Sorbitol regulates energy transfer from allophycocyanin to the terminal emitter within phycobilisomes in <Emphasis Type="Italic">Synechocystis</Emphasis> sp |
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Authors: | Xingguo Liu Jingjing Zhao Qingyu Wu |
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Institution: | (1) Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing, 100084, China |
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Abstract: | The effects of sorbitol on energy transfer of phycobilisomes (PBSs) in vivo were investigated in a chlN deletion mutant of Synechocystis sp. PCC 6803. When the mutant was grown in the dark, it contained intact and functional PBSs but essentially no chlorophyll
or photosystems. Therefore, the structural and functional changes of the mutant PBSs in vivo can be detected by measurement
of low temperature (77 K) and room temperature fluorescence emission spectra. Our results, for the first time, demonstrate
that sorbitol decreases the energy transfer from allophycocyanin to the terminal emitter, indicating the site for osmotic
regulation of excitation transfer in PBSs. |
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Keywords: | Cyanobacterium Fluorescence emission Osmotic stress Phycobilisome Synechocystis sp PCC 6803 |
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