Prediction of Protein-Protein Interactions Based on Protein-Protein Correlation Using Least Squares Regression

Author(s): De-Shuang Huang, Lei Zhang, Kyungsook Han, Suping Deng, Kai Yang, Hongbo Zhang

Journal Name: Current Protein & Peptide Science

Volume 15 , Issue 6 , 2014

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In order to transform protein sequences into the feature vectors, several works have been done, such as computing auto covariance (AC), conjoint triad (CT), local descriptor (LD), moran autocorrelation (MA), normalized moreaubroto autocorrelation (NMB) and so on. In this paper, we shall adopt these transformation methods to encode the proteins, respectively, where AC, CT, LD, MA and NMB are all represented by ‘+’ in a unified manner. A new method, i.e. the combination of least squares regression with ‘+’ (abbreviated as LSR+), will be introduced for encoding a protein-protein correlation-based feature representation and an interacting protein pair. Thus there are totally five different combinations for LSR+, i.e. LSRAC, LSRCT, LSRLD, LSRMA and LSRNMB. As a result, we combined a support vector machine (SVM) approach with LSR+ to predict protein-protein interactions (PPI) and PPI networks. The proposed method has been applied on four datasets, i.e. Saaccharomyces cerevisiae, Escherichia coli, Homo sapiens and Caenorhabditis elegans. The experimental results demonstrate that all LSR+ methods outperform many existing representative algorithms. Therefore, LSR+ is a powerful tool to characterize the protein-protein correlations and to infer PPI, whilst keeping high performance on prediction of PPI networks.

Keywords: Least square regression, protein-protein correlation, protein-protein interactions, protein sequences, SVM.

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Article Details

Year: 2014
Published on: 17 August, 2014
Page: [553 - 560]
Pages: 8
DOI: 10.2174/1389203715666140724084019
Price: $65

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