The cry3a gene of Bacillus thuringiensis was cloned. Based on sequence analysis of this gene, a modified gene, cry3aM, was constructed, which has the optimal codon composition for effective expression in eukaryotic cells. Hybrid genes cry3a-licBM2 and cry3aM-licBM2 were constructed, in which the sequences of the native and modified genes are fused with the reporter gene for thermostable lichenase in the reading frame. We have shown that the expression levels of hybrid genes cry3a-licBM2 and cry3aM-licBM2 in Escherichia coli are comparable, being 5% of those for reporter gene licBM2. In cells of a lower eukaryote Saccharomyces cerevisiae, the expression of hybrid gene cry3aM-licBM2, which contains the modified gene, considerably exceeded the level of expression of cry3a-licBM2 containing the native gene. The presence of lichenase in the composition of hybrid proteins was shown to facilitate selection and analysis of the expression level of hybrid proteins in transgenic organisms.
Russian Journal of Genetics – Springer Journals
Published: Mar 15, 2005
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