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Induced folding of the U2AF35 RRM upon binding to U2AF65
Esther Kellenberger1, Gunter Stier, Michael Sattler
1Structural and Computational Biology Programme, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany. ekellen@aspirine.u-strasbg.fr
Abstract:
The human essential splicing factor U2AF (U2 auxiliary factor) consists of 35 and 65 kDa subunits which form a highly stable heterodimer in solution. Copurification of the recombinant U2AF35 RNA recognition motif (U2AF35 RRM) and full-length U2AF65 yields a soluble and functionally active minimal U2AF heterodimer. Recombinant U2AF35 RRM protein free and in complex with three different regions of U2AF65 was characterized by nuclear magnetic resonance spectroscopy. We found that the recombinant U2AF35 RRM is unstructured in solution but its tertiary structure is induced upon binding to U2AF65. This interaction is mediated by the N-terminal proline-rich region of U2AF65 and does not involve the U2AF65 RRMs.