Article Dans Une Revue Organic Geochemistry Année : 2026

Effect of temperature on membrane lipids of Pseudomonas veronii isolated from French alpine lakes

Résumé

3-hydroxy fatty acids (3-OH FAs) produced by Gram-negative bacteria were recently proposed as promising temperature proxies. Nevertheless, the lipid adaptation mechanism of such microorganisms to temperature remains largely unexplored. Here, we investigated how growth temperature (5–25°C) affects lipid profiles of non-hydroxylated (non-OH) and 3-OH FAs in two Pseudomonas veronii strains isolated from French alpine lakes. Membrane adaptation to rising temperatures was mainly driven by non-OH-FAs, characterised by a higher saturated/unsaturated ratio, while 3-OH FA total proportion slightly increased from 12 to 15% of total FAs. FA profiles showed a non-linear response, with minor changes between 5 and 18°C cultivation temperature and a marked shift at 25°C, as well as slight differences between the two isolates. Our findings illustrate varied lipid response to temperature with potential implications in using 3-OH FAs as temperature proxies in lakes.

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hal-05557886 , version 1 (24-03-2026)

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Juanita Mora-Gomez, Sylvie Collin, Adrienne Kish, Christelle Anquetil, Marcelino Suzuki, et al.. Effect of temperature on membrane lipids of Pseudomonas veronii isolated from French alpine lakes. Organic Geochemistry, 2026, 217, pp.105189. ⟨10.1016/j.orggeochem.2026.105189⟩. ⟨hal-05557886⟩
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