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Updated: Nov 25, 2025

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
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Interfacial Water Ordering Is Insufficient to Explain Ice-Nucleating Protein Activity.

Max Lukas1, Ralph Schwidetzky1, Anna T Kunert2

  • 1Max Planck Institute for Polymer Research, 55128 Mainz, Germany.

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|December 16, 2020
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Summary
This summary is machine-generated.

Bacterial ice-nucleating proteins (INPs) maintain their structure upon cooling but lose ice nucleation ability after heating. Intact INP structure, not just water ordering, is crucial for bacterial ice nucleation.

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Area of Science:

  • Biochemistry
  • Microbiology
  • Physical Chemistry

Background:

  • Ice-nucleating proteins (INPs) from bacteria are highly efficient at inducing water crystallization near 0 °C.
  • The precise mechanism behind INPs' potent ice nucleation activity remains incompletely understood.
  • Understanding INP function is key to applications in cryopreservation and weather modification.

Purpose of the Study:

  • To elucidate the structural dynamics of Pseudomonas syringae INPs in solution.
  • To determine the relationship between INP structure, thermal stability, and ice nucleation activity.
  • To investigate the role of protein structure versus water ordering in INP function.

Main Methods:

  • Solution structure analysis of INPs using spectroscopic techniques.
  • Thermal stress experiments to assess protein stability and activity loss.
  • Sum-frequency generation (SFG) spectroscopy to probe interfacial water structure.

Main Results:

  • INPs exhibit a stable solution structure that does not change significantly upon cooling.
  • Heating INPs above approximately 55 °C causes irreversible structural changes and loss of ice nucleation activity.
  • Both active and heat-inactivated INPs induce similar ordering of interfacial water molecules during cooling.

Conclusions:

  • Increased water ordering at the protein interface is insufficient to explain high ice nucleation activity.
  • The integrity of the three-dimensional protein structure is essential for bacterial ice nucleation.
  • Bacterial ice nucleation likely relies on supramolecular interactions mediated by intact INPs.