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Updated: Jul 29, 2026
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Transient Expression and Cellular Localization of Recombinant Proteins in Cultured Insect Cells
Published on: April 20, 2017
Modification of the coding sequence enhances plant expression of insect control protein genes
F J Perlak1, R L Fuchs, D A Dean
1Plant Sciences, Monsanto Company, Chesterfield, MO 63198.
Summary
Genetically modified plants expressing Bacillus thuringiensis insect control proteins show improved resistance. Modifying the cryIA(b) gene significantly boosted protein levels and insect control efficacy in tobacco and tomato plants.
Area of Science:
- Plant biotechnology
- Molecular biology
- Entomology
Background:
- Bacillus thuringiensis (Bt) insect control proteins are crucial for developing insect-resistant genetically modified (GM) plants.
- Optimizing the expression of Bt genes in plants is essential for achieving agronomically useful insect resistance.
Purpose of the Study:
- To evaluate the impact of nucleotide modifications in cryIA(b) and cryIA(c) genes on insect control protein expression in tobacco and tomato.
- To identify specific DNA sequences responsible for enhanced gene expression in plants.
Main Methods:
- Comparison of wild-type cryIA(b) gene expression with partially and fully modified versions in transgenic tobacco and tomato.
- Analysis of modified cryIA(b) gene sequences to pinpoint regions affecting plant expression.
- Quantification of insect control protein levels and mRNA in transformed plants.
Main Results:
- Modified cryIA(b) and cryIA(c) genes significantly increased the frequency of plants with sufficient insect control protein levels.
- Partially and fully modified cryIA(b) genes resulted in 10-fold and 100-fold higher protein levels, respectively, compared to the wild-type gene.
- A specific DNA region in the modified cryIA(b) gene was identified as critical for improving plant expression, enhancing translational efficiency.
Conclusions:
- Nucleotide sequence modifications can dramatically enhance the expression of Bacillus thuringiensis insect control proteins in plants.
- These modifications lead to higher protein accumulation and improved insect resistance in genetically modified crops.
- Targeted sequence optimization is a key strategy for advancing plant biotechnology and crop protection.
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