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CENP-E 中与疾病相关的 nsSNP 的计算筛选和分子动力学模拟。

Computational screening and molecular dynamics simulation of disease associated nsSNPs in CENP-E.

机构信息

School of Bio Sciences and Technology, Vellore Institute of Technology University, Tamil Nadu, India.

出版信息

Mutat Res. 2012 Oct-Nov;738-739:28-37. doi: 10.1016/j.mrfmmm.2012.08.005. Epub 2012 Sep 2.


DOI:10.1016/j.mrfmmm.2012.08.005
PMID:22974711
Abstract

Aneuploidy and chromosomal instability (CIN) are hallmarks of most solid tumors. Mutations in centroemere proteins have been observed in promoting aneuploidy and tumorigenesis. Recent studies reported that Centromere-associated protein-E (CENP-E) is involved in inducing cancers. In this study we investigated the pathogenic effect of 132 nsSNPs reported in CENP-E using computational platform. Y63H point mutation found to be associated with cancer using SIFT, Polyphen, PhD-SNP, MutPred, CanPredict and Dr. Cancer tools. Further we investigated the binding affinity of ATP molecule to the CENP-E motor domain. Complementarity scores obtained from docking studies showed significant loss in ATP binding affinity of mutant structure. Molecular dynamics simulation was carried to examine the structural consequences of Y63H mutation. Root mean square deviation (RMSD), root mean square fluctuation (RMSF), radius of gyration (R(g)), solvent accessibility surface area (SASA), energy value, hydrogen bond (NH Bond), eigenvector projection, trace of covariance matrix and atom density analysis results showed notable loss in stability for mutant structure. Y63H mutation was also shown to disrupt the native conformation of ATP binding region in CENP-E motor domain. Docking studies for remaining 18 mutations at 63rd residue position as well as other two computationally predicted disease associated mutations S22L and P69S were also carried to investigate their affect on ATP binding affinity of CENP-E motor domain. Our study provided a promising computational methodology to study the tumorigenic consequences of nsSNPs that have not been characterized and clear clue to the wet lab scientist.

摘要

非整倍体和染色体不稳定性 (CIN) 是大多数实体瘤的标志。中心体蛋白的突变已被观察到在促进非整倍体和肿瘤发生中起作用。最近的研究报道,着丝粒相关蛋白-E (CENP-E) 参与诱导癌症。在这项研究中,我们使用计算平台研究了 CENP-E 中报道的 132 个 nsSNP 的致病效应。使用 SIFT、Polyphen、PhD-SNP、MutPred、CanPredict 和 Dr. Cancer 工具发现 Y63H 点突变与癌症有关。此外,我们还研究了 ATP 分子与 CENP-E 马达结构域的结合亲和力。对接研究获得的互补评分显示突变结构的 ATP 结合亲和力显著降低。进行分子动力学模拟以检查 Y63H 突变的结构后果。均方根偏差 (RMSD)、均方根波动 (RMSF)、回转半径 (R(g))、溶剂可及表面积 (SASA)、能量值、氢键 (NH 键)、特征向量投影、协方差矩阵迹和原子密度分析结果表明突变体结构的稳定性明显丧失。Y63H 突变还破坏了 CENP-E 马达结构域中 ATP 结合区域的天然构象。还对第 63 位残基位置的其余 18 个突变以及另外两个计算预测的与疾病相关的突变 S22L 和 P69S 进行了对接研究,以研究它们对 CENP-E 马达结构域中 ATP 结合亲和力的影响。我们的研究为研究尚未表征的 nsSNP 的致癌后果提供了一种有前途的计算方法,并为湿实验室科学家提供了明确的线索。

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