Abstract
Two Gram-stain-negative, aerobic, non-motile, and rod-shaped bacterial strains, designated SM1352T and A20T, were isolated from intertidal sediments collected from King George Island, Antarctic. They shared 99.8% 16S rRNA gene sequence similarity with each other and had the highest sequence similarity of 98.1% to type strain of Aureibaculum marinum but < 93.4% sequence similarity to those of other known bacterial species. The genomes of strains SM1352T and A20T consisted of 5,108,092 bp and 4,772,071 bp, respectively, with the G + C contents both being 32.0%. They respectively encoded 4360 (including 37 tRNAs and 6 rRNAs) and 4032 (including 36 tRNAs and 5 rRNAs) genes. In the phylogenetic trees based on 16S rRNA gene and single-copy orthologous clusters (OCs), both strains clustered with Aureibaculum marinum and together formed a separate branch within the family Flavobacteriaceae. The ANI and DDH values between the two strains and Aureibaculum marinum BH-SD17T were all below the thresholds for species delineation. The major cellular fatty acids (> 10%) of the two strains included iso-C15:0, iso-C15:1 G, iso-C17:0 3-OH. Their polar lipids predominantly included phosphatidylethanolamine, one unidentified aminophospholipid, one unidentified aminolipid, and two unidentified lipids. Genomic comparison revealed that both strains possessed much more glycoside hydrolases and sulfatase-rich polysaccharide utilization loci (PULs) than Aureibaculum marinum BH-SD17T. Based on the above polyphasic evidences, strains SM1352T and A20T represent two novel species within the genus Aureibaculum, for which the names Aureibaculum luteum sp. nov. and Aureibaculum flavum sp. nov. are proposed. The type strains are SM1352T (= CCTCC AB 2014243 T = JCM 30335 T) and A20T (= CCTCC AB 2020370 T = KCTC 82503 T), respectively.
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Acknowledgements
We sincerely thank **g-yao Qu, **g Zhu and Zhi-feng Li from State Key Laboratory of Microbial Technology of Shandong University for help and guidance in LC-MS.
Funding
This work was supported by the National Key Research and Development Program of China (grants 2018YFC1406700, 2018YFC1406704, and 2018YFC0310704), the National Science Foundation of China (grants 91851205, 31630012, and 42076151), Major Scientific and Technological Innovation Project (MSTIP) of Shandong Province (2019JZZY010817), the Program of Shandong for Taishan Scholars (tspd20181203). Persons employed by the funders had no role in the study or in the preparation of the article or decision to publish.
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**-ying Zhang designed the work. **ao-yan He, Chao-yi Lin, Ning-hua Liu and **-ying Zhang performed experiments, collected and analysed data. **ao-yan He, Yu-qiang Zhang and **-ying Zhang drafted the manuscript. **-ying Zhang, Mei-ling Sun, **u-lan Chen and Yu-zhong Zhang interpreted some data and revised the manuscript. All authors read and approved the final manuscript.
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He, Xy., Liu, Nh., Lin, Cy. et al. Description of Aureibaculum luteum sp. nov. and Aureibaculum flavum sp. nov. isolated from Antarctic intertidal sediments. Antonie van Leeuwenhoek 115, 391–405 (2022). https://doi.org/10.1007/s10482-021-01702-8
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DOI: https://doi.org/10.1007/s10482-021-01702-8