Abstract
Peptides interacting with the Fc portion of human IgG (IgG Fc) were selected from a phage display decapeptide library. The library was selected five times and interacting phage peptides were eluted either with Staphylococcal protein A or at low pH. Individual peptide phage clones were found to interact more strongly with IgG Fc than did either the original library or the wild-type phage. Increasing concentrations of protein A could competitively reduce the interaction of a peptide phage clone (FARLVSSIRY) eluted with protein A to the same level as the original library. Furthermore, when immunoglobulins from chicken, donkey, human, mouse, swine, rabbit, and sheep were included, peptide phage clones FGRLVSSIRY and TWKTSRISIF interacted strongly with human IgG Fc and porcine IgG and weakly with the immunoglobulins obtained from the other species.
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