ApcD is required for state transition but not involved in blue-light induced quenching in the cyanobacterium <Emphasis Type="Italic">Anabaena</Emphasis> sp. PCC7120 |
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Authors: | ChunXia Dong JinDong Zhao |
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Institution: | (1) State Key Lab of Protein and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing, 100871, China |
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Abstract: | Pbycobilisomes (PBS) are able to transfer absorbed energy to photosystem I and II, and the distribution of light energy between
two photosystems is regulated by state transitions. In this study we show that energy transfer from PBS to photosystem I (PSI)
requires ApcD. Cells were unable to perform state transitions in the absence of ApcD. The apcD mutant grows more slowly in light mainly absorbed by PBS, indicating that ApcD-dependent energy transfer to PSI is required
for optimal growth under this condition. The apcD mutant showed normal blue-light induced quenching, suggesting that ApcD is not required for this process and state transitions
are independent of blue-light induced quenching. Under nitrogen fixing condition, the growth rates of the wild type and the
mutant were the same, indicating that energy transfer from PBS to PSI in heterocysts was not required for nitrogen fixation.
Supported by the National Natural Science Foundation of China (Grant No. 30230040) and National High-Tech Research and Development
of China (Grant No. 2007AA021405) |
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Keywords: | cyanobacteria photosystem phycobilisome state transition |
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