The chitinase C gene PsChiC from Pseudomonas sp and its synergistic effects on larvicidal activity

文献类型： 外文期刊

第一作者： Zhong, Wanfang

作者： Zhong, Wanfang;Guo, Huifang;Zhong, Wanfang;Ding, Shaojun

作者机构：

关键词： catalytic domain;chitin-binding domain;fibronectin type-like domain;gene cloning;insecticidal activity

期刊名称：GENETICS AND MOLECULAR BIOLOGY （ 影响因子：1.771； 五年影响因子：2.584 ）

ISSN： 1415-4757

年卷期： 2015 年 38 卷 3 期

页码：

收录情况： SCI

摘要： Pseudomonas sp. strain TXG6-1, a chitinolytic gram-negative bacterium, was isolated from a vegetable field in Taixing city, Jiangsu Province, China. In this study, a Pseudomonas chitinase C gene (PsChiC) was isolated from the chromosomal DNA of this bacterium using a pair of specific primers. The PsChiC gene consisted of an open reading frame of 1443 nucleotides and encoded 480 amino acid residues with a calculated molecular mass of 51.66 kDa. The deduced PsChiC amino acid sequence lacked a signal sequence and consisted of a glycoside hydrolase family 18 catalytic domain responsible for chitinase activity, a fibronectin type III-like domain (FLD) and a C-terminal chitin-binding domain (ChBD). The amino acid sequence of PsChiC showed high sequence homology (> 95%) with chitinase C from Serratia marcescens. SDS-PAGE showed that the molecular mass of chitinase PsChiC was 52 kDa. Chitinase assays revealed that the chitobiosidase and endochitinase activities of PsChiC were 51.6-and 84.1-fold higher than those of pET30a, respectively. Although PsChiC showed little insecticidal activity towards Spodoptera litura larvae, an insecticidal assay indicated that PsChiC increased the insecticidal toxicity of SpltNPV by 1.78-fold at 192 h and hastened death. These results suggest that PsChiC from Pseudomonas sp. could be useful in improving the pathogenicity of baculoviruses.

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