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arXiv 1310.0889q-bio.BM
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内在无序蛋白的结构柔性诱导逐步靶向识别

Structural flexibility of intrinsically disordered proteins induces stepwise target recognition

Nobu C. Shirai, Macoto Kikuchi

摘要:

内在无序蛋白(IDP)缺乏稳定的三维结构,而当其与靶分子结合时折叠成特定结构。在一些IDP-靶复合物中,并非所有的靶结合表面都暴露在外部,并且在它们的结合过程中观察到中间状态。我们认为,通过中间状态的逐步目标识别是IDP与具有"隐藏"结合位点的目标结合的特征。为了研究IDP与隐藏靶结合位点的结合,我们在HP模型的基础上构建了IDP晶格模型。在我们的模型中,IDP被建模为一个链和目标被建模为一个高度粗粒度的对象。我们引入运动和内部相互作用的目标,以隐藏其结合位点。在未隐藏的结合位点的情况下,观察到的自由状态和结合状态之间的两个状态的过渡,我们认为,这代表耦合折叠和绑定。引入隐藏的结合位点,我们发现了一个中间结合状态,在该状态下IDP形成各种结构以暂时稳定复合物。中间状态为IDP进入隐藏的结合位点提供了支架。我们称这个过程为多形式绑定。我们的结论是,IDPs的结构灵活性,使他们能够访问隐藏的结合位点,这是一个功能优势的IDPs。

英文摘要:

An intrinsically disordered protein (IDP) lacks a stable three-dimensional structure, while it folds into a specific structure when it binds to a target molecule. In some IDP-target complexes, not all target binding surfaces are exposed on the outside, and intermediate states are observed in their binding processes. We consider that stepwise target recognition via intermediate states is a characteristic of IDP binding to targets with "hidden" binding sites. To investigate IDP binding to hidden target binding sites, we constructed an IDP lattice model based on the HP model. In our model, the IDP is modeled as a chain and the target is modeled as a highly coarse-grained object. We introduced motion and internal interactions to the target to hide its binding sites. In the case of unhidden binding sites, a two-state transition between the free states and a bound state is observed, and we consider that this represents coupled folding and binding. Introducing hidden binding sites, we found an intermediate bound state in which the IDP forms various structures to temporarily stabilize the complex. The intermediate state provides a scaffold for the IDP to access the hidden binding site. We call this process multiform binding. We conclude that structural flexibility of IDPs enables them to access hidden binding sites, and this is a functional advantage of IDPs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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