A strategy for interaction site prediction between phospho-binding modules and their partners identified from
Willy Aucher1, Emmanuelle Becker, Emilie Ma
1Laboratoire du Métabolisme de l'ADN et Réponses aux Génotoxiques, Gif-sur-Yvette F-91191, France.
Molecular & Cellular Proteomics : MCP
|August 25, 2010
Summary
We developed STRIP, a computational tool to identify specific protein interaction sites. This method accurately predicts phospho-threonine binding sites, aiding in understanding complex protein networks.
Area of Science:
- Biochemistry
- Computational Biology
- Molecular Biology
Background:
- Proteomic technologies reveal extensive protein-protein interactions, forming complex networks.
- Dissecting these dense networks requires precise identification and disruption of specific interactions.
- Phospho-recognition modules mediate many protein interactions, often involving phosphorylated residues.
Purpose of the Study:
- To develop a computational strategy (STRIP) for predicting specific interaction sites within phospho-recognition module-substrate interactions.
- To validate the STRIP method using experimental techniques like yeast two-hybrid screening.
- To provide a tool for functional dissection of complex protein interaction networks.
Main Methods:
- Development of the STRIP computational strategy integrating conservation, phosphorylation likelihood, and binding specificity.
- Experimental validation using yeast two-hybrid screening with the ForkHead Associated (FHA)1 domain of Rad53.
- Site-directed mutagenesis of predicted threonine residues in identified interaction partners (Cdc7, Cdc45) to confirm binding disruption.
Main Results:
- STRIP successfully predicted interaction sites for phospho-recognition modules.
- The method identified 11 Rad53 binding partners, including Cdc7 and Cdc45.
- Experimental validation confirmed that mutating predicted threonine residues (T484 in Cdc7, T189 in Cdc45) abolished protein binding.
- Analysis of 63 known Rad53 partners provided insights into key interacting threonines.
Conclusions:
- The STRIP method accurately predicts specific phospho-threonine interaction sites.
- STRIP facilitates the functional analysis of complex protein interaction networks.
- The tool is available via a web interface for broader scientific application.
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