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. 1990 Aug;87(16):6378–6382. doi: 10.1073/pnas.87.16.6378

Peptides on phage: a vast library of peptides for identifying ligands.

S E Cwirla 1, E A Peters 1, R W Barrett 1, W J Dower 1
PMCID: PMC54537  PMID: 2201029

Abstract

We have constructed a vast library of peptides for finding compounds that bind to antibodies and other receptors. Millions of different hexapeptides were expressed at the N terminus of the adsorption protein (pIII) of fd phage. The vector fAFF1, derived from the tetracycline resistance-transducing vector fd-tet, allows cloning of oligonucleotides in a variety of locations in the 5' region of gene III. A library of 3 x 10(8) recombinants was generated by cloning randomly synthesized oligonucleotides. The library was screened for high-avidity binding to a monoclonal antibody (3-E7) that is specific for the N terminus of beta-endorphin (Tyr-Gly-Gly-Phe). Fifty-one clones selected by three rounds of the affinity purification technique called panning were sequenced and found to differ from previously known ligands for this antibody. The striking finding is that all 51 contained tyrosine as the N-terminal residue and that 48 contained glycine as the second residue. The binding affinities of six chemically synthesized hexapeptides from this set range from 0.35 microM (Tyr-Gly-Phe-Trp-Gly-Met) to 8.3 microM (Tyr-Ala-Gly-Phe-Ala-Gln), compared with 7.1 nM for a known high-affinity ligand (Tyr-Gly-Gly-Phe-Leu). These results show that ligands can be identified with no prior information concerning antibody specificity. Peptide libraries are also likely to be useful in finding ligands that bind to other classes of receptors and in discovering pharmacologic agents.

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