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Molecular & Cellular Proteomics 5:533-540, 2006.
© 2006 by The American Society for Biochemistry and Molecular Biology, Inc.

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Research

Construction and Application of a Yeast Surface-displayed Human cDNA Library to Identify Post-translational Modification-dependent Protein-Protein Interactions ^*

Scott Bidlingmaier and Bin Liu

From the Department of Anesthesia and UCSF Comprehensive Cancer Center, University of California, San Francisco, California 94110

Although post-translational modifications such as phosphorylation mediate fundamental biological processes within the cell, relatively few methods exist that allow proteome-wide identification of proteins that interact with these modifications. We constructed a yeast surface-displayed human cDNA library and utilized it to identify protein fragments with affinity for phosphorylated peptides derived from the major tyrosine autophosphorylation sites of the epidermal growth factor receptor or focal adhesion kinase. We identified cDNAs encoding the Src homology 2 domains from adapter protein APS, phosphoinositide 3-kinase regulatory subunit 3, SH2B, and tensin, demonstrating the effectiveness of this approach. Our results suggest that large libraries of functional human protein fragments can be efficiently displayed on the yeast surface. In addition to the analysis of post-translational modifications, yeast surface-displayed human cDNA libraries have many potential applications, including identifying targets and defining potential cross-reactive proteins for small molecules or drugs.

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