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由d(T4isoG4T4)形成的异鸟嘌呤四联体:四链体鉴定与稳定性

Isoguanine quartets formed by d(T4isoG4T4): tetraplex identification and stability.

作者信息

Seela F, Wei C, Melenewski A

机构信息

Laboratorium für Organische und Bioorganische Chemie, Universität Osnabrück, Germany.

出版信息

Nucleic Acids Res. 1996 Dec 15;24(24):4940-5. doi: 10.1093/nar/24.24.4940.

Abstract

The self-aggregation of the oligonucleotide d(T4isoG4T4) (1) is investigated. Based on ion exchange HPLC experiments and CD spectroscopy, a tetrameric structure is identified. This structure was formed in the presence of sodium ions and shows almost the same chromatographic mobility on ion exchange HPLC as d(T4G4T4) (2). The ratio of aggregate versus monomer is temperature dependent and the tetraplex of [d(T4isoG4T4)]4 is more stable than that of [d(T4G4T4)]4. A mixture of d(T4isoG4T4) and d(T4G4T4) forms mixed tetraplexes containing strands of d(T4isoG4T4) and d(T4G4T4).

摘要

对寡核苷酸d(T4isoG4T4) (1)的自聚集进行了研究。基于离子交换高效液相色谱实验和圆二色光谱,确定了一种四聚体结构。该结构在钠离子存在下形成,并且在离子交换高效液相色谱上显示出与d(T4G4T4) (2)几乎相同的色谱迁移率。聚集体与单体的比例取决于温度,且[d(T4isoG4T4)]4的四链体比[d(T4G4T4)]4的更稳定。d(T4isoG4T4)和d(T4G4T4)的混合物形成了包含d(T4isoG4T4)和d(T4G4T4)链的混合四链体。

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