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Antifungal chitinases from Bacillus pumilus SG2: preliminary report

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Abstract

A halotolerant bacterium capable of chitinase production was previously isolated from saline soils of Gavkhooni marsh, Iran. The strain was identified as Bacillus pumilus strain SG2. This strain secretes two chitinases into the medium in response to the presence of chitin in the medium. The two chitinases, ChiS and ChiL, were active on both polymeric as well as oligosaccharide substrates. In this study, these two extracellular chitinases were purified from the supernatant of the Bacillus culture by ammonium sulfate precipitation. The optimum pH and temperature for both of these chitinases were pH 6 and 37°C, respectively. According to the conserved domain analysis, ChiS and ChiL were categorized in family 18 of the glycosylhydrolases. Three essential conserved amino acid residues (Asp-194, Asp-196 and Glu-198) in ChiS and (Asp-228, Asp-230 and Glu-232) in ChiL were found within the active site. Antifungal activities of the two purified chitinases were assessed on Rhizoctonia solani, Verticillium sp., Nigrospora sp., Stemphyllium botryosum and Bipolaris sp. demonstrating inhibition of all the tested strains. However, these chitinases did not inhibit cell wall formation of the non-chitin-containing fungi (oomycetes) Phytophthora citricola and Phytophthora capsici. This is the first investigation demonstrating antifungal activity of chitinases purified from B. pumilus SG2.

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Acknowledgments

The authors would like to thank the International Center for Genetics Engineering and Biotechnology (ICGEB, Italy) and National Institute of Genetic Engineering and Biotechnology (NIGEB, Iran) for providing financial support.

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Correspondence to Gholamreza Ahmadian.

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Ghasemi, S., Ahmadian, G., Jelodar, N.B. et al. Antifungal chitinases from Bacillus pumilus SG2: preliminary report. World J Microbiol Biotechnol 26, 1437–1443 (2010). https://doi.org/10.1007/s11274-010-0318-6

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  • DOI: https://doi.org/10.1007/s11274-010-0318-6

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