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Photocontrolled DNA minor groove interactions of imidazole/pyrrole polyamides.
Beilstein Journal of Organic Chemistry ( IF 2.2 ) Pub Date : 2020-01-09 , DOI: 10.3762/bjoc.16.8 Sabrina Müller 1 , Jannik Paulus 1 , Jochen Mattay 2 , Heiko Ihmels 3 , Veronica I Dodero 1 , Norbert Sewald 1
Beilstein Journal of Organic Chemistry ( IF 2.2 ) Pub Date : 2020-01-09 , DOI: 10.3762/bjoc.16.8 Sabrina Müller 1 , Jannik Paulus 1 , Jochen Mattay 2 , Heiko Ihmels 3 , Veronica I Dodero 1 , Norbert Sewald 1
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Azobenzenes are photoswitchable molecules capable of generating significant structural changes upon E-to-Z photoisomerization in peptides or small molecules, thereby controlling geometry and functionality. E-to-Z photoisomerization usually is achieved upon irradiation at 350 nm (π-π* transition), while the Z-to-E isomerization proceeds photochemically upon irradiation at >400 nm (n-π* transition) or thermally. Photoswitchable compounds have frequently been employed as modules, e.g., to control protein-DNA interactions. However, their use in conjunction with minor groove-binding imidazole/pyrrole (Im/Py) polyamides is yet unprecedented. Dervan-type Im/Py polyamides were equipped with an azobenzene unit, i.e., 3-(3-(aminomethyl)phenyl)azophenylacetic acid, as the linker between two Im/Py polyamide strands. Only the (Z)-azobenzene-containing polyamides bound to the minor groove of double-stranded DNA hairpins. Photoisomerization was exemplarily evaluated by 1H NMR experiments, while minor groove binding of the (Z)-azobenzene derivatives was proven by CD titration experiments. The resulting induced circular dichroism (ICD) bands of the bound ligands, together with the photometric determination of the dsDNA melting temperature, revealed a significant stabilization of the DNA upon association with the ligand. The (Z)-azobenzene acted as a building block inducing a reverse turn, which favored hydrogen bonds between the pyrrole/imidazole amide and the DNA bases. In contrast, the E-configured polyamides did not induce any ICD characteristic for minor groove binding. The incorporation of the photoswitchable azobenzene unit is a promising strategy to obtain photoswitchable Im/Py hairpin polyamides capable of interacting with the dsDNA minor groove only in the Z-configuration.
中文翻译：
咪唑/吡咯聚酰胺的光控DNA小沟相互作用。
偶氮苯是光可转换分子，能够在肽或小分子中进行E-Z光异构化后产生显着的结构变化，从而控制几何结构和功能。E-Z异构化通常是在350 nm（π-π*跃迁）下进行的，而Z-E异构化则是在> 400 nm（n-π*跃迁）下进行的，以光化学方式进行或通过热进行。光可开关化合物经常被用作模块，例如以控制蛋白质-DNA相互作用。但是，将它们与次要的结合沟的咪唑/吡咯（Im / Py）聚酰胺结合使用仍是前所未有的。Dervan型Im / Py聚酰胺配有偶氮苯单元，即3-（3-（氨基甲基）苯基）偶氮苯基乙酸，作为两条Im / Py聚酰胺链之间的连接基。仅含（Z）-偶氮苯的聚酰胺与双链DNA发夹的小沟结合。通过1 H NMR实验示例性地评估了光致异构化，同时通过CD滴定实验证明了（Z）-偶氮苯衍生物的微小凹槽结合。结合的配体产生的诱导的圆二色性（ICD）带，以及dsDNA熔解温度的光度测定，揭示了与配体缔合后DNA的显着稳定。（Z）-偶氮苯作为诱导逆转的结构单元，有利于吡咯/咪唑酰胺与DNA碱基之间的氢键。相反，E-构型的聚酰胺没有引起任何ICD特征，从而较小的沟槽结合。
更新日期：2020-01-09
中文翻译：
咪唑/吡咯聚酰胺的光控DNA小沟相互作用。
偶氮苯是光可转换分子，能够在肽或小分子中进行E-Z光异构化后产生显着的结构变化，从而控制几何结构和功能。E-Z异构化通常是在350 nm（π-π*跃迁）下进行的，而Z-E异构化则是在> 400 nm（n-π*跃迁）下进行的，以光化学方式进行或通过热进行。光可开关化合物经常被用作模块，例如以控制蛋白质-DNA相互作用。但是，将它们与次要的结合沟的咪唑/吡咯（Im / Py）聚酰胺结合使用仍是前所未有的。Dervan型Im / Py聚酰胺配有偶氮苯单元，即3-（3-（氨基甲基）苯基）偶氮苯基乙酸，作为两条Im / Py聚酰胺链之间的连接基。仅含（Z）-偶氮苯的聚酰胺与双链DNA发夹的小沟结合。通过1 H NMR实验示例性地评估了光致异构化，同时通过CD滴定实验证明了（Z）-偶氮苯衍生物的微小凹槽结合。结合的配体产生的诱导的圆二色性（ICD）带，以及dsDNA熔解温度的光度测定，揭示了与配体缔合后DNA的显着稳定。（Z）-偶氮苯作为诱导逆转的结构单元，有利于吡咯/咪唑酰胺与DNA碱基之间的氢键。相反，E-构型的聚酰胺没有引起任何ICD特征，从而较小的沟槽结合。
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