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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Cooperative macromolecular device revealed by meta-analysis of static and time-resolved structures
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Cooperative macromolecular device revealed by meta-analysis of static and time-resolved structures

机译:静态和时间分辨结构的荟萃分析揭示了合作的大分子装置

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摘要

Here we present a meta-analysis of a large collection of static structures of a protein in the Protein Data Bank in order to extract the progression of structural events during protein function. We apply this strategy to the homodimeric hemoglobin Hbl from Scapharca inaequivalvis. We derive a simple dynamic model describing how binding of the first ligand in one of the two chemically identical subunits facilitates a second binding event in the other partner subunit. The results of our ultrafast time-resolved crystallographic studies support this model. We demonstrate that Hbl functions like a homodimeric mechanical device, such as pliers or scissors. Ligand-induced motion originating in one subunit is transmitted to the other via conserved pivot points, where the E and F helices from two partner subunits are "bolted" together to form a stable dimer interface permitting slight relative rotation but preventing sliding.
机译:在这里,我们介绍了蛋白质数据库中蛋白质静态结构的大量集合的荟萃分析,以便提取蛋白质功能过程中结构事件的进展。我们将此策略应用于来自Scapharca inaequivalvis的同型二聚体血红蛋白Hbl。我们得到一个简单的动力学模型,描述了两个化学上相同的亚基之一中的第一个配体的结合如何促进另一个伙伴亚基中的第二个结合事件。我们超快的时间分辨晶体学研究结果支持该模型。我们证明Hbl的功能类似于同二聚体机械设备,如钳子或剪刀。源自一个亚基的配体诱导的运动通过保守的枢轴点传输到另一个,其中两个配对亚基的E和F螺旋被“锚定”在一起,形成稳定的二聚体界面,允许轻微的相对旋转但防止滑动。

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