Shu C, Zhang J, Chen G, Liang G, He K, Crickmore N, Huang D, Zhang J, Song F. Use of a pooled clone method to isolate a novel Bacillus thuringiensis Cry2A toxin with activity against Ostrinia furnacalis.
J Invertebr Pathol 2013;
114:31-3. [PMID:
23711413 DOI:
10.1016/j.jip.2013.05.005]
[Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 04/26/2013] [Accepted: 05/16/2013] [Indexed: 12/26/2022]
Abstract
A pooled clone method was developed to screen for cry2A genes. This metagenomic method avoids the need to analyse isolated Bacillus thuringiensis strains by performing gene specific PCR on plasmid-enriched DNA prepared from a pooled soil sample. Using this approach the novel holotype gene cry2Ah1 was cloned and characterized. The toxin gene was over-expressed in Escherichia coli Rosetta (DE3) and the expressed toxin accumulated in both the soluble and insoluble fractions. The soluble Cry2Ah1 was found to have a weight loss activity against Ostrinia furnacalis, and a growth inhibitory activity to both Cry1Ac-susceptible and resistant Helicoverpa armigera populations.
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