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Research Papers
Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06510-8024.
Abstract
Intramolecular and intermolecular snRNA cross-links were generated by irradiating HeLa nuclear extract with 365 nm light in the presence of the psoralen derivative AMT. After deproteinization, cross-linked RNAs were resolved by gel electrophoresis and identified as anomalously migrating species by Northern blotting. In addition to the U4/U6 snRNA cross-link, we detected an intermolecular U2/U6 cross-link, as well as several apparently intramolecular U1, U2, and U5 cross-links. Photoreversal of the U2/U6 cross-link with 254 nm irradiation released stoichiometric amounts of U2 and U6 snRNA. To localize the U2/U6 cross-link, the 3' end of U2 in the purified U2/U6 complex was labeled selectively using a novel oligonucleotide "splint" technique. The labeled U2/U6 complex was then subjected to rapid enzymatic RNA sequencing or to targeted digestion of the U2 and U6 components of the complex by RNase H and a panel of complementary oligonucleotides. The U2/U6 cross-link is located upstream of nucleotide 15 in U2 and downstream of nucleotide 85 in U6, suggesting that the phylogenetically conserved base-pairing between these regions (6 consecutive base pairs in human, Drosophila melanogaster, and Caenorhabditis elegans, 7 in Schizosaccharomyces pombe and Trypanasoma brucei, 8 in Pisum sativum, 11 in Saccharomyces cerevisiae) is significant.
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