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Phage display has been instrumental for the success of antibody (Ab) technology. The aim of the present study was to explore phage display of soluble T-cell receptors (TCRs). A library platform that supports engineering and selection of improved TCRs to be used as detection reagents for specific antigen presentation will be very useful. In such applications, high, equal and clone independent display levels are a prerequisite for ‘fair’ selection. Therefore, we explored how different pIII fusion formats and modes affected the display levels of two murine α/β TCRs. Both are derived from T-cell clones associated with the MOPC315 myeloma model. The results show that the design of the pIII fusion particle significantly affects the subsequent display levels. Furthermore, successful display may be obtained both in phagemid and phage versions. Importantly, improvement of poor display can be achieved by over-expressing the periplasmic chaperone FkpA.

Functional phage display of two murine α/β T-cell receptors is strongly dependent on fusion format, mode and periplasmic folding assistance