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Crystallization and preliminary X-ray analysis of a U2AF65 variant in complex with a polypyrimidine-tract analogue by
E Allen Sickmier1, Katherine E Frato, Clara L Kielkopf
1Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland 21205, USA.
Abstract:
The large subunit of the essential pre-mRNA splicing factor U2 auxiliary factor (U2AF65) binds the polypyrimidine tract near the 3' splice site of pre-mRNA introns and directs the association of the U2 small nuclear ribonucleoprotein particle (U2 snRNP) of the spliceosome with the pre-mRNA. Protein engineering, in which the flexible linker region connecting tandem RNA-recognition motifs (RRMs) within the U2AF65 RNA-binding domain was partially deleted, allowed successful crystallization of the protein-nucleic acid complex. Cocrystals of a U2AF65 variant with a deoxyuridine dodecamer diffract X-rays to 2.9 angstroms resolution and contain one complex per asymmetric unit.
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