Abstract
Gram-stain-negative, aerobic, rod-shaped, non-motile bacterium strain ZFBP2030T was isolated from a rock on the North slope of Mount Everest. This strain contained a unique ubiquinone-10 (Q-10) as a predominant respiratory quinone. Among the tested fatty acids, the strain contained summed feature 8, C14:0 2OH, and C16:0, as major cellular fatty acids. The polar lipid profile contained phosphatidyl glycerol, phosphatidyl ethanolamine, three unidentified phospholipids, two unidentified aminolipids, and six unidentified lipids. The cell-wall peptidoglycan was a meso-diaminopimelic acid, and cell-wall sugars were ribose and galactose. Phylogenetic analyses based on 16S rRNA gene sequence revealed that strain ZFBP2030T was a member of the genus Sphingomonas, exhibiting high sequence similarity to the 16S rRNA gene sequences of Sphingomonas aliaeris DH-S5T (97.9%), Sphingomonas alpina DSM 22537T (97.3%) and Sphingomonas hylomeconis CCTCC AB 2013304T (97.0%). The 16S rRNA gene sequence similarity between ZFBP2030T and other typical strains was less than 97.0%. The average amino acid identity values, average nucleotide identity, and digital DNA–DNA hybridization values between strain ZFBP2030T and its highest sequence similarity strains were 56.9–79.9%, 65.1–82.2%, and 19.3–25.8%, respectively. The whole-genome size of the novel strain ZFBP2030T was 4.1 Mbp, annotated with 3838 protein-coding genes and 54 RNA genes. Moreover, DNA G + C content was 64.7 mol%. Stress-related functions predicted in the subsystem classification of the strain ZFBP2030T genome included osmotic, oxidative, cold/heat shock, detoxification, and periplasmic stress responses. The overall results of this study clearly showed that strain ZFBP2030T is a novel species of the genus Sphingomonas, for which the name Sphingomonas endolithica sp. nov. is proposed. The type of strain is ZFBP2030T (= EE 013T = GDMCC 1.3123T = JCM 35386T).
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This work was supported by the National Natural Science Foundation of China (31870479, 42071099), and the Scientific Project of Gansu Province, China (20YF3WA007, 20JR5RA548).
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MT, WZ, GZ, YW, GL, and TC conceived and designed the study. MT, GZ, YW, and XY carried out the experiments. MT, XY, and SW performed data analysis and figure drawing. MT wrote the manuscript. WZ, AB, GL, TC, YW, and SW supervised this work and edited the manuscript.
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Tian, M., Zhang, W., Zhang, G. et al. A novel UV-resistant bacterium Sphingomonas endolithica sp. nov., and genomic analysis, isolated from the north slope of Mount Everest. Antonie van Leeuwenhoek 117, 5 (2024). https://doi.org/10.1007/s10482-023-01903-3
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DOI: https://doi.org/10.1007/s10482-023-01903-3