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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Molecular dynamics simulation and steered molecular dynamics simulation on irisin dimers.

Qi Gao1,2, Chao Lu1, Xiao-Wen Wang1

  • 1College of Light Industry, Liaoning University, Shenyang, 110036, China.

Journal of Molecular Modeling
|March 18, 2018
PubMed
Summary

Irisin, a protein promoting beige fat browning, forms a dimer stabilized by van der Waals forces. Molecular dynamics simulations identified key residues essential for irisin dimer stability and dissociation.

Keywords:
Irisin dimerMolecular dynamics simulationProtein–protein interactionsSteered molecular dynamics simulation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Irisin is a myokine implicated in thermogenesis and energy expenditure.
  • Irisin promotes the browning of white adipose tissue into beige fat.
  • The crystal structure of irisin reveals a dimeric form stabilized by inter-subunit interactions.

Purpose of the Study:

  • To investigate the dissociation process and inter-monomer interactions of the irisin dimer.
  • To identify the key forces and residues responsible for irisin dimer stability.

Main Methods:

  • Molecular Dynamics (MD) simulations were employed to analyze monomer interactions.
  • Steered Molecular Dynamics (SMD) simulations were used to determine accurate interaction energies.
  • Analysis of hydrophobic contacts, H-bonds, and dissociation energy.

Main Results:

  • Van der Waals (vdW) forces were identified as the primary force maintaining the irisin dimer structure.
  • Eleven essential residues were identified through dissociation force analysis.
  • New important residues (Arg72, Leu74, Phe76, Gln78, Val80, Asp91) were discovered, alongside previously reported ones.

Conclusions:

  • Irisin dimer stability is primarily governed by van der Waals forces.
  • Specific residues, both newly identified and previously reported, play critical roles in irisin dimerization.
  • These findings provide insights into the structural basis of irisin function.