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Mol Cell Proteomics. 2009 Nov;8(11):2461-73. doi: 10.1074/mcp.M900191-MCP200. Epub 2009 May 30.

Proline-rich sequence recognition: I. Marking GYF and WW domain assembly sites in early spliceosomal complexes.

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  • 1Protein Engineering Group, Leibniz Institute for Molecular Pharmacology and Freie Universität Berlin, Robert-Rössle-Strasse 10, 13125 Berlin, Germany.


Proline-rich sequences (PRS) and their recognition domains have emerged as transposable protein interaction modules during eukaryotic evolution. They are especially abundant in proteins associated with pre-mRNA splicing and likely assist in the formation of the spliceosome by binding to GYF and WW domains. Here we profile PRS-mediated interactions of the CD2BP2/52K GYF domain by a site-specific peptide inhibitor and stable isotope labeling/mass spectrometry analysis. Several PRS hubs with multiple proline-rich motifs exist that can recruit GYF and/or WW domains. Saturating the PRS sites by an isolated GYF domain inhibited splicing at the level of A complex formation. The interactions mediated by PRS are therefore important to the early phases of spliceosomal assembly.

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