A Discriminative Method for Protein Remote Homology Detection Based on N-nary Profiles

  • Bin Liu
  • Lei Lin
  • Xiaolong Wang
  • Qiwen Dong
  • Xuan Wang
Part of the Communications in Computer and Information Science book series (CCIS, volume 13)

Abstract

Protein homology detection is a key problem in computational biology. In this paper, a novel building block for protein called N-nary profile which contains the evolutionary information of protein sequence frequency profiles has been presented. The protein sequence frequency profiles calculated from the multiple sequence alignments outputted by PSI-BLAST are converted into N-nary profiles. Such N-nary profiles are filtered by a feature selection algorithm called chi-square algorithm. The protein sequences are transformed into fixed-dimension feature vectors by the occurrence times of each N-nary profile and then the corresponding vectors are inputted to support vector machine (SVM). The latent semantic analysis (LSA) model, an efficient feature extraction algorithm, is adopted to further improve the performance of this method. When tested on the SCOP 1.53 data set, the prediction performance of N-nary profile method outperforms all compared methods of protein remote homology detection. The ROC50 score is 0.736, which is higher than the current best method for nearly 4 percent.

Keywords

remote homology N-nary profiles chi-square algorithm latent semantic analysis 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Bin Liu
    • 1
  • Lei Lin
    • 2
  • Xiaolong Wang
    • 1
    • 2
  • Qiwen Dong
    • 2
  • Xuan Wang
    • 1
  1. 1.Shenzhen Graduate SchoolHarbin Institute of TechnologyShenzhenChina
  2. 2.School of Computer Science and TechnologyHarbin Institute of TechnologyHarbinChina

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