Abstract
We characterized a phage antibody in which an Fv fragment, namely, a free VH fragment noncovalently associated with a VL fragment that is fused with a truncated cpIII molecule (VL-DeltacpIII), is expressed on the phage surface. D1.3 antibody specific for hen egg-white lysozyme was used as a model system. Both VH and VL-DeltacpIII fragments were stably expressed and associated with each other to form a faithful antigen-binding site. The results of Western blotting indicated that more than 5% of phages expressed the Fv fragment on their surface. Analysis of the kinetics of binding of the phage antibody to the antigen suggested the possibility of presence of phages having multiple-binding sites on a single phage particle.
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