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Macromolecular crowding has minimal impact on immunoglobulin G (IgG) flexibility but alters its diffusion and binding kinetics. Crowders slow IgG diffusion less than expected, affecting binding steps.

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Area of Science:

  • Biophysics
  • Immunology
  • Computational Biology

Background:

  • Immunoglobulin G (IgG) is crucial for immune response in extracellular fluids.
  • Limited research exists on IgG-antigen binding dynamics under physiological crowding.

Purpose of the Study:

  • To investigate the effects of macromolecular crowding on IgG dynamics and binding kinetics.
  • To develop a minimal coarse-grained model for IgG simulations.

Main Methods:

  • Developed a six-bead coarse-grained IgG model.
  • Utilized Brownian dynamics simulations.
  • Compared IgG diffusion and flexibility with and without crowders.

Main Results:

  • Macromolecular crowding slightly affects IgG flexibility.
  • Crowders reduce IgG translational diffusion less than expected, possibly due to conformational changes.
  • Crowding decreases the rate of the first IgG-antigen binding step and enhances the second.

Conclusions:

  • IgG's flexibility is robust to macromolecular crowding.
  • Crowding influences IgG diffusion and binding kinetics in complex ways.
  • The developed IgG model accurately captures flexibility and diffusion properties.