Summary
Combinatorial libraries have yielded high-affinity ligands for SH3 domains of a number of different proteins. We have shown that synthetic peptides containing these SH3 ligand sequences serve as specific probes of SH3 domains. Direct binding of the N-terminal biotinylated peptide ligands was conveniently detected in ELISA, filter-blotting, and dot-blotting experiments with the use of streptavidin-conjugated enzymes. In some cases, detection of peptide-SH3 interactions required that the biotinylated peptides first were preconjugated with streptavidin to form a multivalent complex. Interestingly, these nominally tetravalent SH3 peptide ligands cross-react to varying degrees with different SH3 domains. We have used such complexes to screen λcDNA expression libraries and have isolated clones that encode both known and novel SH3-domain-containing proteins. Based on the success of this methodology, we propose a general strategy by which ligands of a modular domain-containing protein can be isolated from random peptide libraries and used to screen cDNA expression libraries systematically for novel modular domain-containing proteins.
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Hoffman, N.G., Sparks, A.B., Carter, J.M. et al. Binding properties of SH3 peptide ligands identified from phage-displayed random peptide libraries. Mol Divers 2, 5–12 (1996). https://doi.org/10.1007/BF01718694
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DOI: https://doi.org/10.1007/BF01718694