Synthesis and duplex stability of oligodeoxyribonucleotides containing a 2′→5′-amide linkage
作者:Mai-Yee Chan、Robin A. Fairhurst、Stephen P. Collingwood、Julie Fisher、John R. P. Arnold、Richard Cosstick、Ian A. O’Neil
DOI:10.1039/a808505f
日期:——
2â²-Deoxy-2â²-α-C-carboxymethyl-3â²-O-tert-butyldimethylsilyl-5â²-O-dimethoxytrityluridine (11a) and the corresponding 3â²-deoxy derivative 2â²,3â²-dideoxy-2â²-α-C-carboxymethyl-5â²-O-dimethoxytrityluridine (11b) have been condensed with 5â²-amino-5â²-deoxythymidine to prepare dinucleotide analogues (5a and 5b) which contain a 2â²â5â²-amide linkage. These dimer units have been incorporated into deoxynucleotide dodecamers using solid-phase phosphoramidite chemistry. Thermal melting studies show that a single 2â²â5â²-amide linkage in a deoxyoligonucleotide has a considerable destabilising effect on duplexes formed with both the DNA and RNA complementary sequences. Interestingly, the amide linkage has a significantly greater destabilising influence in the DNA duplexes than in the RNA hybrids.
2-脱氧-2-脱氧-C-羧甲基-3-O-叔丁基二甲基甲硅烷基-5-O-二甲氧基三苯甲基尿苷(11a)和相应的3-脱氧衍生物2-, 3-二脱氧-2-α-C-羧甲基-5-O-二甲氧基三苯甲基尿苷 (11b) 与 5-氨基-5-脱氧胸苷缩合以制备二核苷酸类似物(5a 和 5b) ),其中包含2-5-酰胺键。使用固相亚磷酰胺化学将这些二聚体单元整合到脱氧核苷酸十二聚体中。热熔解研究表明,脱氧寡核苷酸中的单个 2-5-酰胺键对由 DNA 和 RNA 互补序列形成的双链体具有相当大的不稳定作用。有趣的是,酰胺键在 DNA 双链体中比在 RNA 杂合体中具有显着更大的不稳定影响。