogenic mycobacterium was isolated from a patient with symptomatic pulmonary infection during hsp65 sequence-based identification of Korean clinical isolates. Phenetic characteristics of this strain were generally similar to those of Mycobacterium nebraskense and Mycobacterium scrofulaceum. However, some phenetic characteristics differentiated it from these two species. Its 16S rRNA gene sequences were unique and phylogenetic analysis based on 16S rRNA gene sequences placed the organism in the slowly growing Mycobacterium group close to M. nebraskense and M. scrofulaceum. Its unique mycolic acid profiles and the results of phylogenetic analysis based on two independent alternative chronometer molecules, hsp65 and rpoB, confirmed the taxonomic status of this strain as representing a novel species. These data support the conclusion that this strain represents a novel mycobacterial species, for which the name Mycobacterium seoulense sp. nov. is proposed. The type strain is strain 03-19^T (=DSM 44998^T=KCTC 19146^T).

The GenBank/EMBL/DDBJ accession numbers for the partial 16S rRNA gene, hsp65 and rpoB sequences of strain 03-19^T are respectively DQ536403, DQ536401 and DQ536405.

Sequence alignments and neighbour-joining trees based on hsp65 and rpoB sequences are available as supplementary material in IJSEM Online.

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