arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.08149q-bio.BMcs.CGcs.LG
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Site2Vec:一种用于蛋白质-配体结合位点向量嵌入的参考框架不变算法

Site2Vec: a reference frame invariant algorithm for vector embedding of protein-ligand binding sites

IIT Tirupati(印度蒂鲁帕蒂理工学院)

Arnab Bhadra, Kalidas Y

摘要:

蛋白质与配体相互作用是生命系统中分子相互作用的基本类型之一。配体是在蛋白质分子表面称为结合位点的特定区域与蛋白质分子相互作用的小分子。诸如蛋白质功能相似性的评估和药物副作用的检测等任务需要鉴定跨不同途径的不同蛋白质的相似结合位点。用于相似性评估的机器学习方法需要结合位点的特征描述符。基于手工设计的图案和原子配置的传统方法不能在数千个站点上扩展。在这方面,现在部署了可以捕获非常复杂的输入特征空间的深度神经网络算法。然而,将深度学习应用于结合位点结构的一个基本挑战是输入表示和参考框架。我们在这里报告一个新的算法Site 2 Vec,推导出参考框架不变的载体嵌入的蛋白质配体结合位点。该方法是基于代表点和化学组成的组成氨基酸的网站之间的成对距离。向量嵌入充当用于邻近查询和确定相似站点的局部敏感散列函数。该方法在10个数据集和23个其他站点比较方法的广泛基准研究中质量分数超过95%,表现最佳。该算法用于高通量处理,并已被评估为相对于参考帧移位,坐标扰动和残基突变的稳定性。我们提供Site 2 Vec作为一个独立的可执行文件和托管在\url{http://services.iittp.ac.in/bioinfo/home}的Web服务。

英文摘要:

Protein-ligand interactions are one of the fundamental types of molecular interactions in living systems. Ligands are small molecules that interact with protein molecules at specific regions on their surfaces called binding sites. Tasks such as assessment of protein functional similarity and detection of side effects of drugs need identification of similar binding sites of disparate proteins across diverse pathways. Machine learning methods for similarity assessment require feature descriptors of binding sites. Traditional methods based on hand engineered motifs and atomic configurations are not scalable across several thousands of sites. In this regard, deep neural network algorithms are now deployed which can capture very complex input feature space. However, one fundamental challenge in applying deep learning to structures of binding sites is the input representation and the reference frame. We report here a novel algorithm Site2Vec that derives reference frame invariant vector embedding of a protein-ligand binding site. The method is based on pairwise distances between representative points and chemical compositions in terms of constituent amino acids of a site. The vector embedding serves as a locality sensitive hash function for proximity queries and determining similar sites. The method has been the top performer with more than 95% quality scores in extensive benchmarking studies carried over 10 datasets and against 23 other site comparison methods. The algorithm serves for high throughput processing and has been evaluated for stability with respect to reference frame shifts, coordinate perturbations and residue mutations. We provide Site2Vec as a stand alone executable and a web service hosted at \url{http://services.iittp.ac.in/bioinfo/home}.

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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