title: A directed protein interaction network for investigating intracellular signal transduction.
abstract: Cellular signal transduction is a complex process involving protein-protein interactions (PPIs) that transmit information. For example, signals from the plasma membrane may be transduced to transcription factors to regulate gene expression. To obtain a global view of cellular signaling and to predict potential signal modulators, we searched for protein interaction partners of more than 450 signaling-related proteins by means of automated yeast two-hybrid interaction mating. The resulting PPI network connected 1126 proteins through 2626 PPIs. After expansion of this interaction map with publicly available PPI data, we generated a directed network resembling the signal transduction flow between proteins with a naïve Bayesian classifier. We exploited information on the shortest PPI paths from membrane receptors to transcription factors to predict input and output relationships between interacting proteins. Integration of directed PPI with time-resolved protein phosphorylation data revealed network structures that dynamically conveyed information from the activated epidermal growth factor and extracellular signal-regulated kinase (EGF/ERK) signaling cascade to directly associated proteins and more distant proteins in the network. From the model network, we predicted 18 previously unknown modulators of EGF/ERK signaling, which we validated in mammalian cell-based assays. This generic experimental and computational approach provides a framework for elucidating causal connections between signaling proteins and facilitates the identification of proteins that modulate the flow of information in signaling networks.
authors: AG Neuroproteomics and Computational Biology and Data Mining Group, Max Delbrück Centrum for Molecular Medicine, Robert-Rössle-Strasse 10, D-13125 Berlin-Buch, Germany.
authors: Arunachalam
authors: A
authors: Vinayagam
authors: Ulrich
authors: U
authors: Stelzl
authors: Raphaele
authors: R
authors: Foulle
authors: Stephanie
authors: S
authors: Plassmann
authors: Martina
authors: M
authors: Zenkner
authors: Jan
authors: J
authors: Timm
authors: Heike E
authors: HE
authors: Assmus
authors: Miguel A
authors: MA
authors: Andrade-Navarro
authors: Erich E
authors: EE
authors: Wanker
mesh_terms: D001499:Bayes Theorem; D002450:Cell Communication / Q000502:physiology*; D019295:Computational Biology / Q000379:methods*; D004815:Epidermal Growth Factor / Q000378:metabolism; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D060066:Protein Interaction Maps / Q000235:genetics*; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology*; D014157:Transcription Factors / Q000378:metabolism; D020798:Two-Hybrid System Techniques
chemical_list: D014157:Transcription Factors; D004815:Epidermal Growth Factor; D048049:Extracellular Signal-Regulated MAP Kinases