Conformational transitions in eosinophil cationic protein: a molecular dynamics study in aqueous environment

Area of Science:

• Biophysics
• Computational Biology
• Structural Biology

Background:

• Eosinophil cationic protein (ECP) is a key mediator in allergic inflammation.
• Understanding ECP's structural dynamics is crucial for therapeutic target identification.

Purpose of the Study:

• To investigate the conformational dynamics of ECP using molecular dynamics simulations.
• To analyze the role of water molecules and hydrogen bonding in ECP's structural transitions.

Main Methods:

• Extensive molecular dynamics simulations of ECP dimer structures (ECPA and ECPB).
• Analysis of sidechain hydrogen bonds, protein-water networks, and water residence times.
• Comparison of conformational differences between ECPA and ECPB simulations.

Main Results:

• ECPB simulations reached a stable equilibrium conformation.
• ECPA simulations showed conformational transitions involving solvent molecules and pore-like structures.
• Significant differences in protein-water interactions were observed between N-terminal helix and C-terminal loop regions.

Conclusions:

• Initial structural variations in ECP can lead to distinct conformational pathways.
• Protein-water interactions play a critical role in mediating ECP conformational changes.
• Core structural features and hydration patterns remain conserved, suggesting intrinsic protein properties.