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- W4200434250 abstract "To generate stable cell lines that express high levels of recombinant genes often requires screening of a large number of transfected cells using ELISA. The most widely used alternative to ELISA screening is to use an intracellularly expressed GFP reporter construct which allows sorting of recombinant gene expression cells based on GFP fluorescence intensity. The disadvantage of cell sorting, however, is that the resulting population will be polyclonal with the danger of instability and overgrowth of low producers. In addition, GFP or its variants can be toxic to host cells at high concentrations, and thus may reduce growth and robustness of high producer cells or even cause them to become apoptotic. We have developed a new mammalian expression system in which a recombinant protein and a fluorescence protein, AcGFP1, are expressed on the same plasmid separated by an internal ribosome entry site (IRES). A signal peptide was incorporated upstream of AcGFP1 so that the fluorescent protein is secreted from cells, preventing cellular toxicity from intracellular accumulation and enabling convenient and accurate measurement of the protein. Expression tests of Ebola viral envelope GP1 and HIV gp120 proteins using this expression system in 293-H cells showed recombinant protein expression levels were closely correlated with AcGFP1 yield. Therefore, AcGFP1 can serve as an accurate reporter for recombinant protein expression and measuring AcGFP1 concentration provides a convenient, product independent and universal way for efficient clone screening." @default.
- W4200434250 created "2021-12-31" @default.
- W4200434250 creator A5010419594 @default.
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- W4200434250 date "2022-04-01" @default.
- W4200434250 modified "2023-10-13" @default.
- W4200434250 title "Developing a secretory AcGFP1-based IRES expression system for efficient production of mammalian recombinant proteins" @default.
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- W4200434250 doi "https://doi.org/10.1016/j.pep.2021.106029" @default.
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