Going the distance for protein function prediction: a new distance metric for protein interaction networks.

Going the distance for protein function prediction: a new distance metric for protein interaction networks.
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DOI:
10.1371/journal.pone.0076339
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Hescott B
Hescott B
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cao M;Zhang H;Park J;Daniels NM;Crovella ME;Cowen LJ;Hescott B

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在蛋白质-蛋白质相互作用(PPI)网络中,功能相似性通常是基于直接相互作用的蛋白质的功能来推断的,或者更一般地说,是基于局部邻域中蛋白质之间的相互作用网络接近度的概念。先前的方法通常将邻近度作为网络中的最短路径距离来测量,但这在捕获细粒度邻域区别方面的能力有限,因为大多数蛋白质彼此靠近,并且存在许多邻近关系。我们引入了扩散状态距离(DSD),这是一种基于图形扩散特性的新度量,旨在捕获PPI网络中功能注释传输附近的细粒度差异。我们提出了一个工具,当输入PPI网络时,将输出每对蛋白质之间的DSD距离。我们发现,用DSD代替最短路径度量可以全面提高经典函数预测方法的性能。
In protein-protein interaction (PPI) networks, functional similarity is often inferred based on the function of directly interacting proteins, or more generally, some notion of interaction network proximity among proteins in a local neighborhood. Prior methods typically measure proximity as the shortest-path distance in the network, but this has only a limited ability to capture fine-grained neighborhood distinctions, because most proteins are close to each other, and there are many ties in proximity. We introduce diffusion state distance (DSD), a new metric based on a graph diffusion property, designed to capture finer-grained distinctions in proximity for transfer of functional annotation in PPI networks. We present a tool that, when input a PPI network, will output the DSD distances between every pair of proteins. We show that replacing the shortest-path metric by DSD improves the performance of classical function prediction methods across the board.
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