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        A Novel Plant Cell Bioproduction Platform for High-Yield Secretion of Recombinant Proteins

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        Plant cell suspension culture integrates the merits of whole-plant systems with those of microbial fermentation and mammalian cell culture, and has been recognized as a promising alternative biosynthetic platform for valuable proteins. However, the low protein productivity dilemma has been the bottleneck toward commercializing this technology. Here, we describe a new technology, termed hydroxyproline (Hyp )-Glyco technology, that dramatically increases the yield of secreted recombinant proteins from cultured plant cells by expressing them as fusions with a novel glycomodule tag comprising an Hyp-rich repetitive peptide (HypRP) backbone that is subsequently glycosylated through the Hyp residues. The extensive glycosylation of the HypRP tags greatly extends the serum half-life of small therapeutic proteins, such as interferon α2b or human growth hormone, without significantly impairing their bioactivities and the tag greatly enhances solubility.
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