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Volume 71, Issue 8

sp.nov., isolated from paper mill sewage No Access

Abstract

A novel, aerobic nitrogen-fixing methylotrophic bacterium, strain 29k, was enriched and isolated from sludge generated during wastewater treatment at a paper mill in Baikal, Russian Federation. Cells were Gram-stain-variable. The cell wall was of the negative Gram-type. Cells were curved oval rod-shaped, 0.5–0.7×1.7–3.4 µm and formed yellow-coloured colonies. Cells tended to be pleomorphic if grown on media containing succinate or coccoid if grown in the presence of methyl alcohol as the sole carbon source. Cells were non-motile, non-spore-forming and contained retractile (polyphosphate) and lipid (poly-β-hydroxybutyrate) bodies. The major respiratory quinone was ubiquinone Q-10 and the predominant cellular fatty acids were C ω7, C cyclo and C. The genomic DNA G+C content was 67.95 mol%. Strain 29k was able to grow at 4–37 °C (optimum, 30 °C), at pH 6.0–8.5 (optimum, pH 6.5–7.0) and at salinities of 0–0.5% (w/v) NaCl (optimum, 0% NaCl). Catalase and oxidase were positive. Strain 29k could grow chemolithoautotrophically in mineral media under an atmosphere of H, O and CO as well as chemoorganoheterotrophically on methanol, ethanol, n-propanol, n-butanol and various organic acids. The carbohydrate utilization spectrum is limited by glucose and raffinose. Phylogenetic analysis based on 16S rRNA gene sequences revealed that the newly isolated strain was a member of the genus with 7c (99.9% similarity) and 7d (99.4 % similarity) as closest relatives among species with validly published names. The average nucleotide identity and digital DNA–DNA hybridization values of 92.7 and 44.9%, respectively, of the 29k to the genome of the most closely related species, 7c, were below the species cutoffs. Based on genotypic, phenotypic and chemotaxonomic characteristics, it is proposed that the isolate represents a novel species, sp. nov. The type strain is 29k (=KCTC 72777=VKM B-3453).

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Keyword(s): genome , methylotrophy , nitrogen fixation , sewage , Xanthobacter and Xanthobacteraceae
© 2021 The Authors
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2021-08-19
2024-04-25
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Xanthobacter oligotrophicus sp.nov., isolated from paper mill sewage
Int J Syst Evol Microbiol 71, 004972 (2021); https://doi.org/10.1099/ijsem.0.004972
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