Site-specific excision from RNA by RNase H and mixed-phosphate-backbone oligodeoxynucleotides.

作者: S. Agrawal , S. H. Mayrand , P. C. Zamecnik , T. Pederson

DOI: 10.1073/PNAS.87.4.1401

关键词:

摘要: Oligodeoxynucleotides containing phosphodiester or modified internucleoside linkages were investigated with respect to their ability be acted on by ribonuclease H activities present in a HeLa cell nuclear extract after hybridization complementary sequences RNA. nucleotides 2-14 of human U1 small RNA investigated. Extensive cleavage was observed the unmodified oligodeoxynucleotide and phosphorothioate analogue but not U1-complementary oligodeoxynucleotides methylphosphonate, phosphoro-N-morpholidate, phosphoro-N-butylamidate linkages. Additional experiments using 514-nucleotide-long substrate demonstrated capacity phosphodiester- phosphorothioate-linked (but ones linkages) serve as RNase targets when hybridized an internal site. Detailed comparisons revealed phosphodiester-linked more efficient than comparable oligomers action. Various pentadecamer test 2-6 consecutive flanked H-resistant methylphosphonate afforded precise "site-directed" excision within DNA.RNA hybrid. These results assort oligodeoxynucleotide-containing hybrids into H-sensitive -resistant classes also provide clues how makes contact DNA strand

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