Abstract
Tyrosine phosphorylation is one of the major mechanisms involved in the intracellular propagation of external signals. Strategies aimed at interfering with this process might allow the control of several cellular phenotypes. SH2 domains mediate protein–protein interactions by recognizing phosphotyrosine (pY) residues in the context of specific phosphopeptides. We created an SH2-scaffolded repertoire library by randomly mutagenizing five critical amino acid positions in the specificity-determining region of the PLCγ C-terminal SH2 domain. Synthetic SH2 domains were selected from the library using biotinylated phosphopeptides derived from a natural PLCγ-SH2 ligand as well as unrelated SH2 ligands. The isolated SH2s displayed high binding affinity constants for the selecting peptides and were capable of interacting with the corresponding proteins.
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Acknowledgements
We thank Dr Pascale Romano for critically reviewing the manuscript. This work was supported by grants from Associazione Italiana Ricerca sul Cancro, from the Armenise-Harvard Foundation and from the CNR (Progetto Biotecnologie).
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Malabarba, M., Milia, E., Faretta, M. et al. A repertoire library that allows the selection of synthetic SH2s with altered binding specificities. Oncogene 20, 5186–5194 (2001). https://doi.org/10.1038/sj.onc.1204654
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DOI: https://doi.org/10.1038/sj.onc.1204654
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