Extreme disorder in an ultrahigh-affinity protein complex.

Extreme disorder in an ultrahigh-affinity protein complex.
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DOI:
10.1038/nature25762
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发表时间:
2018-03-01
期刊:
影响因子:
64.8
通讯作者:
Schuler B
Schuler B
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Borgia A;Borgia MB;Bugge K;Kissling VM;Heidarsson PO;Fernandes CB;Sottini A;Soranno A;Buholzer KJ;Nettels D;Kragelund BB;Best RB;Schuler B

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生物学中的分子通讯是由蛋白质相互作用介导的。根据目前的范例,这些相互作用所需的特异性和亲和力编码在结合界面的精确互补性中。即使是在生理条件下无序的蛋白质或包含大的非结构化区域的蛋白质,通常也会与其他生物分子上结构良好的结合位点相互作用。在这里,我们证明了一个意想不到的相互作用机制的存在:两个本质上无序的人类蛋白质组蛋白H1和它的核伴侣蛋白原胸腺素α以皮摩尔亲和力结合在一个复合物中,但它们完全保留了它们的结构无序性,长程柔性和高度动态特性。基于实验和分子模拟的紧密结合,我们表明,这种相互作用可以解释为两种蛋白质的大的相反的净电荷,而不需要定义的结合位点或特定的单个残基之间的相互作用。全蛋白质组序列分析表明,这种相互作用机制可能是令人惊讶的丰富的真核生物。
Molecular communication in biology is mediated by protein interactions. According to the current paradigm, the specificity and affinity required for these interactions are encoded in the precise complementarity of binding interfaces. Even proteins that are disordered under physiological conditions or contain large unstructured regions commonly interact with well-structured binding sites on other biomolecules. Here we demonstrate the existence of an unexpected interaction mechanism: The two intrinsically disordered human proteins histone H1 and its nuclear chaperone prothymosin α associate in a complex with picomolar affinity, but they fully retain their structural disorder, long-range flexibility, and highly dynamic character. Based on the close integration of experiments and molecular simulations, we show that the interaction can be explained by the large opposite net charge of the two proteins without requiring defined binding sites or interactions between specific individual residues. Proteome-wide sequence analysis suggests that this interaction mechanism may be surprisingly abundant in eukaryotes.
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发表时间: 1991-06-15
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