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Multi-Dimensional Scaling and MODELLER-Based Evolutionary Algorithms for Protein Model Refinement

机译:多维缩放和基于模型的蛋白质模型优化进化算法

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摘要

Protein structure prediction, i.e., computationally predicting the three-dimensional structure of a protein from its primary sequence, is one of the most important and challenging problems in bioinformatics. Model refinement is a key step in the prediction process, where improved structures are constructed based on a pool of initially generated models. Since the refinement category was added to the biennial Critical Assessment of Structure Prediction (CASP) in 2008, CASP results show that it is a challenge for existing model refinement methods to improve model quality consistently.This paper presents three evolutionary algorithms for protein model refinement, in which multidimensional scaling(MDS), the MODELLER software, and a hybrid of both are used as crossover operators, respectively. The MDS-based method takes a purely geometrical approach and generates a child model by combining the contact maps of multiple parents. The MODELLER-based method takes a statistical and energy minimization approach, and uses the remodeling module in MODELLER program to generate new models from multiple parents. The hybrid method first generates models using the MDS-based method and then run them through the MODELLER-based method, aiming at combining the strength of both. Promising results have been obtained in experiments using CASP datasets. The MDS-based method improved the best of a pool of predicted models in terms of the global distance test score (GDT-TS) in 9 out of 16test targets.
机译:蛋白质结构预测,即从蛋白质的一级序列计算预测蛋白质的三维结构,是生物信息学中最重要和最具挑战性的问题之一。模型优化是预测过程中的关键步骤,在该过程中,将基于初始生成的模型池构建改进的结构。自从2008年将优化类别添加到两年一次的结构预测关键评估(CASP)以来,CASP结果表明,对于现有的模型优化方法而言,不断提高模型质量是一项挑战。本文提出了三种用于蛋白质模型改进的进化算法,其中多维缩放(MDS),MODELLER软件以及两者的混合分别用作交叉运算符。基于MDS的方法采用纯几何方法,并通过组合多个父级的联系图来生成子级模型。基于MODELLER的方法采用统计和能量最小化方法,并使用MODELLER程序中的重塑模块从多个父级生成新模型。混合方法首先使用基于MDS的方法生成模型,然后通过基于MODELLER的方法运行它们,以结合两者的优势。使用CASP数据集在实验中获得了可喜的结果。基于MDS的方法在16个测试目标中有9个的全球距离测试分数(GDT-TS)方面改进了一组最佳预测模型。

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