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Bacterial ice-nucleating proteins (INPs) aggregate through electrostatic interactions, enhancing their ice nucleation efficiency. This aggregation is pH-dependent, crucial for bacterial ice formation under stress.

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Area of Science:

  • Microbiology
  • Biophysics
  • Materials Science

Background:

  • Bacterial ice-nucleating proteins (INPs) are highly efficient at promoting ice formation.
  • Their high activity is linked to the formation of functional INP aggregates.
  • The precise mechanism of INP activity remains incompletely understood.

Purpose of the Study:

  • To investigate the role of electrostatic interactions in the ice nucleation activity of INPs from *Pseudomonas syringae*.
  • To correlate the charge state of INPs with their ice nucleation efficiency.
  • To elucidate the mechanism behind the formation of active INP aggregates.

Main Methods:

  • Utilized a high-throughput ice nucleation assay.
  • Employed surface-specific sum-frequency generation spectroscopy.
  • Determined the charge state of nonviable *P. syringae* across a range of pH values.

Main Results:

  • Ice nucleation activity of INP aggregates is strongly correlated with net charge, showing minimal activity at the isoelectric point.
  • INP monomer activity is less sensitive to pH changes compared to aggregates.
  • Interfacial water molecule alignment, indicative of charge state, directly relates to nucleation activity.

Conclusions:

  • Electrostatic interactions are essential for forming highly active, functionally aligned INP aggregates.
  • This mechanism explains how bacteria promote ice nucleation under stress conditions.
  • The findings provide insights into the molecular basis of bacterial ice nucleation.