一个简短的DNA序列赋予了强大的白素结合头DNAs
Chenhong Tang1, Ananya Paul, Mohammad P Alam
1Center for BioEnergetics, Biodesign Institute, and Department of Chemistry and Biochemistry, Arizona State University , Tempe, Arizona 85287, United States.
Journal of the American Chemical Society
|September 5, 2014
概括
研究人员确定了一种特定的DNA序列 (5'-ACGC/5'-GCGT),该序列强烈结合白色素 (BLM) 并增强DNA裂变. 这一发现揭示了强大的BLM-DNA相互作用和裂变机制的关键动机.
科学领域:
- 生物化学和分子生物学
- DNA与药物的相互作用
- 化学生物学 化学生物学
背景情况:
- 白素 (BLM) 是一种抗癌药物,与DNA相互作用,导致裂变.
- 了解影响BLM结合和活性的DNA结构特征对于药物开发至关重要.
- 之前的研究已经确定了与BLM有很高亲和力的针头DNA库.
研究的目的:
- 为了研究发针DNA中的结构特征,促进强烈的白素 (BLM) -DNA相互作用.
- 确定负责增强BLM结合和分裂的特定DNA序列.
- 为了阐明BLM诱导的DNA双链裂变的机制.
主要方法:
- 根据对固定铁的亲和力来选择针头DNA库(III) -BLM A5.5.
- 用DNA测序来识别高亲和度结合剂中常见的基因.
- 表面等离子体共振 (SPR) 用于量化BLM-DNA结合动力学和静电学.
- 使用Fe(II) -BLM A5.5对DNA裂变部位的评估
主要成果:
- 两个带有5acgc/5'gcgt'动图的头DNA序列表现出最强的与BLM结合.
- 这些高亲和度DNA在特定部位显著增加了双链裂变.
- SPR分析证实了Fe ((III) -BLM B2的1:1结合模型,表明了特定的结合.
- 插入5acgc/5"gcgt"图案将一个糟糕的BLM粘合剂转换为一个强大的粘合剂.
结论:
- 5 acgc/5 'gcgt' DNA 序列是强大的白氨基素结合的关键动机.
- 更紧密的BLM-DNA结合与通过一种新的机制增加的双链DNA裂变相关.
- 这种模式可以被利用来提高BLM的有效性,并指导新型DNA向剂的设计.
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