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在2.8A分辨率下刻录的家庭主体-DNA复合体的晶体结构:理解家庭主体-DNA相互作用的框架
C R Kissinger1, B S Liu, E Martin-Blanco
1Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205.
Cell
|November 2, 1990
概括
嵌入式的家庭主权.
科学领域:
- 结构生物学是结构生物学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 嵌入的家庭主体是一个转录因子,对胚胎发育至关重要.
- 家庭主体蛋白质通过结合特定的DNA序列来调节基因表达.
- 了解家庭主域和DNA之间的精确相互作用是解读发育途径的关键.
研究的目的:
- 为了确定与其目标DNA序列结合的嵌入式家庭主域的高分辨率晶体结构.
- 阐明调控TAAT核心共识站点特定识别的分子相互作用.
- 为了将DNA结合机制与其他已知的螺旋-转-螺旋蛋白进行比较.
主要方法:
- 采用X射线晶体学来确定该综合体的结构.
- 该复合体被结晶,并收集到2.8A分辨率的数据.
- 晶体结构的精炼是以24.4%的晶体学R因子进行的.
主要成果:
- 晶体结构揭示了两个不同的区域,与TAAT DNA子站点相互作用.
- 一个N端臂插入小槽,Arg-3和Arg-5在5'端附近进行接触.
- 一个阿尔法螺旋"识别螺旋"占据了主要槽,Ile-47和Asn-51与3'端附近的基对相互作用.
- 嵌入式家庭主体中的螺旋旋转螺旋单元在结构上是保存的,但与lambda抑制器相比,它表现出更长的螺旋和不同的DNA结合方向.
结论:
- 嵌入式本地主体采用双区域DNA结合策略,涉及小沟和大沟相互作用.
- 在N端臂和识别螺旋中,特定的氨基酸侧链对于TAAT位点识别至关重要.
- 结构发现提供了关于螺旋转蛋白之间的DNA结合机制的演化和多样性的见解.
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