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Leptospira dzianensis and Leptospira putramalaysiae were recently described as novel species and published almost concurrently with Leptospira yasudae and Leptospira stimsonii. Genome comparisons based on average nucleotide identity of the type strain genomes indicate that L. dzianensis and L. putramalaysiae are conspecific with L. yasudae and L. stimsonii, respectively. Based on the rules of priority, L. dzianensis should be reclassified as a later heterotypic synonym of L. yasudae, and L. putramalaysiae should be reclassified as a later heterotypic synonym of L. stimsonii.Rhodobacter sphaeroides can use C4-dicarboxylic acids to grow heterotrophically or photoheterotropically, and it was previously demonstrated in Rhodobacter capsulatus that the DctPQM transporter system is essential to support growth using these organic acids under heterotrophic but not under photoheterotrophic conditions. In this work we show that in R. sphaeroides this transporter system is essential for photoheterotrophic and heterotrophic growth, when C4-dicarboxylic acids are used as a carbon source. We also found that over-expression of dctPQM is detrimental for photoheterotrophic growth in the presence of succinic acid in the culture medium. In agreement with this, we observed a reduction of the dctPQM promoter activity in cells growing under these conditions, indicating that the amount of DctPQM needs to be reduced under photoheterotrophic growth. It has been reported that the two-component system DctS and DctR activates the expression of dctPQM. Our results demonstrate that in the absence of DctR, dctPQM is still expressed albeit at a low level. In this work, we have found that the periplasmic component of the transporter system, DctP, has a role in both transport and in signalling the DctS/DctR two-component system.The polyphasic taxonomic approach was used to characterize a novel bacteria strain, designated SG-8T, which was isolated from intestinal content of a Pacific white shrimp (Penaeus vannamei). Cells were Gram-stain-negative, aerobic, non-gliding rods. Growth occurred at 10-45 °C (optimum, 20-30 °C), pH 5.0-10.0 (optimum, 6.0-7.0) and in 0-6.0 % (w/v) NaCl (optimum, 0-4.0 %). The 16S rRNA gene sequence of strain SG-8T showed the highest sequence similarity to Lysobacter maris KMU-14T (98.6 %). On phylogenetic trees, strain SG-8T formed a stable cluster with Lysobacter maris KMU-14T, Lysobacter alkalisoli SJ-36T, Lysobacter spongiae 119BY6-57T and Lysobacter aestuarii S2-CT. The average nucleotide identity and digital DNA-DNA hybridization values between strain SG-8T and the four reference type strains listed above were 83.3, 82.3, 83.5, 83.3% and 22.8, 22.7, 22.7, 22.9 %, respectively. The major fatty acids (>5 %) were iso-C15 0, summed feature 9 (iso-C17 1 ω9c and/or 10-methyl C16 0), iso-C16 0, summed feature 3 (C16 1 ω6c and/or C16 1 ω7c), iso-C17 0, iso-C11 0 3OH and iso-C11 0. Ubiquinone-8 (Q-8) was the only respiratory quinone. The major polar lipids were phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylglycerol. The DNA G+C content was 68.8 mol%. Based on the results of genomic, phylogenetic, phenotypic and chemotaxonomic analyses, strain SG-8T represents a novel species of the genus Lysobacter, for which the name Lysobacter penaei sp. nov. is proposed. The type strain is SG-8T (=GDMCC 1.1817T=KACC 21942T).The mobilome plays a crucial role in bacterial adaptation and is therefore a starting point to understand and establish the gene flow occurring in the process of bacterial evolution. This is even more so if we consider that the mobilome of environmental bacteria can be the reservoir of genes that may later appear in the clinic. Recently, new genera have been proposed in the family Mycobacteriaceae, including the genus Mycolicibacterium, which encompasses dozens of species of agricultural, biotechnological, clinical and ecological importance, being ubiquitous in several environments. The current scenario in the Mycobacteriaceae mobilome has some bias because most of the characterized mycobacteriophages were isolated using a single host strain, and the few plasmids reported mainly relate to the genus Mycobacterium. To fill in the gaps in these issues, we performed a systematic in silico study of these mobile elements based on 242 available genomes of the genus Mycolicibacterium. The analyses identified 156 putative plasmids (19 conjugative, 45 mobilizable and 92 non-mobilizable) and 566 prophages in 86 and 229 genomes, respectively. Moreover, a contig was characterized by resembling an actinomycete integrative and conjugative element (AICE). Within this diversity of mobile genetic elements, there is a pool of genes associated with several canonical functions, in addition to adaptive traits, such as virulence and resistance to antibiotics and metals (mercury and arsenic). The type-VII secretion system was a common feature in the predicted plasmids, being associated with genes encoding virulent proteins (EsxA, EsxB, PE and PPE). In addition to the characterization of plasmids and prophages of the family Mycobacteriaceae, this study showed an abundance of these genetic elements in a dozen species of the genus Mycolicibacterium.Enterococcus lactis was published in the International Journal of Systematic and Evolutionary Microbiology in June 2012. Enterococcus xinjiangensis was published in Current Microbiology in 2016 and validated in November 2020. In the present study, the relationship between E. lactis and E. https://www.selleckchem.com/products/ak-7.html xinjiangensis was re-evaluated. In the 16S rRNA gene phylogeny, E. xinjiangensis was closely related to E. lactis and Enterococcus faecium. The type strains of E. xinjiangensis and E. lactis shared 99.8 % 16S rRNA gene sequence similarity, 98.5 % pheS sequence similarity, 99.9 % rpoA sequence similarity, 98.7 % average nucleotide identity (ANI) value and 88.9 % digital DNA-DNA hybridization (dDDH) value, indicating that they represent the same species. Meanwhile, although the type strains of E. xinjiangensis and E. faecium also shared 99.8 % 16S rRNA gene sequence similarity, 97.1 % pheS sequence similarity and 99.6 % rpoA sequence similarity, 94.7 % ANI and 59.1 % dDDH values indicated that they represent two different species.
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