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Phylogenetic analysis and screening of antimicrobial and cytotoxic activities of moderately halophilic bacteria isolated from the Weihai Solar Saltern (China)

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Abstract

A total of 45 moderately halophilic bacteria was isolated from sediment and saline water collected from the Weihai Solar Saltern (China). The phylogenetic position of all the isolated strains was determined by 16S rRNA sequencing. The halophilic strains were tested for their antimicrobial activity. Cytotoxicity assay was performed to determine which of the halophilic strains could inhibit proliferation of human hepatocellular carcinoma Bel 7402 cells. Our results showed that all of the isolated 45 strains displayed moderately halophilic characteristics. Phylogenetic analysis indicated that 17 of the isolated strains were related to the phylum Firmicutes and belonged to four genera, Bacillus, Halobacillus, Planococcus and Salinicoccus. The other strains identified as genus of Halomonas belonged to phylum γ-Proteobacteria. Most of the halophilic bacterial strains showed potent activities against Gram-positive bacteria, human pathogenic fungi and plant pathogenic fungi. In addition, the crude extracts from 14 halophilic bacterial strains showed cytotoxic activity against tumor cells Bel 7402, and five of them showed remarkable activities with IC50 less than 40 μg ml−1. Our results suggest that the moderately halophilic bacteria may be developed as promising sources for the discovery of novel bioactive substances.

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Acknowledgments

This work was supported by the National High Technology Research and Development Program of China (863 Program) (Grants No. 2007AA091403 and No. 2007AA09Z408) from the Ministry of Science and Technology (MOST) of the People’s Republic of China.

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Authors and Affiliations

  1. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, 266071, Qingdao, People’s Republic of China

    Lei Chen, Tong Bu, Ming Liu & Xiukun Lin

  2. College of Marine Science, Harbin Institute of Technology at Weihai, 264209, Weihai, People’s Republic of China

    Lei Chen, Guangyu Wang & Yunbin Zhang

  3. Graduate School, Chinese Academy of Sciences, 100039, Beijing, People’s Republic of China

    Lei Chen & Tong Bu

  4. College of Marine Life Sciences, Ocean University of China, 266003, Qingdao, People’s Republic of China

    Yixin Wang

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  1. Lei Chen
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Correspondence to Xiukun Lin.

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Chen, L., Wang, G., Bu, T. et al. Phylogenetic analysis and screening of antimicrobial and cytotoxic activities of moderately halophilic bacteria isolated from the Weihai Solar Saltern (China). World J Microbiol Biotechnol 26, 879–888 (2010). https://doi.org/10.1007/s11274-009-0247-4

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  • DOI: https://doi.org/10.1007/s11274-009-0247-4

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