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Published on: March 10, 2015
Molecular Simulation of Oncostatin M and Receptor (OSM-OSMR) Interaction as a Potential Therapeutic Target for
Qingqing Du1, Yan Qian1, Weiwei Xue2
1Department of Pharmacy, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China.
Abstract:
Therapeutics targeting cytokines such as the oncostatin M (OSM)-mediated inflammation represent a potential strategy for the treatment of inflammatory bowel disease (IBD). Despite the investigation of the specific role of the interactions between OSM and the receptor (OSMR) in IBD pathogenesis, the 3D structure of the OSM-OSMR complex remains elusive. In this work, the interaction mode between OSM and OSMR at atomic level was predicted by computational simulation approach. The interaction domain of the OSMR was built with the homology modeling method. The near-native structure of the OSM-OSMR complex was obtained by docking, and long-time scale molecular dynamics (MD) simulation in an explicit solvent was further performed to sample the conformations when OSM binds to the OSMR. After getting the equilibrated states of the simulation system, per-residue energy contribution was calculated to characterize the important residues for the OSM-OSMR complex formation. Based on these important residues, eight residues (OSM: Arg100, Leu103, Phe160, and Gln161; OSMR: Tyr214, Ser223, Asp262, and Trp267) were identified as the "hot spots" through computational alanine mutagenesis analysis and verified by additional MD simulation of R100A (one of the identified "hotspots") mutant. Moreover, six cavities were detected at the OSM-OSMR interface through the FTMap analysis, and they were suggested as important binding sites. The predicted 3D structure of the OSM-OSMR complex and the identified "hot spots" constituting the core of the binding interface provide helpful information in understanding the OSM-OSMR interactions, and the detected sites serve as promising targets in designing small molecules to block the interactions.
Insights
Computational simulations reveal the 3D structure of the oncostatin M (OSM) and its receptor (OSMR) complex. Key "hot spot" residues and binding sites were identified, offering targets for inflammatory bowel disease (IBD) therapeutics.
Area of Science:
- Biochemistry
- Structural Biology
- Computational Biology
Background:
- Oncostatin M (OSM) and its receptor (OSMR) interactions are implicated in inflammatory bowel disease (IBD) pathogenesis.
- The precise 3D structure of the OSM-OSMR complex is currently unknown, limiting therapeutic development.
Purpose of the Study:
- To predict the atomic-level interaction mode of the OSM-OSMR complex using computational methods.
- To identify key residues and binding sites within the OSM-OSMR interface for potential therapeutic targeting.
Main Methods:
- Homology modeling was used to construct the OSMR interaction domain.
- Molecular docking and long-timescale molecular dynamics (MD) simulations were employed to determine the complex structure.
- Computational alanine mutagenesis and FTMap analysis were performed to identify critical residues and binding pockets.
Main Results:
- A near-native 3D structure of the OSM-OSMR complex was successfully predicted.
- Eight key residues (hot spots) and six cavities at the interface were identified as crucial for complex formation.
- The computational alanine mutagenesis of a specific residue (R100A) was validated through additional MD simulations.
Conclusions:
- The predicted 3D structure and identified hot spots provide valuable insights into OSM-OSMR interactions.
- The detected binding sites represent promising targets for designing small molecules to inhibit OSM-OSMR signaling in IBD.
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