Construction of human nonimmune library and selection of scFvs against IL-33

Applied Biochemistry and Biotechnology
Qing YuanSiji Nian

Abstract

Interleukin (IL) 33 plays very important roles in inflammatory and allergic diseases. To select human single-chain Fv fragments (scFvs) against IL-33, a nonimmune phage library system was constructed. The full-length cDNA library was synthesized for amplification of the variable heavy chain (V(H)) and variable light chain (V(L)). By overlapping extension PCR for splicing V(H) and V(L), the full-length scFv library DNA were amplified and then transformed into Escherichia coli TG1. The scFv library was constructed successfully which contained 2.5×10(8) independent clones with full-length scFv inserts. The results of fingerprint maps of the scFvs by BstN I and DNA sequencing from the library at random proved that the library was diverse. The human IL-33 was amplified, expressed, and purified. The purified IL-33 with bioactivity was biotinylated and used as antigen for selection of scFv library by phage display. After three rounds of affinity selection, about 30 % of clones have specific binding activity with IL-33. Five of those with good binding activity were transformed into E. coli strain HB2151 for soluble expression. The selected scFvs were further identified by western blot and sequencing. Those selected scFvs could be used ...Continue Reading

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Citations

Jun 27, 2015·Protein Expression and Purification·Yingchun YeQing Yuan
Jan 23, 2018·Archives of Virology·Jeeraphong ThanongsaksrikulWanpen Chaicumpa
Jan 25, 2020·Molecular Medicine Reports·Qi ChenQing Yuan
Jan 5, 2021·Frontiers in Oncology·Guang-Quan LiangHenry Wei

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