Characteristics and Function of the Chitin Binding Protein from Xenorhabdus nematophila

Author(s): Jia Liu, Ping Song, Jie Zhang, Ziyan Nangong, Xiaobei Liu, Yue Gao, Qinying Wang*.

Journal Name: Protein & Peptide Letters

Volume 26 , Issue 6 , 2019

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Graphical Abstract:


Background: Genome sequence analysis (GenBank access No.: FN667742.1) shows that Xenorhabdus nematophila ATCC19061 contains one gene (Xn-cbp) encoding chitin binding protein (Xn-CBP).

Objective: The present work aims to clarify the characteristics and function of Xn-CBP from X. nematophila HB310.

Methods: In this study, the Xn-cbp gene was cloned and expressed in Escherichia coli BL21 (DE3). Substrate binding assays were performed to explain the ability of Xn-CBP combined with the polysaccharide. The insecticidal toxicity of Xn-CBP against the second-instar larvae of Helicoverpa armigera was determined by feeding method. Besides, the antifungal activity of Xn-CBP against Coniothyrium diplodiella, Verticillium dahlia, and Fusarium oxysporum was tested by spore germination assay and hyphal extension assay.

Results: Xn-CBP encoded 199 amino acids with a calculated mass of 28 kDa, which contained a signal peptide and a chitin binding domain. The Bmax and Kd values of Xn-CBP to colloidal chitin were 2.46 and 4.08, respectively. Xn-CBP had insecticidal activity against the H. armigera with a growth inhibition rate of 84.08%. Xn-CBP had the highest spore germination inhibitory effect on C. diplodiella with the inhibition rate of 83.11%. The hyphal growth inhibition rate of Xn-CBP to F. oxysporum, 41.52%, was higher than the other two fungi.

Conclusion: The Xn-CBP had the highest binding ability to colloidal chitin and it showed insecticidal activity and antifungal activity. The present study laid a foundation for further exploitation and utilization of X. nematophila.

Keywords: Antifungal activity, chitin binding protein, insecticidal activity, substrate binding, Xenorhabdus nematophila, spore germination.

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Year: 2019
Page: [414 - 422]
Pages: 9
DOI: 10.2174/0929866526666190327143335
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