Lactobacillus mulieris sp. nov., a new species of Lactobacillus delbrueckii group

Abstract

One Gram-stain-positive, non-motile, non-spore-forming, catalase-negative, and coccobacilli-shaped strain, designated c10Ua161M^T, was isolated from a urine sample from a reproductive-age healthy woman. Comparative 16S rRNA gene sequence analysis indicated that strain c10Ua161M^T belonged to the genus Lactobacillus. Phylogenetic analysis based on pheS and rpoA gene sequences strongly supported a clade encompassing strains c10Ua161M^T and eight other strains from public databases, distinct from currently recognized species of the genus Lactobacillus. In silico Average Nucleotide Identity (ANI) and Genome-to-Genome Distance Calculator (GGDC), showed 87.9 and 34.3 % identity to the closest relative Lactobacillus jensenii, respectively. The major fatty acids of strain c10Ua161M^T were C_{18 : 1}ω9c (65.0%), C_{16 : 0} (17.8%), and summed feature 8 (10.2 %; comprising C_{18 : 1}ω7c, and/or C_{18 : 1}ω6c). The DNA G+C content of the strains is 34.2 mol%. On the basis of data presented here, strain c10Ua161M^T represents a novel species of the genus Lactobacillus, for which the name Lactobacillus mulieris sp. nov. is proposed. The type strain is c10Ua161M^T (=CECT 9755^T=DSM 108704^T).

Keywords: 16S rRNA; fatty acid; genome; pheS; rpoA.