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Constructing sequence‐dependent protein models using coevolutionary information

机译:使用协同进化信息构建依赖序列的蛋白质模型

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摘要

Recent developments in global statistical methodologies have advanced the analysis of large collections of protein sequences for coevolutionary information. Coevolution between amino acids in a protein arises from compensatory mutations that are needed to maintain the stability or function of a protein over the course of evolution. This gives rise to quantifiable correlations between amino acid sites within the multiple sequence alignment of a protein family. Here, we use the maximum entropy‐based approach called mean field Direct Coupling Analysis (mfDCA) to infer a Potts model Hamiltonian governing the correlated mutations in a protein family. We use the inferred pairwise statistical couplings to generate the sequence‐dependent heterogeneous interaction energies of a structure‐based model (SBM) where only native contacts are considered. Considering the ribosomal S6 protein and its circular permutants as well as the SH3 protein, we demonstrate that these models quantitatively agree with experimental data on folding mechanisms. This work serves as a new framework for generating coevolutionary data‐enriched models that can potentially be used to engineer key functional motions and novel interactions in protein systems.
机译:全球统计方法学的最新发展促进了蛋白质序列大集合的分析,从而获得了协同进化信息。蛋白质中氨基酸之间的共同进化源自在进化过程中维持蛋白质的稳定性或功能所需的补偿性突变。这引起蛋白质家族的多序列比对内的氨基酸位点之间的可量化的相关性。在这里,我们使用称为平均场直接耦合分析(mfDCA)的基于熵的最大方法来推断控制蛋白质家族中相关突变的Potts模型哈密顿量。我们使用推断的成对统计耦合来生成仅考虑天然接触的基于结构的模型(SBM)的依赖序列的异质相互作用能。考虑到核糖体S6蛋白及其环状排列以及SH3蛋白,我们证明这些模型在定量上与折叠机制的实验数据吻合。这项工作为生成协同进化的数据丰富的模型提供了新的框架,该模型可潜在地用于工程化蛋白质系统中的关键功能运动和新型相互作用。

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