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Fab is the most efficient format to express functional antibodies by yeast surface display

Abstract : Multiple formats are available for engineering of monoclonal antibodies (mAbs) by yeast surface display, but they do not all lead to efficient expression of functional molecules. We therefore expressed four anti-tumor necrosis factor and two anti-IpaD mAbs as single-chain variable fragment (scFv), antigen-binding fragment (Fab) or single-chain Fabs and compared their expression levels and antigen-binding efficiency. Although the scFv and scFab formats are widely used in the literature, 2 of 6 antibodies were either not or weakly expressed. In contrast, all 6 antibodies expressed as Fab revealed strong binding and high affinity, comparable to that of the soluble form. We also demonstrated that the variations in expression did not affect Fab functionality and were due to variations in light chain display and not to misfolded dimers. Our results suggest that Fab is the most versatile format for the engineering of mAbs.
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Submitted on : Monday, April 15, 2019 - 2:42:28 PM
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Coline Sivelle, Raphaël Sierocki, Kelly Ferreira-Pinto, Stéphanie Simon, Bernard Maillère, et al.. Fab is the most efficient format to express functional antibodies by yeast surface display. mAbs, Taylor & Francis, 2018, 10 (5), pp.720-729. ⟨10.1080/19420862.2018.1468952⟩. ⟨cea-02100007⟩

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