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SyntheticcryIIIA gene fromBacillus thuringiensis improved for high expression in plants

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Abstract

A 1974 bp synthetic gene was constructed from chemically synthesized oligonucleotides in order to improve transgenic protein expression of thecryIIIA gene fromBacillus thuringiensis var.tenebrionis in transgenic tobacco.

The crystal toxin genes (cry) fromB. thuringiensis are difficult to express in plants even when under the control of efficient plant regulatory sequences. We identified and eliminated five classes of sequence found throughout thecryIIIA gene that mimic eukaryotic processing signals and which may be responsible for the low levels of transcription and translation. Furthermore, the GC content of the gene was raised from 36% to 49% and the codon usage was changed to be more plant-like. When the synthetic gene was placed behind the cauliflower mosaic virus 35S promoter and the alfalfa mosaic virus translational enhancer, up to 0.6% of the total protein in transgenic tobacco plants wascryIIIA as measured from immunoblot analysis. Bioassay data using potato beetle larvae confirmed this estimate.

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  1. Plant Genetic Engineering Laboratory, New Mexico State University, Box 3GL, 88003, Las Cruces, NM, USA

    Dennis W. Sutton, Patti K. Havstad & John D. Kemp

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  1. Dennis W. Sutton
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  2. Patti K. Havstad
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  3. John D. Kemp
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Sutton, D.W., Havstad, P.K. & Kemp, J.D. SyntheticcryIIIA gene fromBacillus thuringiensis improved for high expression in plants. Transgenic Research 1, 228–236 (1992). https://doi.org/10.1007/BF02524753

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  • DOI: https://doi.org/10.1007/BF02524753

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