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Heterogeneous water dynamics in hyaluronan-DPPC interfaces.

Anirban Paul1, Jaydeb Chakrabarti1,2

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This summary is machine-generated.

Hyaluronic acid (HA) interactions with water and lipids affect cell mechanics. Molecular dynamics reveal water dynamics at the HA-lipid interface show heterogeneity, with diffusion influenced by HA concentration but not chain length.

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Area of Science:

  • Biophysics
  • Materials Science
  • Computational Biology

Background:

  • Hyaluronic acid (HA) is crucial for cellular structure and function, interacting synergistically with lipids and water.
  • Altered HA properties are linked to diseases like colon cancer and osteoarthritis, affecting cell mechanics.
  • Microscopic dynamics at the HA-water and lipid interface are not well understood.

Purpose of the Study:

  • To investigate the dynamic properties of water molecules at the interface between hyaluronic acid (HA) and a dipalmitoylphosphatidylcholine (DPPC) lipid bilayer.
  • To elucidate the influence of HA concentration and chain length on water dynamics at the molecular level.

Main Methods:

  • Utilized molecular dynamics (MD) simulations to model the HA-DPPC lipid bilayer system.
  • Analyzed interfacial and hydration water dynamics using non-Gaussian self van Hove functions.
  • Examined translational and rotational dynamics through diffusivity distributions.

Main Results:

  • Interfacial and hydration water exhibit dynamic heterogeneity, indicated by non-Gaussian self van Hove functions.
  • Diffusivity distributions show distinct translational and rotational dynamics between interfacial and hydration water.
  • Water diffusion coefficients at the interface decrease with increasing HA concentration but show weak dependence on HA chain length.
  • Water dynamics in the subdiffusive hydration layer are minimally affected by HA presence.

Conclusions:

  • The study reveals significant dynamic heterogeneity of water at the HA-lipid interface.
  • HA concentration is a key factor modulating water diffusion at the interface, while chain length has a lesser impact.
  • These findings provide molecular-level insights into HA's role in cellular mechanics and disease states.