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    Specific Ion–Protein Interactions Influence Bacterial Ice Nucleation

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    Konrad Meister_2021_Specific Ion ...
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    Author
    Schwidetzky, Ralph
    Lukas, Max
    YazdanYar, Dr. Azade
    Kunert, Dr. Anna T.
    Pöschl, Dr. Ulrich
    Domke, Katrin F.
    Fröhlich-Nowoisky, Dr. Janine
    Bonn, Prof Dr. Mischa
    Koop, Prof. Dr. Thomas
    Nagata, Dr. Yuki
    Meister, Konrad
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    Keyword
    ice nucleation
    crystallization
    spectroscopy
    bacteria
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    URI
    http://hdl.handle.net/11122/12855
    Abstract
    Ice nucleation-active bacteria are the most efficient ice nucleators known, enabling the crystallization of water at temperatures close to 0 °C, 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 strongly depends upon the nature of the ions, and specific ion–protein interactions are essential for the complete description of heterogeneous ice nucleation by bacteria.
    Date
    2021-01-19
    Publisher
    European Chemical Societies Publishing
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Schwidetzky, R., Lukas, M., YazdanYar, A., Kunert, A.T., Pöschl, U., Domke, K.F., Fröhlich-Nowoisky, J., Bonn, M., Koop, T., Nagata, Y. and Meister, K., 2021. Specific Ion‐Protein Interactions Influence Bacterial Ice Nucleation. Chemistry–A European Journal.
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    Meister, Konrad

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