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The Topological Properties of Virus-Human Protein Interaction Networks

In the research of biological networks, it is an important problem how to use the quantity to identify essential protein-protein interactions. In this paper, a new definition "representative value of networks", denoted as " RV ", is presented and applied to analyze the topological properties of three protein-protein interaction networks. From calculation we find that the relationship between human protein-protein interactions is highly clustered, for example, the percentage of value of the top 20% proteins of representative value from high to low accounts for 71.96%. The virus-human protein interactions (i.e. virus attacks human) are selective. And the attack of the virus also has a high aggregation. These results show that the proposed new definition is reasonable and can be considered as an important index for analyzing the topological properties of biological networks.