title: Protein-protein interaction based on pairwise similarity.
abstract: BACKGROUND
  Protein-protein interaction (PPI) is essential to most biological processes. Abnormal interactions may have implications in a number of neurological syndromes. Given that the association and dissociation of protein molecules is crucial, computational tools capable of effectively identifying PPI are desirable. In this paper, we propose a simple yet effective method to detect PPI based on pairwise similarity and using only the primary structure of the protein. The PPI based on Pairwise Similarity (PPI-PS) method consists of a representation of each protein sequence by a vector of pairwise similarities against large subsequences of amino acids created by a shifting window which passes over concatenated protein training sequences. Each coordinate of this vector is typically the E-value of the Smith-Waterman score. These vectors are then used to compute the kernel matrix which will be exploited in conjunction with support vector machines.
  
  
  RESULTS
  To assess the ability of the proposed method to recognize the difference between "interacted" and "non-interacted" proteins pairs, we applied it on different datasets from the available yeast saccharomyces cerevisiae protein interaction. The proposed method achieved reasonable improvement over the existing state-of-the-art methods for PPI prediction.
  
  
  CONCLUSIONS
  Pairwise similarity score provides a relevant measure of similarity between protein sequences. This similarity incorporates biological knowledge about proteins and it is extremely powerful when combined with support vector machine to predict PPI.
authors.affiliation: Bioinformatics Laboratory, Department of Computer Science, College of Information Technology, UAE University, Al Ain 17551, UAE. nzaki@uaeu.ac.ae
authors.forename: Nazar
authors.initials: N
authors.lastname: Zaki
authors.forename: Sanja
authors.initials: S
authors.lastname: Lazarova-Molnar
authors.forename: Wassim
authors.initials: W
authors.lastname: El-Hajj
authors.forename: Piers
authors.initials: P
authors.lastname: Campbell
mesh_terms: D000595:Amino Acid Sequence; D030562:Databases, Protein; D054730:Protein Interaction Domains and Motifs; D025941:Protein Interaction Mapping / Q000379:methods*; D040901:Proteomics / Q000379:methods*; D012372:ROC Curve; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D029701:Saccharomyces cerevisiae Proteins