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结构性洞察力对2-Haloacetophenone的非变异性
Hunmin Jung1,2, Naveen Kumar Rayala2, Ritesh Pal2
1The Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, Storrs, CT 06269, USA.
像N7-acetophenone-dG这样的庞大的DNA adducts可以采用syn conformation,阻碍DNA聚合酶eta活动. 这种结构变化阻止了核酸的结合,解释了这些病变的非变异性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 化剂形成N7-基-2'-脱氧氨酸 (N7-alkylG) DNA添加物,主要病变的突变性潜力不明.
- 抗菌剂2-chloroacetophenone形成N7-acetophenone-dG添加物,但在细胞中没有变异作用.
研究的目的:
- 阐明N7-乙-dGDNA添加物的非变异性质的结构和运动基础.
- 为了了解DNA聚合酶eta (polη) 如何与这种重的添加物相互作用.
主要方法:
- 使用2'-介导的过渡状态不稳定化合成含有N7-乙-dG的寡核酸.
- 人类DNA聚合酶eta (polη) 的动态研究,其中包含与损伤相反的核酸.
- 聚结合于一个不可水解的dCTP模拟物与改性瓜相对的聚的X射线晶体学.
主要成果:
- 与N7-乙-dG损伤相反的核酸合并受到显著阻碍.
- 结构分析显示,模板N7-乙-dG添加物采用一个syn形状.
- 这种同步形状阻止了聚合酶活性部位内的传入核酸结合.
结论:
- 庞大的N7-alkylG病变可以采用一个同步符号,呈现一个可以介质的部分,阻止核酸的结合.
- 这种机制解释了观察到的N7-acetophenone-dG和潜在的其他类似DNA添加物的低突变性.
- 了解这些结构适应对于评估各种DNA损伤剂的基因毒性风险至关重要.
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