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  Specific Ion‐Protein Interactions Influence Bacterial Ice Nucleation

Schwidetzky, R., Lukas, M., YazdanYar, A., Kunert, A. T., Pöschl, U., Domke, K. F., et al. (2021). Specific Ion‐Protein Interactions Influence Bacterial Ice Nucleation. Chemistry – A European Journal, 27. doi:10.1002/chem.202004630.

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Genre: Journal Article

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 Creators:
Schwidetzky, Ralph, Author
Lukas, Max, Author
YazdanYar, Azade, Author
Kunert, Anna T.1, Author              
Pöschl, Ulrich1, Author              
Domke, Katrin F., Author
Fröhlich-Nowoisky, Janine1, Author              
Bonn, Mischa, Author
Koop, Thomas, Author
Nagata, Yuki, Author
Meister, Konrad, Author
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: Ice nucleation‐active bacteria are the most efficient ice nucleators known, enabling the crystallization of water at temperatures close to 0 ˚C, and thereby overcoming the kinetically hindered phase transition process at these conditions. Using highly‐specialized ice‐nucleating proteins (INPs), they can cause frost damage to plants and influence the formation of clouds and precipitation in the atmosphere. In nature, the bacteria are usually found in aqueous environments containing ions. The impact of ions on bacterial ice nucleation efficiency, however, has remained elusive. Here we demonstrate that ions can profoundly influence the efficiency of bacterial ice nucleators in a manner that follows the Hofmeister series. Weakly hydrated ions inhibit bacterial ice nucleation, whereas strongly hydrated ions apparently facilitate ice nucleation. Surface‐specific sum‐frequency generation spectroscopy and molecular dynamics simulations reveal that the different effects are due to specific interactions of the ions with the INPs on the surface of the bacteria. Our results demonstrate that heterogeneous ice nucleation facilitated by bacteria is strongly dependent upon the nature of the ions, and specific ion‐protein interactions are essential for the complete description of heterogeneous ice nucleation by bacteria.

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Language(s): eng - English
 Dates: 2021-01-19
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/chem.202004630
 Degree: -

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Title: Chemistry – A European Journal
  Other : Chem. – Eur. J.
  Other : Chem. Eur. J.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 13 Volume / Issue: 27 Sequence Number: - Start / End Page: - Identifier: ISSN: 0947-6539
CoNE: https://pure.mpg.de/cone/journals/resource/954926979058