Abstract
A suitable protocol for the transient expression of seed protein genes in protoplasts derived from cell suspension cultures of common bean has been established. Preliminary analyses of cultures to verify the synthesis of phaseolin - actively accumulated by the starting tissue, the developing cotyledon - showed that the protein was no longer synthesised after 5 days of culture. Transient expression of a phaseolin sequence, driven by a constitutive promoter, resulted in the accumulation of the correctly glycosylated and assembled protein. This system, when compared to tobacco protoplasts, largely avoids phaseolin fragmentation and the presence of contaminant polypeptides in the immunoprecipitates. Therefore, bean protoplasts are a good system to study the expression of wild-type as well as in-vitro-modified bean seed proteins.
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