Abstract
Herein, we describe a general protocol for the selection of target-binding affinity protein molecules from a phagemid-encoded library. The protocol is based on our experience with phage display selections of non-immunoglobulin affibody affinity proteins but can in principle be applied to perform biopanning experiments from any phage-displayed affinity protein library available in a similar phagemid vector. The procedure begins with an amplification of the library from frozen bacterial glycerol stocks via cultivation and helper phage superinfection, followed by a step-by-step instruction of target protein preparation, selection cycles, and post-selection analyses. The described procedures in this standard protocol are relatively conservative and rely on ordinary reagents and equipment available in most molecular biology laboratories.
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