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Updated: Aug 16, 2026
Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain
Published on: December 12, 2017
Efficient recovery of the functional IP10-scFv fusion protein from inclusion bodies with an on-column refolding
Jun-Qing Guo1, Qing-Mei Li, Ji-Yong Zhou
1Institute of Preventive Veterinary Medicine, Zhejiang University, Hangzhou 310029, China.
Abstract:
A functional IP10-scFv fusion protein retaining the antibody specificity for acidic isoferritin and chemokine function was produced at high level in Esherichia coli (E. coli). IP10-scFv gene from the recombinant plasmid pc3IP104c9 was subcloned into pET28a fused to N-terminal His-tag sequence in frame and overexpressed in E. coli BL21(DE3). With an on-column refolding procedure based on Ni-chelating chromatography, the active fusion protein was recovered efficiently from inclusion bodies with a refolding yield of approximate 45% confirmed by spectrophotometer. The activity of refolded IP10-scFv was determined through sodium dodecyl sulfate-polyacrylamide gel electrophoresis, Western blotting and enzyme-linked immunosorbent assay. The results showed the fusion protein retains the specific binding activity to AIF with an affinity constant of 4.48x10(-8) M as well as the chemokine function of IP-10. The overall yield of IP10-scFv with bioactivity in E. coli flask culture was more than 40 mg/L.
