title: Improving the insecticidal activity by expression of a recombinant cry1Ac gene with chitinase-encoding gene in acrystalliferous Bacillus thuringiensis.
abstract: In order to improve the insecticidal activity, the chitinase gene from tobacco (Nicotiana tabacum) endochitinase and the cry1Ac gene from Bacillus thuringiensis were cloned into the vector pHT315 and designated as pHUAccB5 plasmid. The constructed transcriptional fusion was attempted under the control of the native cry1Ac promoter. Plasmid pHUAccB5 was introduced into B. thuringiensis acrystalliferous by electroporation. Analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Western blot, the transformant XBU-HUAccB5 produced 130-kDa Cry1Ac protein and 30-kDa chitinase protein. During the chitinase active analysis, the transformant, XBU-HUAccB5 chitinase active, reached 7.5 U/mL at 72 h, and was 5 times higher than the HTX-42 and 6 times higher than the parent strains. When the insecticidal activity of the transformant was evaluated against Helicoverpa armigera Hubner, the XBU-HUAccB5 toxicity was 11.30 times higher than the transformant HTX-42 expressed single cry1Ac at 48 h and was 18.76 times higher at 72 h.
authors.affiliation: Key Lab of Microbial Molecular Biology, Hunan Normal University, Changsha 410081, PR China.
authors.forename: Xuezhi
authors.initials: X
authors.lastname: Ding
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Luo
authors.forename: Liqiu
authors.initials: L
authors.lastname: Xia
authors.forename: Bida
authors.initials: B
authors.lastname: Gao
authors.forename: Yunjun
authors.initials: Y
authors.lastname: Sun
authors.forename: Youming
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis / Q000201:enzymology / Q000235:genetics*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D002688:Chitinases / Q000235:genetics*; D018274:Electroporation; D004731:Endotoxins / Q000235:genetics* / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D005822:Genetic Vectors; D006460:Hemolysin Proteins / Q000235:genetics* / Q000378:metabolism; D009036:Moths; D010572:Pest Control, Biological; D010957:Plasmids / Q000235:genetics; D014026:Nicotiana / Q000201:enzymology / Q000235:genetics
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis; D002688:Chitinases