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arXiv 1809.04334q-bio.BMq-bio.QM
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蛋白质B因子和柔性的盲预测

Blind prediction of protein B-factor and flexibility

David Bramer, Guo-Wei Wei

摘要:

Debye-Waller因子是X射线衰减的一种度量,可以在蛋白质X射线晶体学中实验观察到。以前的理论模型在B因子分析中取得了很大的进展,通过从实验数据线性拟合蛋白质B因子。然而,未知蛋白质的B因子的盲预测是一个尚未解决的问题。该工作结合了机器学习和高级图论,即多尺度加权着色图(MWCG),对未知蛋白质的B因子进行盲预测。MWCG是测量由于蛋白质结构而导致的内在柔性的局部特征。连接不同蛋白质的B因子的全局特征,例如,X射线晶体学的分辨率,引入,使交叉蛋白质B因子的预测。在本工作中考虑了几种机器学习方法,包括集成方法和深度学习。所提出的方法进行了验证与数十万的实验B因子。大量的数值结果表明,从本方法得到的盲B-因子预测是更准确的比最小二乘拟合使用传统的方法。

英文摘要:

Debye-Waller factor, a measure of X-ray attenuation, can be experimentally observed in protein X-ray crystallography. Previous theoretical models have made strong inroads in the analysis of B-factors by linearly fitting protein B-factors from experimental data. However, the blind prediction of B-factors for unknown proteins is an unsolved problem. This work integrates machine learning and advanced graph theory, namely, multiscale weighted colored graphs (MWCGs), to blindly predict B-factors of unknown proteins. MWCGs are local features that measure the intrinsic flexibility due to a protein structure. Global features that connect the B-factors of different proteins, e.g., the resolution of X-ray crystallography, are introduced to enable the cross-protein B-factor predictions. Several machine learning approaches, including ensemble methods and deep learning, are considered in the present work. The proposed method is validated with hundreds of thousands of experimental B-factors. Extensive numerical results indicate that the blind B-factor predictions obtained from the present method are more accurate than the least squares fittings using traditional methods.

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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