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首页> 外文期刊>Journal of Biomolecular Structure and Dynamics >Distamycin-stabilized antiparallel-parallel combination (APC) DNA.
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Distamycin-stabilized antiparallel-parallel combination (APC) DNA.

机译:双霉素稳定的反平行-平行组合(APC)DNA。

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摘要

The formation of Antiparallel-Parallel-Combination (APC) DNA, a liner duplex with a segment of parallel-stranded (ps) helix flanked by conventional B-DNA, was tested with a number of synthetic oligonucleotides. The groove-binding ligand distamycin A (DstA) was used to stabilize the ps segment comprising five A x T base pairs. Two drug molecules bound per APC, one in each of the two equivalent grooves characteristic of ps-DNA. APC-DNA, reference molecules and their complexes with DstA were analysed by several methods: circular dichroism and absorption spectroscopy, thermal denaturation, chemical modification, and molecular modeling. The dye binding stoichiometry differed significantly due to inherent structural differences in the groove geometries of ps-DNA (trans base pairs, similar grooves) and conventional antiparallel-stranded (aps) B-DNA (cis base pairs, distinct major and minor grooves). The data support the existence of APC folding in solution.
机译:用许多合成的寡核苷酸测试了反平行-平行结合(APC)DNA的形成,该DNA是带有一段平行链(ps)螺旋,两侧是常规B-DNA的衬里双链体。凹槽结合配体双棉霉素A(DstA)用于稳定包含五个A x T碱基对的ps片段。每个APC结合了两个药物分子,分别是ps-DNA的两个等效凹槽中的一个。 APC-DNA,参考分子及其与DstA的配合物通过几种方法进行了分析:圆二色性和吸收光谱,热变性,化学修饰和分子建模。由于ps-DNA的凹槽几何结构中的固有结构差异(反式碱基对,相似的凹槽)和常规的反平行链(aps)B-DNA(顺式碱基对,不同的主要和次要凹槽),染料结合的化学计量存在显着差异。数据支持解决方案中APC折叠的存在。

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