Toward an Understanding of the Chemical Etiology for DNA Minor-Groove Recognition by Polyamides
作者:Michael A. Marques、Raymond M. Doss、Adam R. Urbach、Peter B. Dervan
DOI:10.1002/hlca.200290024
日期:2002.12
Crescent-shaped polyamides composed of aromatic amino acids, i.e., 1-methyl-1H-imidazole Im, 1-methyl-1H-pyrrole Py, and 3-hydroxy-1H-pyrrole Hp, bind in the minor groove of DNA as 2 : 1 and 1 : 1 ligand/DNA complexes. DNA-Sequence specificity can be attributed to shape-selective recognition and the unique corners or pairs of corners presented by each heterocycle(s) to the edges of the base pairs on
由芳族氨基酸,即1-甲基-1 H-咪唑Im,1-甲基-1 H-吡咯Py和3-羟基-1 H-吡咯Hp组成的月牙形聚酰胺,以2:1和1:1配体/ DNA复合物的形式结合在DNA的小沟中。DNA序列特异性可归因于形状选择性识别以及每个杂环在小沟纹底面上的碱基对的边缘所呈现的唯一角或成对的角。在这里,我们研究了五元芳香族氨基酸家族的杂环结构与DNA序列特异性之间的关系。通过定量DNase-I足迹分析法,包含8种不同的芳香族氨基酸的聚酰胺的识别行为,即1-甲基-1 H-吡唑Pz,1 H-吡咯Nh,5-甲基噻唑Nt和4-甲基噻唑Th,将3-甲基噻吩Tn,噻吩Tp,3-羟基噻吩Ht和呋喃Fr与含有母环氨基酸Py,Im和Hp的聚酰胺进行了比较,以区分DNA中的四个WatsonCrick碱基对小沟。数据分析和分子建模表明,每个杂环固有的几何形状在聚酰胺区分DNA序列的能力中起着重要作用。结合似乎对聚酰胺和D