by two FPH-1 molecules for 35 different oligomeric duplexes. Single base pair mismatches in the FPH-1 binding site were found to cause significant decreases in K(1)K(2) of 18- to 2300-fold. Thermal denaturation experiments provided similar results. Arguments are presented which favor the structure of the (FPH-1)(2):dsDNA minor groove complex to involve the two FPH-1 molecules in a slightly staggered
已经设计了一种三
吡咯肽-Hoechst 偶联物 (FPH-1),它以亚纳摩尔浓度识别 9 个 dA/dT 碱基对富含 A/T 的 dsDNA 序列,并以接近扩散控制的速率复合其靶标以形成荧光产物。分光荧光滴定显示复合物的
化学计量为 (FPH-1)(2):dsDNA。荧光分光光度法滴定也被用来确定平衡常数的产品复合 (K(1)K(2)) 的 dsDNA 由两个 FPH-1 分子为 35 不同的低聚双工。发现 FPH-1 绑定站点中的单个碱基对不匹配导致 K(1)K(2) 的 18 到 2300 倍显着下降。热变性实验提供了类似的结果。提出了支持 (FPH-1)(2) 结构的论据: