Sequence-specific DNA alkylation and transcriptional inhibition by long-chain hairpin pyrrole–imidazole polyamide–chlorambucil conjugates targeting CAG/CTG trinucleotide repeats
作者:Sefan Asamitsu、Yusuke Kawamoto、Fumitaka Hashiya、Kaori Hashiya、Makoto Yamamoto、Seiichiro Kizaki、Toshikazu Bando、Hiroshi Sugiyama
DOI:10.1016/j.bmc.2014.07.019
日期:2014.9
readily synthesized long-chain hairpin pyrrole–imidazole (PI) polyamide–chlorambucil conjugates 3 and 4 via the introduction of an amino group into a GABA (γ-turn) contained in 3, to target CAG/CTG repeat sequences, which are associated with various hereditary disorders. A high-resolution denaturing polyacrylamide sequencing gel revealed sequence-specific alkylation both strands at the N3 of adenines
在固相肽合成中引入新的组成部分,我们通过将氨基引入到3所含的GABA(γ-转角)中,很容易地合成了长链发夹式吡咯-咪唑(PI)聚酰胺-苯丁酸氮芥共轭物3和4,靶向与各种遗传性疾病相关的CAG / CTG重复序列。高分辨率变性聚丙烯酰胺测序凝胶显示序列特异性烷基化在CAG / CTG重复由缀合物在腺嘌呤或鸟嘌呤的N3两条链3和4,用11个碱基的识别。使用缀合物4的体外转录测定揭示特定的烷基化抑制了在烷基化位点的RNA聚合酶的进程。用氨基手性替换γ-转角会导致在SPR分析中观察到更高的结合亲和力。这些测定表明具有11bp识别的缀合物4具有引起特定DNA损伤和在烷基化位点的转录抑制的潜力。