作者:Doan H. Nguyen、Jason W. Szewczyk、Eldon E. Baird、Peter B. Dervan
DOI:10.1016/s0968-0896(00)00219-4
日期:2001.1
titrations on a DNA fragment with the four sites 5'-TGGNCA-3' (N=T, A, G, C). The Pz/Py pair binds T.A and A.T with similar affinity to a Py/Py pair but with improved specificity. disfavoring both G.C and C.G by about 100-fold. The Th/Py pair binds poorly to all four Watson Crick base pairs. These results demonstrate that in some instances new heterocyclic aromatic amino acid pairs can be incorporated
并排的三个五元环N-甲基吡咯(Py),N-甲基咪唑(Im)和N-甲基羟基吡咯(Hp)已被证明可以区分四个Watson Crick碱基对在DNA的小沟中。但是,并非所有由这些配对规则靶向的DNA序列都能达到与DNA结合蛋白相当的亲和力和特异性。我们已经开始寻找新的杂环,这些杂环可以扩展当前可用的序列表。两个杂环芳族氨基酸。将N-甲基吡唑(Pz)和4-甲基噻唑(Th)掺入序列为ImImXPy-gamma-lmPyPyPy-β-Dp的八环聚酰胺的单个位置中,以检查亲和力对DNA结合的特异性调节Pz / Py对和/或Th / Py对。通过在具有四个位点5'-TGGNCA-3'(N = T,A,G,C)的DNA片段上进行定量DNase I足迹滴定来评估X / Py对Pz / Py和Th / Py。Pz / Py对以与Py / Py对相似的亲和力结合TA和AT,但特异性更高。不利于GC和CG约100倍。Th