scholarly journals Spectroscopy of Single Light-Harvesting Complexes from Purple Photosynthetic Bacteria at 1.2 K

1998 ◽  
Vol 102 (47) ◽  
pp. 9363-9366 ◽  
Author(s):  
A. M. van Oijen ◽  
M. Ketelaars ◽  
J. Köhler ◽  
T. J. Aartsma ◽  
J. Schmidt
Keyword(s):  
Photosynthetic Bacteria ◽  
Light Harvesting ◽  
Light Harvesting Complexes ◽  
Purple Photosynthetic Bacteria

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

2019 ◽  
Vol 486 (4) ◽  
pp. 504-508
Author(s):  
Z. K. Makhneva ◽  
A. A. Ashikhmin ◽  
M. A. Bolshakov ◽  
A. A. Moskalenko
Keyword(s):  
Singlet Oxygen ◽  
Photosynthetic Bacteria ◽  
Light Harvesting ◽  
Direct Action ◽  
Light Harvesting Complexes ◽  
Protective Function ◽  
Classic Work ◽  
Purple Photosynthetic Bacteria ◽  
Apoptosis Process ◽  
Mutant Cells

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.

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