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Cell-free protein synthesis (CFPS) represents a promising technology for efficient protein production targeting especially so called “difficult-to-express” proteins whose synthesis is challenging in conventional  in vivo  protein production platforms. Chinese hamster ovary (CHO) cells are one of the most prominent and safety approved cell lines for industrial protein production. In this study we demonstrated the ability to produce high yields of various protein types including membrane proteins and single chain variable fragments (scFv) in a continuous exchange cell-free (CECF) system based on CHO cell lysate that contains endogenous microsomal structures. We showed significant improvement of protein yield compared to batch formatted reactions and proved biological activity of synthesized proteins using various analysis technologies. Optimized CECF reaction conditions led to membrane protein yields up to 980 µg/ml, which is the highest protein yield reached in a microsome containing eukaryotic cell-free system presented so far.

High-yield production of “difficult-to-express” proteins in a continuous exchange cell-free system based on CHO cell lysates