Abstract

The direct action of singlet oxygen on the bacteriochlorophyll (BChl) of light-harvesting complexes in the membranes of four species of purple non-sulfur and sulfur photosynthesizing bacteria with and without carotenoids was studied. It was found that BChl in carotenoidless samples is generally more resistant to the action of singlet oxygen compared to the control. It is assumed that carotenoids are not required to protect BChl of bacterial light-harvesting complexes from singlet oxygen, and in the classic work by Griffith et al. [1] the apoptosis process in carotenoidless mutant cells, which involves the destruction of complexes, the appearance of monomeric BChl, and the generation of singlet oxygen caused by BChl, followed by BChl oxidation, was mistakenly attributed to the protective function of carotenoids.

中文翻译：

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紫色光合细菌膜中细菌叶绿素与单线态氧的相互作用：类胡萝卜素的保护功能是否存在？

摘要

研究了单线态氧对四种含和不含类胡萝卜素的紫色非硫和硫光合作用细菌的膜上光捕获复合物细菌叶绿素（BChl）的直接作用。发现与对照相比，无类胡萝卜素样品中的BChl通常对单线态氧的作用更具抗性。假设不需要类胡萝卜素来保护细菌光捕获复合物的BChl免受单线态氧的影响，这是格里菲斯等人的经典著作。[1]无类胡萝卜素突变细胞的凋亡过程涉及复合物的破坏，单体BChl的出现以及由BChl引起的单线态氧的产生，随后BChl的氧化，被错误地归因于类胡萝卜素的保护功能。