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<p>This study focused on how carotenoid pigments in bacteria attached to phytoplankton protect them from singlet oxygen produced by phytoplankton during senescence, specifically under illumination of the diatom <i>Thalassiosira</i> sp. Its effect was analyzed on bacterial membrane structure (photooxidation of bacterial membrane lipids such as mono-unsaturated fatty acids (MUFAs) and on DNA repair system in two bacterial species, non-pigmented <i>Pseudomonas stutzeri</i> and pigmented <i>Dinoroseobacter shibae</i>. In <i>P. stutzeri</i> cells, <sup><i>1</i></sup><i>O₂</i> transferred from phytodetritus was not completely scavenged by bacterial membranous MUFAs and reached the cytoplasm, allowing both <sup><i>1</i></sup><i>O₂</i> and UV radiation to cause a rapid response of DNA repair systems. In <i>D. shibae,</i> scavenging by bacterial membrane MUFAs and quenching by spheroidenone allowed only a small fraction of <sup><i>1</i></sup><i>O₂</i> to reach the cytoplasm, as shown by a delayed and lower repair system activation. The fact that Rhodobacteriales is the dominant order in bacterioplankton communities associated with algal blooms could thus be partly due to the protective effect of its constituent carotenoids against <sup><i>1</i></sup><i>O₂-</i> and UV-induced damage.</p>

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Do carotenoids protect phytodetritus-associated bacteria from oxidative stress?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月8日

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  • Gwénola Simon,
  • Laurie Casalot,
  • Corinne Valette,
  • Christopher Burot,
  • Jean François Rontani,
  • Patricia Bonin

摘要

This study focused on how carotenoid pigments in bacteria attached to phytoplankton protect them from singlet oxygen produced by phytoplankton during senescence, specifically under illumination of the diatom Thalassiosira sp. Its effect was analyzed on bacterial membrane structure (photooxidation of bacterial membrane lipids such as mono-unsaturated fatty acids (MUFAs) and on DNA repair system in two bacterial species, non-pigmented Pseudomonas stutzeri and pigmented Dinoroseobacter shibae. In P. stutzeri cells, 1O₂ transferred from phytodetritus was not completely scavenged by bacterial membranous MUFAs and reached the cytoplasm, allowing both 1O₂ and UV radiation to cause a rapid response of DNA repair systems. In D. shibae, scavenging by bacterial membrane MUFAs and quenching by spheroidenone allowed only a small fraction of 1O₂ to reach the cytoplasm, as shown by a delayed and lower repair system activation. The fact that Rhodobacteriales is the dominant order in bacterioplankton communities associated with algal blooms could thus be partly due to the protective effect of its constituent carotenoids against 1O₂- and UV-induced damage.