A diphenyl porphyrin substituted nucleotide was incorporated site specifically into DNA, leading to helical stacked porphyrin arrays in the major groove of the duplexes. The porphyrins show an electronic interaction which is significantly enhanced compared to the analogous tetraphenyl porphyrin (TPP) as shown in the large exciton coupling of the porphyrin B-band absorbance. Analogous to the TPP–DNA, an induced helical secondary structure is observed in the single strand porphyrin–DNA. The modified DNA can be hybridised to an immobilised complementary strand leading to fluorescent beads.
二苯基
卟啉取代的核苷酸被特异性地掺入 DNA 中,从而在双链体的主沟中形成螺旋堆叠的
卟啉阵列。与类似的
四苯基卟啉 (
TPP) 相比,
卟啉显示出显着增强的电子相互作用,如
卟啉 B 波段吸光度的大激子耦合所示。与
TPP-DNA 类似,在单链
卟啉-DNA 中观察到诱导螺旋二级结构。修饰后的 DNA 可以与固定的互补链杂交,形成荧光珠。