Efficient transformation and expression of the glucanase gene from Bacillus megaterium in the biocontrol strain Streptomyces lydicus A02

文献类型： 外文期刊

第一作者： Wu, Huiling

作者： Wu, Huiling;Dong, Dan;Li, Jinjin;Liu, Weicheng;Liu, Ting;Zhang, Taotao;Tian, Zhaofeng

作者机构：

关键词： glucanase;antifungal activity;Streptomyces lydicus;natamycin production

期刊名称：BIOCONTROL SCIENCE AND TECHNOLOGY （ 影响因子：1.665； 五年影响因子：1.616 ）

ISSN： 0958-3157

年卷期： 2014 年 24 卷 1 期

页码：

收录情况： SCI

摘要： Streptomyces have been used extensively as the biocontrol agents due to their ability to produce various antimicrobial compounds, such as antibiotics and hydrolytic enzymes. Streptomyces lydicus strain A02, which was isolated from the soil of suburban forest field in Beijing (China), is capable of producing natamycin and has proved to be a potential biocontrol agent to several plant fungal diseases, including wilts caused by Fusarium oxysporum f. spp. However, hydrolytic enzymes like glucanase have not been detected in S. lydicus A02 on CMC-Na plates by congo red staining. Glucanase, a pathogenesis-related (PR) protein, degrades fungal cell walls and has been widely used as antifungal agent in plant protection. Therefore, a recombinant S. lydicus expressing a glucanase gene, which was cloned from the biocontrol strain Bacillus megaterium L103 and driven by the Streptomyces erythraea ermE* promoter, was constructed in this study. The engineered S. lydicus AG02 shared a similar yield of natamycin with the wild-type A02 strain. Compared to the wild-type strain A02, the engineered S. lydicus AG02 had a remarkably higher glucanase activity, as well as antifungal activity to F. oxysporum f. sp. conglutinans, F. oxysporum f. sp. niveum and Rhizoctonia cerealis. This demonstrated the improved biocontrol effect of S. lydicus AG02 attributed to transforming the exogenous glucanase from B. megaterium, which acted synergistically with natamycin to increase the antifungal activity of the strain.

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