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Cyclopropanation of unsaturated fatty acids and membrane rigidification improve the freeze-drying resistance of Lactococcus lactis subsp. lactis TOMSC161

  • Applied microbial and cell physiology
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Abstract

This work aimed at characterizing the biochemical and biophysical properties of the membrane of Lactococcus lactis TOMSC161 cells during fermentation at different temperatures, in relation to their freeze-drying and storage resistance. Cells were cultivated at two different temperatures (22 and 30 °C) and were harvested at different growth phases (from the middle exponential phase to the late stationary phase). Bacterial membranes were characterized by determining the fatty acid composition, the lipid phase transition, and the membrane fluidity. Cultivability and acidification activity losses of L. lactis were quantified after freezing, drying, and 3 months of storage. The direct measurement of membrane fluidity by fluorescence anisotropy was linked to lipid composition, and it was established that the cyclopropanation of unsaturated fatty acids with concomitant membrane rigidification during growth led to an increase in the freeze-drying and storage resistance of L. lactis. As expected, cultivating cells at a lower fermentation temperature than the optimum growth temperature induced a homeoviscous adaptation that was demonstrated by a lowered lipid phase transition temperature but that was not related to any improvement in freeze-drying resistance. L. lactis TOMSC161 was therefore able to develop a combined biochemical and biophysical response at the membrane level during fermentation. The ratio of cyclic fatty acids to unsaturated fatty acids (CFA/UFA) appeared to be the most relevant parameter associated with membrane rigidification and cell resistance to freeze-drying and storage. This study increased our knowledge about the physiological mechanisms that explain the resistance of lactic acid bacteria (LAB) to freeze-drying and storage stresses and demonstrated the relevance of complementary methods of membrane characterization.

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Acknowledgments

This work was supported by the Centre National Interprofessionnel de l’Economie Laitière (Paris, France). The authors thank Savoîcime for providing the reference strain.

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Authors and Affiliations

  1. CNIEL, 42 rue de Châteaudun, 75014, Paris, France

    H. Velly

  2. INRA, UMR 782 Génie et Microbiologie des Procédés Alimentaires (GMPA), Avenue Lucien Brétignières, 78850, Thiverval-Grignon, France

    H. Velly, M. Bouix, S. Passot, C. Penicaud, H. Beinsteiner, S. Ghorbal, P. Lieben & F. Fonseca

  3. AgroParisTech, UMR 782 Génie et Microbiologie des Procédés Alimentaires (GMPA), Avenue Lucien Brétignières, 78850, Thiverval-Grignon, France

    H. Velly, M. Bouix, S. Passot, C. Penicaud, S. Ghorbal, P. Lieben & F. Fonseca

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  1. H. Velly
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Velly, H., Bouix, M., Passot, S. et al. Cyclopropanation of unsaturated fatty acids and membrane rigidification improve the freeze-drying resistance of Lactococcus lactis subsp. lactis TOMSC161. Appl Microbiol Biotechnol 99, 907–918 (2015). https://doi.org/10.1007/s00253-014-6152-2

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