Synthesis of Formacetal-Linked Dinucleotides to Facilitate dsDNA Bending and Binding to the Homeodomain of Pax6
作者:Marian Pitulescu、Marcel Grapp、Ralph Krätzner、Willhart Knepel、Ulf Diederichsen
DOI:10.1002/ejoc.200701178
日期:2008.4
Two formacetal-linked dinucleotides TT and TA were synthesized as phosphoramidite building blocks for solid-phase synthesis. Incorporated in a 29-mer DNA, the oligomers P3TT and P3TA were studied with respect to the binding activity towards the Pax6 homeodomain. Substitution of the negatively charged phosphodiester by a neutral formacetal linker facilitates the bent conformation of double-stranded
合成了两个甲缩醛连接的二核苷酸 TT 和 TA 作为固相合成的亚磷酰胺结构单元。结合在 29 聚体 DNA 中,研究了寡聚体 P3TT 和 P3TA 对 Pax6 同源结构域的结合活性。中性甲缩醛接头取代带负电荷的磷酸二酯有利于双链 DNA 的弯曲构象。双链体稳定性受 TT 甲缩醛修饰的影响更显着,而由 TA 引起的不稳定影响不太明显。基于CD光谱,TA甲缩醛修饰的寡聚体P3TA主要具有B-DNA拓扑结构,而P3TT修饰的寡聚体显着偏离B-型DNA。P3 寡聚体对 Pax6 HD 的结合亲和力通过体外 EMSA 实验进行了研究,提供了对 P3TT 寡聚体的结合亲和力的小幅增加。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)