Synthesis of 2′,4′-Propylene-Bridged (Carba-ENA) Thymidine and Its Analogues: The Engineering of Electrostatic and Steric Effects at the Bottom of the Minor Groove for Nuclease and Thermodynamic Stabilities and Elicitation of RNase H
作者:Yi Liu、Jianfeng Xu、Mansoureh Karimiahmadabadi、Chuanzheng Zhou、Jyoti Chattopadhyaya
DOI:10.1021/jo101207d
日期:2010.11.5
any, effect on nuclease resistance but 8′S-OH resulted in significantly decreased nucleolytic stability; and (3) 8′-NH2 substituted carba-ENA leads to obvious loss in the nuclease resistance. The RNA strand in all of the carba-ENA derivatives modified AON:RNA hybrid duplexes can be digested by RNase H1 with high efficiency, even at twice the rate of those of the native and ENA modified counterpart.
2',4'-丙烯桥胸苷(carba-ENA-T)和5个8'-Me / NH 2通过将分子内自由基加成到束缚的肟-醚的C═N中,已经制备了/ OH修饰的氨基-ENA-T类似物。这些碳烯-ENA核苷随后被掺入15mer寡脱氧核苷酸(AON)中,并且与天然和ENA对应物相比,已研究了它们对cDNA和RNA的亲和力,核酸酶抗性和RNase H募集能力。这些碳烯-ENA修饰的AON具有高度的RNA选择性,因为它们都对AON:RNA双链体产生轻微的热稳定作用,但对AON:DNA双链体产生相当大的去稳定作用。发现在carba-ENA-T上不同的C8'取代基(在小凹槽的底部)仅导致AON:RNA双链体的热稳定性变化很小。但是,我们 观察到,亲代碳酸酯-ENA-T修饰的AONs表现出比ENA-T修饰的对应物更高的核酸分解稳定性。不仅取决于化学性质,而且取决于C8'取代基的立体化学取向,C8'取代基还可以进一