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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Conformational Sampling of Peptides in the Presence of Protein Crowders from AA/CG-Multiscale Simulations
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Conformational Sampling of Peptides in the Presence of Protein Crowders from AA/CG-Multiscale Simulations

机译:从AA / CG-多尺度模拟的蛋白质拥挤存在肽的构象采样

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Macromolecular crowding is recognized as an important factor influencing folding and conformational dynamics of proteins and nucleic acids. Previous views of crowding have focused on the mostly entropic volume exclusion effect of crowding, but recent studies are indicating the importance of enthalpic effects, in particular, changes in electrostatic interactions due to crowding. Here, temperature replica exchange molecular dynamics simulations of trp-cage and melittin in the presence of explicit protein crowders are presented to further examine the effect of protein crowders on peptide dynamics. The simulations involve a three-component multiscale modeling scheme where the peptides are represented at an atomistic level, the crowder proteins at a coarse-grained level, and the surrounding aqueous solvent as implicit solvent. This scheme optimally balances a physically realistic description for the peptide with computational efficiency. The multiscale simulations were compared with simulations of the same peptides in different dielectric environments with dielectric constants ranging from 5 to 80. It is found that the sampling in the presence of the crowders resembles sampling with reduced dielectric constants between 10 and 40. Furthermore, diverse conformational ensembles are generated in the presence of crowders including partially unfolded states for trp-cage. These findings emphasize the importance of enthalpic interactions over volume exclusion effects in describing the effects of cellular crowding.
机译:大分子拥挤被认为是影响蛋白质和核酸折叠和构象动力学的重要因素。拥挤的先前观点集中在拥挤的大部分熵体积排斥效应上,但是最近的研究表明焓效应的重要性,尤其是由于拥挤引起的静电相互作用的变化。在这里,提出了在存在明确的蛋白质拥挤剂的情况下,trp-笼和蜂毒肽的温度复制交换分子动力学模拟,以进一步检查蛋白质拥挤剂对肽动力学的影响。模拟涉及三组分多尺度建模方案,其中肽以原子水平表示,crowder蛋白以粗粒度水平表示,周围的水性溶剂为隐式溶剂。该方案最佳地平衡了肽的物理现实描述与计算效率。将多尺度模拟与相同肽在不同介电环境中的介电常数范围为5到80的模拟进行了比较。发现在存在拥挤物的情况下采样类似于在10到40之间的介电常数降低的采样。构象集合是在存在拥挤物的情况下产生的,包括用于trp笼的部分展开状态。这些发现强调了焓相互作用比体积排斥效应在描述细胞拥挤效应中的重要性。

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