Characterization of airborne ice-nucleation-active bacteria and bacterial fragments
By Tina Šantl-Temkiv, Maher Sahyoun, K. Finster, S. Hartmann, S. Augustin-Bauditz, F. Stratmann, H. Wex, T. Clauss, Niels W. Nielsen, J. H. Sørensen and 3 more. 2015
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Some bacteria have the unique capacity of synthesising ice-nucleation-active (INA) proteins and exposing them at their outer membrane surface. As INA bacteria enter the atmosphere, they may impact the formation of clouds and precipitation. We studied members of airborne bacterial communities for their capacity to catalyse ice formation and we report on the excretion of INA proteins by airborne Pseudomonas sp. We also observed for the first time that INA biological fragments <220nm were present in precipitation samples (199 and 482 INA fragments per L of precipitation), which confirms the presence of submicron INA biological fragments in the atmosphere. During 14 precipitation events, strains affiliated with the genus Pseudomonas, which are known to carry ina genes, were dominant. A screening for INA properties revealed that ~12% of the cultivable bacteria caused ice formation at ≤-7°C. They had likely been emitted to the atmosphere from terrestrial surfaces, e.g. by convective transport. We tested the ability of isolated INA strains to produce outer membrane vesicles and found that two isolates could do so. However, only very few INA vesicles were released per INA cell. Thus, the source of the submicron INA proteinaceous particles that we detected in the atmosphere remains to be elucidated. (Less)
Subfields: Atmospheric Science, Ecology
View Paper: https://www.semanticscholar.org/paper/346fdd348f604e30a16f4780bfd142b05e125790
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Citations in the corpus
- The adsorption of fungal ice-nucleating proteins on mineral dusts: a terrestrial reservoir of atmospheric ice-nucleating particles (2016, background): “Currently, there is a growing awareness that subcellular biological fragments from organisms, such as bacteria, pollen and fungi may be important atmospheric INPs (O’Sullivan et al., 2015; Pummer et al., 2012, 2015; Augustin et al., 2013; Fröhlich-Nowoisky et al., 2015; Šantl-Temkiv et al., 2015; Ra”
- Ice nucleation by water-soluble macromolecules (2014, background): “Recently, the presence of nanosized biological particles with INA were detected in precipitation (Santl-Temkiv et al., 2015) and soil (O’Sullivan et al., 2015).”