title: Heterologous coexpression of Vitreoscilla hemoglobin and Bacillus megaterium glucanase in Streptomyces lydicus A02 enhanced its production of antifungal metabolites.
abstract: 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 bglC encoding Bacillus megaterium L103 glucanase, both under the control of the strong constitutive ermE* promoter, in S. lydicus A02. Our results showed that coexpressing VHb and glucanase improved cell growth, and the engineered strain produced 26.90% more biomass than the wild-type strain after 72h 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.
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
authors.forename: Huiling
authors.initials: H
authors.lastname: Wu
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
authors.forename: Jinjin
authors.initials: J
authors.lastname: Li
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Dong
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Liu
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
authors.forename: Taotao
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
authors.forename: Dianpeng
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China. Electronic address: liuwich@163.com.
authors.forename: Weicheng
authors.initials: W
authors.lastname: Liu
mesh_terms: D000935:Antifungal Agents / Q000378:metabolism* / Q000494:pharmacology; D001410:Bacillus megaterium / Q000201:enzymology* / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D005285:Fermentation; D005670:Fusarium / Q000187:drug effects; D005818:Genetic Engineering; D006026:Glycoside Hydrolases / Q000235:genetics / Q000378:metabolism*; D007218:Industrial Microbiology; D010866:Natamycin / Q000096:biosynthesis; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D013302:Streptomyces / Q000235:genetics / Q000378:metabolism*; D054793:Truncated Hemoglobins / Q000235:genetics / Q000378:metabolism*; D020589:Vitreoscilla / Q000235:genetics / Q000378:metabolism*
chemical_list: D000935:Antifungal Agents; D001426:Bacterial Proteins; D011994:Recombinant Proteins; D054793:Truncated Hemoglobins; C082613:hemoglobin protein, Vitreoscilla; D010866:Natamycin; D006026:Glycoside Hydrolases
keywords: Antifungal activity; Chitinase; Coexpression; Glucanase; Natamycin; Vitreoscilla hemoglobin