Abstract
Besides classical antibodies with the composition of heavy and light chains, sharks produce a unique heavy chain only isotype, termed Immunoglobulin New Antigen Receptor (IgNAR), in which antigen binding is solely mediated by a single domain, referred to as vNAR. Owing to their high affinity and specificity combined with their small size and high stability, vNAR domains emerged as promising target-binding scaffolds that can be tailor-made for biotechnological and biomedical applications. Herein, we describe protocols for the construction of semi-synthetic, CDR3-randomized vNAR libraries for the isolation of target-specific antibodies using yeast surface display or phage display as platform technology. Additionally, we provide information for affinity maturation of target-specific molecules through CDR1 diversification and sublibrary establishment.
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