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Specificity and Stability in Topology of Protein Networks
Sergei Maslov,1Kim Sneppen2
Molecular networks guide the biochemistry of a living
cell on multiple levels: Its metabolic and signaling pathways are
shapedby the network of interacting proteins, whose production, in
turn,is controlled by the genetic regulatory network. To address
topologicalproperties of these two networks, we quantified
correlations betweenconnectivities of interacting nodes and compared
them to a nullmodel of a network, in which all links were randomly
rewired.We found that for both interaction and regulatory networks,
linksbetween highly connected proteins are systematically suppressed,whereas those between a highly connected and low-connected pairsof
proteins are favored. This effect decreases the likelihoodof cross
talk between different functional modules of the celland increases the
overall robustness of a network by localizingeffects of deleterious
perturbations.
1 Department of Physics, Brookhaven National
Laboratory, Upton, NY 11973, USA.
2 Department of
Physics, Norwegian University of Science and Technology, N-7491
Trondheim, Norway.
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