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1 BCCM/LMG Bacteria Collection, Faculty of Sciences, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
2 Laboratory of Microbiology, Faculty of Sciences, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium
3 Research Group of Industrial Microbiology, Fermentation Technology and Downstream Processing (IMDO), Department of Applied Biological Sciences, Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
Correspondence
Marc Vancanneyt
Marc.Vancanneyt{at}UGent.be
A polyphasic study revealed taxonomic heterogeneity among reference strains of the species Lactobacillus brevis. Representative strains of L. brevis and related taxa were investigated by partial sequence analysis of the housekeeping gene encoding the alpha-subunit of phenylalanyl-tRNA synthase (pheS). Species-specific clusters were delineated for all taxa studied except for two L. brevis strains, LMG 11494 and LMG 11984, respectively isolated from cheese and wheat, which occupied a distinct position. Their phylogenetic affiliation was determined using 16S rRNA gene sequence analysis and it was found that both strains (with 99.9 % gene sequence similarity between them) belonged to the Lactobacillus buchneri group, with nearest neighbours Lactobacillus hammesii and L. brevis (gene sequence similarities of 99.2 and 98.1 %, respectively). Further genotypic and phenotypic studies, including fluorescent amplified fragment length polymorphism, DNA–DNA hybridization and DNA G+C content, clearly demonstrated that the two strains represent a single novel taxon for which the name Lactobacillus parabrevis sp. nov. is proposed (type strain LMG 11984T=ATCC 53295T).
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains LMG 11494 and LMG 11984T are AM158250 and AM158249, respectively.
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