Abstract
Six aerobic Gram-negative bacteria were isolated from seawater in Guangdong Province, P.R. China. Cells were observed to be Gram-negative, aerobic, non-motile and non-spore forming. Growth of the designated type strain 19X3-30T occurred at a temperature range of 14–37 °C (optimum, 28 °C), a pH range of 6.0–8.0 (optimum, pH 7) and up to 7.5% NaCl (optimum, 1.5%; w/v), and was enhanced by CO2 and L-cysteine supplementation. The major polar lipids identified in strain 19X3-30T were diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylglycerol. The principal cellular fatty acids profile showed the presence of anteiso-C15:0, anteiso-C17:0 and C18:0 (> 8% of total fatty acids), and the respiratory quinone was ubiquinone 8 (UQ-8). According to the analysis of 16S rRNA gene sequences, these strains represented a novel species within the family Fastidiosibacteraceae, sharing maximum similarities with Cysteiniphilum litorale DSM 101832T (96.6%) and Cysteiniphilum halobium DSM 103992T (95.3%). Phylogenetic dendrograms based on 16S rRNA gene and protein marker genes from the genomic sequences both indicated that the strains formed a monophyletic lineage closely linked to the genus Cysteiniphilum, which was also supported by the UPGMA dendrogram based on the MALDI-TOF MS profile. The genomic DNA G + C contents of six strains ranged from 38.0% to 38.1%. Based on different taxonomic genomic metrics, phylogeny and phenotypic features, we propose that the strains warrant the assignment to a novel species, for which the name Cysteiniphilum marinum sp. nov. is proposed. The type strain is 19X3-30T (= KCTC 82154T = CGMCC 1.18585T).
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Abbreviations
- AAI:
-
Average amino acid identity
- ANI:
-
Average nucleotide identity
- BCYEα :
-
Buffered charcoal yeast extract medium supplemented with α-ketoglutaric acid
- CLSI:
-
The Clinical and Laboratory Standards Institute
- FAME:
-
Fatty acid methyl ester
- GC:
-
Gas chromatography
- G + C:
-
Guanine-plus-cytosine
- HPLC:
-
High performance liquid chromatography
- MALDI-TOF MS:
-
Matrix-Assisted Laser Desorption Ionization Time of Flight Mass Spectrometry
- MEGA:
-
Molecular Evolutionary Genetics Analysis
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Acknowledgements
This research was supported by funds received from the Natural Science Foundation of Guangdong Province (2020A1515011119), Guangdong Province Ordinary Universities Characteristic Innovation Project (2018KTSCX042), and the Science and Technology Planning Project of Guangdong Province (2017A020215068).
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WJL, PHQ and MX designed research and project outline. HML, JHF, RQL, MML and YL performed the experiments. JHF, LHL MML and FC analysed the data. HML and JHF drafted the manuscript. All authors have read and approved the final manuscript.
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Luo, HM., Feng, JH., Li, LH. et al. Cysteiniphilum marinum sp. nov., isolated from coastal seawater. Antonie van Leeuwenhoek 114, 1079–1089 (2021). https://doi.org/10.1007/s10482-021-01579-7
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DOI: https://doi.org/10.1007/s10482-021-01579-7