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Cloning, Heterologous Expression, and Functional Characterization of a Chitinase Gene, Lbchi32, from Limonium bicolor

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Abstract

In the present study, an endochitinase gene, Lbchi32, was cloned from Limonium bicolor. The cDNA sequence of Lbchi32 was 1,443 bp in length and encoded 319 amino acid residues. The DNA sequence of Lbchi32 was 2,512 bp in length and contained three exons and two introns. The Lbchi32 gene was inserted into a pPIC9 vector and transferred into Pichia pastoris strains GS115 and KM71 for heterologous expression. SDS-PAGE analyses indicated that LbCHI32 was expressed in both GS115 and KM71 and that it was secreted extracellularly. The optimal reaction conditions for LbCHI32 activity are 45°C, pH 5.0, and 5 mM Ba2+. The LbCHI32 enzyme can efficiently degrade chitin, chitin derivatives, and the cell walls of different pathogenic fungi, including phytopathogenic Rhizoctonia solani, Fusarium oxysporum, Sclerotinia sclerotiorum, Valsa sordida, Septoria tritici, and Phytophthora sojae. These findings suggest that Lbchi32 has potential use in the degradation of chitin and chitin derivatives.

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Acknowledgments

This work has been supported by Heilongjiang Province International Scientific and Technological Cooperation Project (WB07N02) and Natural Science Foundation of Heilongjiang Province (QC07C56).

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Correspondence to Yu Cheng Wang.

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Liu, Z.H., Yang, C.P., Qi, X.T. et al. Cloning, Heterologous Expression, and Functional Characterization of a Chitinase Gene, Lbchi32, from Limonium bicolor . Biochem Genet 48, 669–679 (2010). https://doi.org/10.1007/s10528-010-9348-x

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  • DOI: https://doi.org/10.1007/s10528-010-9348-x

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