期刊
PLANTS-BASEL
卷 10, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/plants10071275
关键词
CP12; cyanobacteria; photo-oxidative stress; photosynthesis
The CP12 protein plays a crucial regulatory role in cyanobacteria, not only under dark conditions but also under light conditions. Gene-disrupted strains lacking CP12 are more sensitive to photo-oxidative stress and may be involved in protecting cells from oxidative stress by controlling the flow of electrons.
We previously reported that CP12 formed a complex with GAPDH and PRK and regulated the activities of these enzymes and the Calvin-Benson cycle under dark conditions as the principal regulatory system in cyanobacteria. More interestingly, we found that the cyanobacterial CP12 gene-disrupted strain was more sensitive to photo-oxidative stresses such as under high light conditions and paraquat treatment. When a mutant strain that grew normally under low light was subjected to high light conditions, decreases in chlorophyll and photosynthetic activity were observed. Furthermore, a large amount of ROS was accumulated in the cells of the CP12 gene-disrupted strain. These data suggest that CP12 also functions under light conditions and may be involved in protection against oxidative stress by controlling the flow of electrons from Photosystem I to NADPH.
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