暂时的胡格斯基对在正规双重DNA中
Evgenia N Nikolova1, Eunae Kim, Abigail A Wise
1Department of Chemistry and Biophysics, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, USA.
Nature
|January 29, 2011
概括
DNA可以暂时形成非正规的胡格斯基对,扩大其结构复杂性. 这些发现揭示了遗传密码的第二个短暂层,这对DNA识别和功能至关重要.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物物理学的生物物理.
背景情况:
- 规范性DNA结构依赖于沃森-克里克基配对,影响DNA识别,拓和核细胞位.
- 已知序列导向的结构变异在DNA功能中起着重要作用.
研究的目的:
- 为了研究正规DNA复合体中的短暂,序列特定的结构变异.
- 在DNA中描述人口较少,寿命较短的非正规基因对.
主要方法:
- 使用了核磁共振 (NMR) 放松分散光谱.
- 采用定向分子动力学 (MD) 模拟来分析DNA动力学.
主要成果:
- 在CA和TA步骤中观察到来自沃森-克里克基配的短暂的,特定序列的突破.
- 在正规DNA重复体中确定了人口较少,寿命短的A•T和G•C霍格斯基对.
- 在与转录因子结合的DNA和受损的DNA位点中观察到Hoogsteen基对.
结论:
- DNA双螺旋本质上为激发状态的胡格斯基对编码,增加了超越沃森-克里克配对的结构复杂性.
- 提出的方法提供了一种新的方法来表征短暂的,低人口的核酸结构.
- 预计这些短暂的结构在基因组中是丰富的,可能形成第二个短暂的遗传代码层.
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