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弯曲DNA片段凝胶迁移异常的温度和盐依赖性

Temperature and salt dependence of the gel migration anomaly of curved DNA fragments.

作者信息

Diekmann S

出版信息

Nucleic Acids Res. 1987 Jan 12;15(1):247-65. doi: 10.1093/nar/15.1.247.

Abstract

A series of oligonucleotides of different sequences have been cloned to study DNA curvature. Several DNA fragments containing these oligonucleotides in various numbers of repeats were analyzed in 10% polyacrylamide gels. A strong gel migration anomaly was found for dA4 sequences; a comparably very small but clearly detectable anomaly was observed for dA3 (both in a repeat length of 10 base-pairs). The temperature and salt (NaCl, MgCl2) dependence of the gel migration anomaly of these DNA fragments was measured. While a similar behaviour of all sequences is observed for the addition of NaCl, the temperature and MgCl2 dependence of the anomaly varies with the oligonucleotide sequence. These data are interpreted in terms of local DNA structure changes induced by changes in the temperature and the MgCl2 concentration which affect the planarity of the curved DNA fragments.

摘要

已克隆了一系列不同序列的寡核苷酸以研究DNA弯曲。在10%的聚丙烯酰胺凝胶中分析了几个含有不同重复次数这些寡核苷酸的DNA片段。发现dA4序列存在强烈的凝胶迁移异常;对于dA3(重复长度均为10个碱基对)观察到相对非常小但明显可检测到的异常。测量了这些DNA片段凝胶迁移异常的温度和盐(NaCl、MgCl2)依赖性。虽然添加NaCl时所有序列表现出相似行为,但异常的温度和MgCl2依赖性随寡核苷酸序列而变化。这些数据根据温度和MgCl2浓度变化引起的局部DNA结构变化来解释,这些变化会影响弯曲DNA片段的平面性。

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