Heterologous coexpression of Vitreoscilla hemoglobin and Bacillus megaterium glucanase in Streptomyces lydicus A02 enhanced its production of antifungal metabolites

文献类型: 外文期刊

第一作者: Wu, Huiling

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

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关键词: Vitreoscilla hemoglobin;Glucanase;Coexpression;Natamycin;Antifungal activity;Chitinase

期刊名称:ENZYME AND MICROBIAL TECHNOLOGY ( 影响因子:3.493; 五年影响因子:3.699 )

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收录情况: SCI

摘要: Streptomyces lydicus A02 is a novel producer of commercially important polyene macrocyclic antibiotic natamycin and a potential biocontrol agent to several plant fungal diseases, including wilt caused by Fusarium oxysporum f. spp. To improve the natamycin production and the antifungal activity of S. lydicus A02, we coexpressed gene vgb encoding Vitreoscilla hemoglobin (VHb) and bgiC encoding Bacillus megaterium L103 glucanase, both under the control of the strong constitutive ermE* promoter, in S. lydicus A02. Our results showed that coexpressingVHb and glucanase improved cell growth, and the engineered strain produced 26.90% more biomass than the wild-type strain after 72 h fermentation in YSG medium. In addition, coexpressing genes encoding VHb. and glucanase led to increased natamycin production, higher endogenous chitinase activity and exogenous glucanase activity, as well as enhanced antifungal activity in the engineered S. lydicus AVG02 and AGV02, regardless of the position of the two genes on the plasmids. Compared with model strains, few reports have successfully coexpressed VHb and other foreign proteins in industrial strains. Our results illustrated an effective approach for improving antifungal activity in an industrial strain by the rational engineering of combined favorable factors. (C) 2015 Elsevier Inc. All rights reserved.

分类号: Q5

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