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Surface plasmon resonance (SPR) based binding studies of refolded single chain antibody fragments.
Biochemistry and Biophysics Reports 2018 July
Recent advances in Recombinant antibody technology / Antibody Engineering has given impetus to the genetic manipulation of antibody fragments that has paved the way for better understanding of the structure and functions of immunoglobulins and also has escalated their use in immunotherapy. Bacterial expression system such as Escherichia coli has complemented this technique through the expression of recombinant antibodies. Present communication has attempted to optimize the expression and refolding protocol of single chain fragment variable (ScFv) and single chain antigen binding fragment (ScFab) using E.coli expression system. Efficiency of refolding protocol was validated by structural analysis by CD, native folding by fluorescence and functional analysis by its binding with full length HIV-1 gp120 via SPR. Results show the predominant β-sheet (CD) as secondary structural content and native folding via red shift (tryptophan fluorescence). The single chain fragments have shown good binding with HIV-1 gp120 thus validating the expression and refolding strategy and also reinstating E.coli as model expression system for recombinant antibody engineering. SPR based binding analysis coupled with E.coli based expression and purification will have implication for HIV therapeutics and will set a benchmark for future studies of similar kind.
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