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Cloning, expression and activity of cry1Ia gene from Bacillus thuringiensis isolate

Published online by Cambridge University Press:  27 June 2008

Dou Li-Ming
Affiliation:
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China College of Agriculture, Northeast Agricultural University, Harbin 150030, China
Han Lan-Lan
Affiliation:
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China College of Agriculture, Northeast Agricultural University, Harbin 150030, China
Zhang Jie
Affiliation:
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China
He Kang-lai
Affiliation:
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China
Zhao Kui-Jun
Affiliation:
College of Agriculture, Northeast Agricultural University, Harbin 150030, China
Huang Da-Fang
Affiliation:
Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Song Fu-Ping*
Affiliation:
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China
*
*Corresponding author. E-mail: [email protected]

Abstract

A full-length cry1Ia gene fragment, obtained by polymerase chain reaction (PCR) amplification with a pair of primers designed according to cry1Ia-type gene sequences and DNA from Bacillus thuringiensis as template, was introduced into the expression vector pET-21b and transformed into Escherichia coli BL21(DE3). The molecular weight of the induced expression product was 81.2 kDa. The amino acid sequence of Cry1Ia was very different from sequences of 12 known Cry1Ia-type proteins. This gene was designated as cry1Ia8 by the International B. thuringiensis Insecticidal Protein Nomenclature Committee (accession number AF373207). The bioassay results indicated that Cry1Ia toxin protein showed distinct insecticidal activity against Ostrinia furnacalis and Plutella xylostella with LC50 of 0.268 μg/g and 2.227 μg/ml, respectively. It also had insecticidal activity against Leguminivora glycinivorella, but not against Pyrrhalta aenescens. The novel cry1Ia8 gene will be an important resource in constructing genetically engineered bacteria and transgenic plants for biocontrol of insect pests. It is also available for screening gene stacks to delay pest resistance.

Type
Research Papers
Copyright
Copyright © China Agricultural University 2008

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Footnotes

First published in Journal of Agricultural Biotechnology 2007, 15(6): 1053–1057

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