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arXiv 1611.00545physics.bio-phq-bio.BM
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一个多分辨率模型来捕捉酶的全局波动和配体结合位点的分子识别

A multi-resolution model to capture both global fluctuations of an enzyme and molecular recognition in the ligand-binding site

Aoife C. Fogarty, Raffaello Potestio, Kurt Kremer

摘要:

在多分辨率仿真中,不同的系统组件以不同的分辨率水平同时建模,这些组件被平滑地耦合在一起。在酶系统的情况下,需要在活性位点中计算昂贵的原子细节以捕获底物结合的化学反应。蛋白质其余部分的全局特性也发挥着重要作用,决定了结合位点的结构和波动;然而,这些可以在更粗糙的水平上建模。类似地,在计算效率最高的方案中,只有使活性位点水合的溶剂需要原子细节。我们提出了一种方法来耦合原子和粗粒度的蛋白质模型,而在原子水溶解的蛋白质的原子部分。这允许自由选择原子地包括哪些蛋白质和溶剂自由度,而不会损失原子描述的准确性。这种多分辨率的方法可以成功地模拟稳定的配体结合,我们进一步确认其有效性,通过探索相关的酶功能的系统特性。除了计算加速之外,这种方法还可以识别在给定过程中发挥作用的基本自由度,从而可能对生物分子功能产生新的见解。

英文摘要:

In multi-resolution simulations, different system components are simultaneously modelled at different levels of resolution, these being smoothly coupled together. In the case of enzyme systems, computationally expensive atomistic detail is needed in the active site to capture the chemistry of substrate binding. Global properties of the rest of the protein also play an essential role, determining the structure and fluctuations of the binding site; however, these can be modelled on a coarser level. Similarly, in the most computationally efficient scheme only the solvent hydrating the active site requires atomistic detail. We present a methodology to couple atomistic and coarse-grained protein models, while solvating the atomistic part of the protein in atomistic water. This allows a free choice of which protein and solvent degrees of freedom to include atomistically, without loss of accuracy in the atomistic description. This multi-resolution methodology can successfully model stable ligand binding, and we further confirm its validity via an exploration of system properties relevant to enzymatic function. In addition to a computational speedup, such an approach can allow the identification of the essential degrees of freedom playing a role in a given process, potentially yielding new insights into biomolecular function.

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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