Requirement of β-alanine components in sequence-specific DNA alkylation by pyrrole–imidazole conjugates with seven-base pair recognition
作者:Toshikazu Bando、Masafumi Minoshima、Gengo Kashiwazaki、Ken-ichi Shinohara、Shunta Sasaki、Jun Fujimoto、Akimichi Ohtsuki、Masataka Murakami、Satomi Nakazono、Hiroshi Sugiyama
DOI:10.1016/j.bmc.2007.11.064
日期:2008.3
(site 4). In contrast, conjugated 8, with a Py/Py pair, showed lower activity and less alkylated DNA at sites 2 and 4 with mismatched alkylation at site 1 at a higher concentration than that of 6 and 7. These results demonstrate that incorporation of beta-alanine is required for the sequence-specific alkylation by seco-CBI Py-Im conjugates with a seven-base pair sequence.
为了研究将β-丙氨酸掺入烷基化N-甲基吡咯(Py)-N-甲基咪唑(Im)聚酰胺中的作用,通过Fmoc固相方法合成了seco-CBI共轭物2-8,随后与烷基化部分偶联。结合物2-8的DNA烷基化活性通过高分辨率变性凝胶电泳和202个碱基对(bp)的DNA片段进行评估。具有与β(丙氨酸/β)和Py /β相反的β-丙氨酸(β)的反平行配对的缀合物2和3的烷基化主要发生在匹配序列5'-AGCTCCA-3'的腺嘌呤(A)上(网站1)和5'-AGCACCA-3'(网站3)。然而,具有β/ Py的缀合物4没有显示任何DNA烷基化活性。类似地,具有Py / Py对的缀合物5在微摩尔浓度下使匹配位点弱烷基化。共轭6和7,分别具有beta / beta和Py / beta对,在匹配序列的5'-ACTACCA-3'(位点2)和5'-ACAACCA-3'(位点4)的A处烷基化。相反,具有Py / Py对的共轭8则