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A Domain Combination-based Probabilistic Framework for Protein-Protein Interaction Prediction  

한동수 (한국정보통신대학원대학교 공학부)
서정민 (한국정보통신대학원대학교 공학)
김홍숙 (한국정보통신대학원대학교 공학)
장우혁 (한국정보통신대학원대학교 공학부)
Abstract
In this paper, we propose a probabilistic framework to predict the interaction probability of proteins. The notion of domain combination and domain combination pair is newly introduced and the prediction model in the framework takes domain combination pair as a basic unit of protein interactions to overcome the limitations of the conventional domain pair based prediction systems. The framework largely consists of prediction preparation and service stages. In the prediction preparation stage, two appearance probability matrices, which hold information on appearance frequencies of domain combination pairs in the interacting and non-interacting sets of protein pairs, are constructed. Based on the appearance probability matrix, a probability equation is devised. The equation maps a protein pair to a real number in the range of 0 to 1. Two distributions of interacting and non-interacting set of protein pairs are obtained using the equation. In the prediction service stage, the interaction probability of a Protein pair is predicted using the distributions and the equation. The validity of the prediction model is evaluated for the interacting set of protein pairs in Yeast organism and artificially generated non-interacting set of protein pairs. When 80% of the set of interacting protein pairs in DIP database are used as teaming set of interacting protein pairs, very high sensitivity(86%) and specificity(56%) are achieved within our framework.
Keywords
Protein-protein interaction; Domain combination; Domain combination pair; Prediction; model; AP matrix; Primary interaction probability;
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