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Deciphering the Structural Effects of Activating EGFR Somatic Mutations with Molecular Dynamics Simulation
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Simulation Guided Design of a Potentially Hyperactive Ice Nucleating Protein.

Elio A Cino1, D Peter Tieleman1

  • 1Centre for Molecular Simulation and Department of Biological Sciences, University of Calgary, Calgary T2N 1N4, Canada.

Journal of Chemical Information and Modeling
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Ice nucleating proteins (INPs) efficiently catalyze ice formation. Molecular dynamics simulations revealed YGS and TxT motifs are key, leading to enhanced INP designs for biotechnology.

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Area of Science:

  • Biophysics
  • Materials Science
  • Protein Engineering

Background:

  • Ice nucleating proteins (INPs) are highly efficient biological catalysts for ice formation near 0 °C.
  • The precise molecular mechanisms governing INP nucleation efficiency, despite known β-helical repeats, remain incompletely understood.

Purpose of the Study:

  • To investigate ice nucleation mechanisms by a modeled *Pseudomonas syringae* INP using atomistic molecular dynamics simulations.
  • To identify key motifs responsible for ice nucleation and guide the design of enhanced INPs.

Main Methods:

  • Conducted extensive atomistic molecular dynamics (MD) simulations totaling 50 μs on a *Pseudomonas syringae* INP (inaV central repeat domain).
  • Analyzed simulation trajectories to pinpoint initiation sites and propagation of ice formation.
  • Designed and simulated a modified INP variant with doubled YGS and TxT motifs.

Main Results:

  • Ice nucleation was observed to initiate predominantly at YGS and TxT motifs, facilitating stable crystal formation.
  • The modified INP variant exhibited significantly faster nucleation kinetics ( *T*50 = 1.9 ± 0.4 μs) compared to wild-type (WT) (3.3 ± 1.8 μs).
  • The enhanced INP showed approximately 28.5% higher ice-like water fractions near the key YGS and TxT motifs.

Conclusions:

  • The YGS motif is identified as a critical element for organizing water molecules during ice nucleation.
  • Molecular dynamics-driven protein design is effective in enhancing INP performance.
  • Optimized INPs hold potential for energy-saving and biotechnological applications.