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PDZ Domain Binding Selectivity Is Optimized Across the Mouse Proteome
Michael A. Stiffler,1*Jiunn R. Chen,2*Viara P. Grantcharova,1Ying Lei,1Daniel Fuchs,1John E. Allen,1Lioudmila A. Zaslavskaia,1Gavin MacBeath1
PDZ domains have long been thought to cluster into discretefunctional classes defined by their peptide-binding preferences.We used protein microarrays and quantitative fluorescence polarizationto characterize the binding selectivity of 157 mouse PDZ domainswith respect to 217 genome-encoded peptides. We then traineda multidomain selectivity model to predict PDZ domain–peptideinteractions across the mouse proteome with an accuracy thatexceeds many large-scale, experimental investigations of protein-proteininteractions. Contrary to the current paradigm, PDZ domainsdo not fall into discrete classes; instead, they are evenlydistributed throughout selectivity space, which suggests thatthey have been optimized across the proteome to minimize cross-reactivity.We predict that focusing on families of interaction domains,which facilitates the integration of experimentation and modeling,will play an increasingly important role in future investigationsof protein function.
1 Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA. 2 Department of Molecular and Cellular Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA.
* These authors contributed equally to this work.
Present address: Merrimack Pharmaceuticals, 1 Kendall Square,Building 700, Cambridge, MA 02139, USA.
Present address: Tepnel Lifecodes Corporation, 550 West Avenue,Stamford, CT 06902, USA.
To whom correspondence should be addressed. E-mail: macbeath{at}chemistry.harvard.edu
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