6tr0
Solution structure of U2AF2 RRM1,2
Structural highlights
Publication Abstract from PubMedThe recognition of cis-regulatory RNA motifs in human transcripts by RNA binding proteins (RBPs) is essential for gene regulation. The molecular features that determine RBP specificity are often poorly understood. Here, we combined NMR structural biology with high-throughput iCLIP approaches to identify a regulatory mechanism for U2AF2 RNA recognition. We found that the intrinsically disordered linker region connecting the two RNA recognition motif (RRM) domains of U2AF2 mediates autoinhibitory intramolecular interactions to reduce nonproductive binding to weak Py-tract RNAs. This proofreading favors binding of U2AF2 at stronger Py-tracts, as required to define 3' splice sites at early stages of spliceosome assembly. Mutations that impair the linker autoinhibition enhance the affinity for weak Py-tracts result in promiscuous binding of U2AF2 along mRNAs and impact on splicing fidelity. Our findings highlight an important role of intrinsically disordered linkers to modulate RNA interactions of multidomain RBPs. An autoinhibitory intramolecular interaction proof-reads RNA recognition by the essential splicing factor U2AF2.,Kang HS, Sanchez-Rico C, Ebersberger S, Sutandy FXR, Busch A, Welte T, Stehle R, Hipp C, Schulz L, Buchbender A, Zarnack K, Konig J, Sattler M Proc Natl Acad Sci U S A. 2020 Mar 31;117(13):7140-7149. doi:, 10.1073/pnas.1913483117. Epub 2020 Mar 18. PMID:32188783[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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