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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 11984(T)=ATCC 53295(T)).

Reclassification of Lactobacillus brevis strains LMG 11494 and LMG 11984 as Lactobacillus parabrevis sp. nov.