alexa Transgenic plants for therapeutic proteins: linking upstream and downstream strategies.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Cramer CL, Boothe JG, Oishi KK

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Abstract We have described two very different and innovative plant-based production systems--postharvest production and recovery of recombinant product from tobacco leaves using an inducible promoter and oleosin-mediated recovery of recombinant product from oilseeds using a seed-specific promoter. Both base technologies are broadly applicable to numerous classes of pharmaceutical and industrial proteins. As with any emerging technology, the key to success may lie in identifying those products and applications that would most benefit from the unique advantages offered by each system. The postharvest tobacco leaf system appears effective for proteins requiring complex posttranslational processing and endomembrane targeting. Because of the remarkable fecundity and biomass production capacity of tobacco, biomass scale-up is very rapid and production costs are low. Clearly the development of equally cost-effective extraction and purification technologies will be critical for full realization of the commercial opportunities afforded by transgenic plant-based bioproduction. The recovery of protein from tobacco leaves or oleosin-partitioned proteins by oil-body separations represent significant break-throughs for cost-effective commercialization strategies. Additional low-cost, high-affinity separation technologies need to be developed for effective scale-up purification of plant-synthesized recombinant proteins. Clearly successful commercialization of plant-synthesized biopharmaceuticals must effectively link upstream strategies involving gene and protein design with downstream strategies for reproducible GMP-level recovery of bioactive recombinant protein. Both the tobacco and oilseed systems are uniquely designed to address issues of biomass storage, product recovery, quality assurance, and regulatory scrutiny in addition to issues of transgene expression and protein processing.
This article was published in Curr Top Microbiol Immunol and referenced in Journal of Vaccines & Vaccination

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