Structural Insights into the IL12:IL12 Receptor Complex Assembly by Molecular Modeling, Docking, and Molecular...

Area of Science:

• Structural biology
• Computational chemistry
• Immunology

Background:

• Interleukin-12 receptor (IL12R) is a type I cytokine receptor crucial for hematopoiesis and immune regulation.
• IL12R binds the IL12 ligand, activating signaling pathways essential for hematopoietic progenitor cell development.
• The precise structure of the IL12:IL12R complex remains unknown.

Purpose of the Study:

• To develop a de novo computational method for rational protein design.
• To elucidate the molecular structure of the IL12:IL12R complex.

Main Methods:

• Utilized homology modeling, molecular docking, and molecular dynamics (MD) simulations.
• Predicted and validated the 3D structure of the IL12R protein, identifying key domains and motifs.
• Analyzed the binding interface and energy of the IL12:IL12R complex.

Main Results:

• Confirmed the accurate structure of IL12R, including immunoglobulin, fibronectin type III, and cytokine-binding domains, plus the WSXWS motif.
• Molecular docking and MD simulations revealed a tight binding interaction between IL12 and IL12R.
• The docked complex exhibited a binding energy of -26.7 kcal/mol and an interface area of 281.4 Ų.
• Identified specific interacting residues on both IL12 and IL12R.

Conclusions:

• Generated a simulated molecular structure for the IL12:IL12R complex.
• This simulated complex serves as a promising target for advancing IL12-based drug design strategies.