Synthesis and DNA cleavage of 2′-O-amino-linked metalloporphyrin–oligonucleotide conjugates
作者:Igor Dubey、Geneviève Pratviel、Bernard Meunier
DOI:10.1039/b004431h
日期:——
A new general method for an easy 2â²-O-modification of nucleosides is reported. We describe the preparation of modified 19-mer oligonucleotides carrying an aminoalkyl linker at the 2â²-position of cytidine residues and the covalent attachment of an artificial chemical nuclease, a manganese(III) tris(N-methylpyridinium-4-yl)porphyrin moiety, onto the functionalized linker. The positions of attachment of the manganese cationic porphyrin within the 19-mer vector sequence and the length of the tether were selected in order to have the DNA-cleaver entity close to an (AT)3-sequence in the duplex region formed by the 19-mer oligonucleotide vector and a single-stranded DNA target. The cleavage pattern of the target DNA by these new metalloporphyrinâoligonucleotide conjugates was compared with that obtained with the 19-mer oligonucleotide conjugate carrying the metalloporphyrin at the 5â²-end.
报道了一种新的通用方法,用于对核苷进行简便的2'位O-修饰。本文描述了制备在胞嘧啶残基的2'位携带氨基烷基连接子的修饰型19聚体寡核苷酸,并将一种人工化学核酸酶,即三(N-甲基吡啶鎓-4-基)卟啉锰(III)部分共价连接到该功能化连接子上。选择锰阳离子卟啉在19聚体载体序列中的连接位置和连接链的长度,以便使DNA切割实体靠近由19聚体寡核苷酸载体和单链DNA靶标形成的杂交区域中的(AT)3序列。比较了这些新型金属卟啉-寡核苷酸偶联物对靶DNA的切割模式与5'端携带金属卟啉的19聚体寡核苷酸偶联物所得的结果。