Genome-wide high-throughput experiments, like two-hybrid screening, have
identified a large amount of putative protein-protein interactions (PPI)
and have lead to the creation of PPI networks. These networks, although
far from complete, provide us with a global view of the biochemical
processes in living organisms.
I present a survey of the current methods for analysing PPI networks,
focusing on the analysis of network topology. The decomposition of the PPI
into domain-domain interactions gives rise to a new type of networks which
require novel methods for analysis.