Abstract
As a first example of the feasibility of producing industrial bulk enzymes in plants, we have expressed Bacillus licheniformis α-amylase in transgenic tobacco, and applied the seeds directly in starch liquification. The enzyme was properly secreted into the intercellular space, and maximum expression levels of about 0.3% of total soluble protein were obtained. No apparent effect of the presence of the enzyme on plant phenotype was observed. The molecular weight of the enzyme produced in tobacco was around 64 kD. The difference, compared to 55.2 kD for the bacterial enzyme, was found to result from complex-type carbohydrate chains attached to the protein. Application studies on the liquefaction of starch were done with transgenic seeds containing the re-combinant α-amylase. The resulting hydrolysis products were virtually identical with those obtained from degradation with α-amylase from Bacillus licheniformis.
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Pen, J., Molendijk, L., Quax, W. et al. Production of Active Bacillus licheniformis Alpha-Amylase in Tobacco and its Application in Starch Liquefaction. Nat Biotechnol 10, 292–296 (1992). https://doi.org/10.1038/nbt0392-292
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DOI: https://doi.org/10.1038/nbt0392-292
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