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* Department of Pharmacology, University of Wisconsin-Madison, Madison, Wisconsin 53706-1532, USA;
Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom;
Department of Biochemistry and Molecular Biology, Mount Sinai School of Medicine, New York, New York 10029-6574, USA
1Correspondence: Department of Pharmacology, University of Wisconsin, 1300 University Ave., Madison, WI 53706-1532, USA. E-mail: bkkay{at}facstaff.wisc.edu
Acommon focus among molecular and cellular biologists is the identification of proteins that interact with each other. Yeast two-hybrid, cDNA expression library screening, and coimmunoprecipitation experiments are powerful methods for identifying novel proteins that bind to ones favorite protein for the purpose of learning more regarding its cellular function. These same techniques, coupled with truncation and mutagenesis experiments, have been used to define the region of interaction between pairs of proteins. One conclusion from this work is that many interactions occur over short regions, often less than 10 amino acids in length within one protein. For example, mapping studies and 3-dimensional analyses of antigenantibody interactions have revealed that epitopes are typically 47 residues long (1) . Other examples include protein-interaction modules, such as Src homology (SH) 2 and 3 domains, phosphotyrosine binding domains (PTB), postsynaptic density/disc-large/ZO1 (PDZ) domains, WW domains, Eps15 homology (EH) domains, and 143-3 proteins that typically recognize linear regions of 39 amino acids. Each of these domains has been the subject of recent reviews published elsewhere (2 3 4 5 6 7) . Among the primary structures of many ligands for proteinprotein interactions, the amino acid proline is critical. In particular, SH3, WW, and several new protein-interaction domains prefer ligand sequences that are proline-rich. In addition, even though ligands for EH domains and 143-3 domains are not proline-rich, they do include a single proline residue. This review highlights the analysis of those proteinprotein interactions that involve proline residues, the biochemistry of proline, and current drug discovery efforts based on proline peptidomimetics.Kay, B. K., Williamson, M. P., Sudol, M. The importance of being proline: the interaction of proline-rich motifs in signaling proteins with their cognate domains.
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