Abstract
A novel bacterium designated A3.4T was isolated from the beach sediment of Zhairuo Island, which is located in the East China Sea. Strain A3.4T was found to be Gram-stain negative, cream coloured, rod-shaped, aerobic and motile via a single monopolar flagellum. The isolate grows at 20–37 °C (optimum 25–30 °C), at pH 6.0–8.0 (optimum pH 7.0–8.0), and in the presence of 0–5.0% (w/v) NaCl (optimum 0.5–1%). A3.4T has catalase and oxidase activity. The predominant fatty acids (≥ 10%) of the strain were identified as C16:0, summed feature 3 (C16:1 ω7c /C16:1 ω6c) and summed feature 8 (C18:1 ω7c /C18:1 ω6c). Q-9 was identified as the major isoprenoid quinone, with trace levels of Q-8 present. The major polar lipids were identified as diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylglycerol. The draft genome size is 3.55 Mb, with a DNA G + C content of 57.7 mol%. Analysis of the 16S rRNA gene sequence of strain A3.4T indicates that it belongs to the genus Atopomonas and shares high sequence similarity with Atopomonas hussainii JCM 19513T (97.60%). This classification was also supported by phylogenetic analysis using rpoB and several core genes. The genome of strain A3.4T shows an average nucleotide identity of 82.3%, an amino acid identity of 83.0%, and a digital DNA–DNA hybridization value of 22.1% with A. hussainii. In addition, 20 conserved signature indels (CSIs) were identified to be specific for A3.4T and A. hussainii, demonstrating that the strain A3.4T is closely related to A. hussainii rather than other species of family Pseudomonadaceae. Hundreds of unique genes were identified in the genomes of A3.4T and A. hussainii, which may underly multiple phenotypic differences between these strains. Based on phenotypic, chemotaxonomic, phylogenetic, and genomic investigations, strain A3.4T is concluded to represent a novel species of the genus Atopomonas, for which the name Atopomonas sediminilitoris sp. nov. is proposed. The type strain is A3.4T (= LMG 32563T = MCCC 1K07166T).
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Acknowledgements
We thank Dr. Xu Youping (Analysis Center of Agrobiology and Environmental Sciences, Faculty of Agriculture, Life and Environment Sciences, Zhejiang University) for fatty acid analysis. We also thank the equipment support of the Field Scientific Observation and Research Station of Ministry of Education of Marine Ecosystem in Zhoushan Islands, Zhejiang Province.
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This study was supported by a grant from the National Key research and development Program of China (2021YFA0909500), Fundamental Research Funds for the Central Universities (2021XZZX018), and the National Natural Science Foundation of China Grants (32022004 and 32170078).
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Sanjit Chandra Debnath isolated the bacterium; Kejing Li performed the phenotypic and biochemical experiments, analysed the data, and drafted the manuscript; Zhenbo Ye, Gen Chen, Kaiwen Zheng, Jun Yin, Cen Yan, Yi Hong and Zhen Guo provided supports during the experiments performing and data analysis; Daoqiong Zheng, Fabai Wu and Pinmei wang designed and supervised the study and edited the original draft.
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Li, K., Ye, Z., Chen, G. et al. Atopomonas sediminilitoris sp. nov., isolated from beach sediment of Zhairuo Island, China. Antonie van Leeuwenhoek 116, 97–107 (2023). https://doi.org/10.1007/s10482-022-01780-2
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DOI: https://doi.org/10.1007/s10482-022-01780-2