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Influence des paramètres environnementaux sur la biosynthèse d’éthers de glycérol bactériens : étude de modèles biologiques et exemples d’applications (paléo)environnementales

Abstract : Some Bacteria synthesize particular phospholipids, called glycerol ether lipids (AGE) which have a chemical structure at the intersection of the Bacteria and Archea domains. The singular nature of these lipids and their thermostable chemical structure allow them to be well preserved in the environment following bacterial lysis, and suggest their potential to constitute good biogeochemical and/or environmental biomarkers. However, very little information is currently available concerning the modes of formation and the role of AGEs in bacterial membranes. In this thesis, we studied the lipid composition of various pure strains of anaerobic sulfate-reducing bacteria able to synthesize AGEs, grown under various controlled conditions of temperature, pH and salinity. Various structural modifications of AGE were observed in response to variations in growth conditions, some of which being specific to, and linearly correlated with, changes in temperature or salinity. The results demonstrate the involvement of AGEs in membrane adaptation to changes in the physico-chemical conditions, and suggest the use of the structural distribution of AGEs in natural samples as an indicator of environmental conditions. The analysis of the AGE content of samples from different actual and past ecosystems, allowed confirming the potential of AGEs to be used as indicators of variations of (paleo)environmental conditions
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https://tel.archives-ouvertes.fr/tel-01801977
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Submitted on : Monday, May 28, 2018 - 7:49:05 PM
Last modification on : Tuesday, February 18, 2020 - 3:54:02 PM
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  • HAL Id : tel-01801977, version 1

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Arnauld Vinçon-Laugier. Influence des paramètres environnementaux sur la biosynthèse d’éthers de glycérol bactériens : étude de modèles biologiques et exemples d’applications (paléo)environnementales. Sciences de la Terre. Université de Lyon, 2017. Français. ⟨NNT : 2017LYSE1081⟩. ⟨tel-01801977⟩

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