Bacteriochlorophyll interaction with singlet oxygen in membranes of purple photosynthetic bacteria: does the protective function of carotenoids exist?

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Abstract

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

About the authors

Z. K. Makhneva

Institute of Basic Biological Problems of the Russian Academy of Sciences

Email: AshikhminAA@gmail.com
Russian Federation, 2, Institutskaya street, Pushchino, Moscow Region, 142290

A. A. Ashikhmin

Institute of Basic Biological Problems of the Russian Academy of Sciences

Author for correspondence.
Email: AshikhminAA@gmail.com
Russian Federation, 2, Institutskaya street, Pushchino, Moscow Region, 142290

M. A. Bolshakov

Institute of Basic Biological Problems of the Russian Academy of Sciences

Email: AshikhminAA@gmail.com
Russian Federation, 2, Institutskaya street, Pushchino, Moscow Region, 142290

A. A. Moskalenko

Institute of Basic Biological Problems of the Russian Academy of Sciences

Email: andrey-moskalenko@rambler.ru
Russian Federation, 2, Institutskaya street, Pushchino, Moscow Region, 142290

References

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