Proflavine diazide (PD) with amido-azide substituents on the amine groups and its N-methylated analogue (MePD) bind strongly to DNA by nearest-neighbour intercalation with little sequence selectivity, presenting reactive azide groups in the major groove. PD is neutral in aqueous solution but experiences binding-coupled protonation on interaction with DNA with an apparent pKa shift of 2.5 units. MePD can be click modified in situ on DNA with alkyne-functionalised thienyl-pyrrole as a precursor for conducting polymer synthesis, and remains intercalated after reaction with the substituents aligned in the groove.
带有
氨基取代的
腺嘌呤二嗪(PD)及其N-甲基化的类似物(MePD)通过最近邻插层强烈结合DNA,几乎没有序列选择性,且在主要槽中呈现出反应性
叠氮基团。PD在
水溶液中是中性的,但在与DNA相互作用时经历结合耦合质子化,表观pKa值偏移了2.5个单位。MePD可以在DNA上进行即时点击修饰,使用功能化的
炔烃取代
噻吩-
吡咯作为导体聚合物合成的前驱体,并在与取代基反应后仍然保持插层状态。