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- W2060664009 abstract "Four non-inhibitory specific single-chain Fv (sc Fv) fragments directed against L-asparaginase (ASNase) of Escherichia coli were selected from a synthetic phage-display scFv library. The scFv46 fragment could enhance the resistance of ASNase to trypsin proteolysis, with 70% of the initial ASNase activity present after the ASNase-scFv46 complex had been treated with trypsin for 30 min at 37 degrees C, whereas little residual activity was detected without the scFv46 fragment. The scFv46 gene was cloned to an expression vector pET-21a and expressed at high levels (about 45% of total cell protein) in E. coli BL21 (DE3) as inclusion bodies. The refolded and purified scFv46 fragment was proved to protect ASNase, and the protective effect was further confirmed by SDS/PAGE. It was found that under optimum conditions of molar ratio of scFv to ASNase, incubation time and temperature, the residual activity of the ASNase-scFv46 complex could reach about 78% after treatment with trypsin for 30 min at 37 degrees C. The results demonstrated that scFv fragments prepared by phage-antibody library technology could be used to protect target proteins." @default.
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- W2060664009 date "2000-02-01" @default.
- W2060664009 modified "2023-09-24" @default.
- W2060664009 title "Selecting and expressing protective single-chain Fv fragment to stabilize L-asparaginase against inactivation by trypsin" @default.
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- W2060664009 doi "https://doi.org/10.1042/ba19990062" @default.
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