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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Spiral structure of Escherichia coli HUαβ provides foundation for DNA supercoiling
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Spiral structure of Escherichia coli HUαβ provides foundation for DNA supercoiling

机译:大肠杆菌HUαβ的螺旋结构为DNA超螺旋奠定了基础

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We determined the crystal structure of the Escherichia coli nucleoid-associated HUαβ protein by x-ray diffraction and observed that the heterodimers form multimers with octameric units in three potential arrangements, which may serve specialized roles in different DNA transaction reactions. It is of special importance that one of the structures forms spiral filaments with left-handed rotations. A negatively superhelical DNA can be modeled to wrap around this left-handed HUαβ multimer. Whereas the wild-type HU generated negative DNA supercoiling in vitro, an engineered heterodimer with an altered amino acid residue critical for the formation of the left-handed spiral protein in the crystal was defective in the process, thus providing the structural explanation for the classical property of HU to restrain negative supercoils in DNA.
机译:我们通过X射线衍射确定了与大肠杆菌核苷相关的HUαβ蛋白的晶体结构,并观察到异二聚体以八种可能的排列形式形成具有八聚体单元的多聚体,这可能在不同的DNA交易反应中起特殊作用。特别重要的是,其中一种结构形成左旋旋转的螺旋丝。可以对负超螺旋DNA进行建模,使其包裹在左手HUαβ多聚体周围。野生型HU在体外产生负DNA超螺旋,而工程改造的异二聚体具有改变的氨基酸残基,该残基对晶体中左旋螺旋蛋白的形成至关重要,从而为经典方法提供了结构上的解释抑制DNA中负超螺旋的特性

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