Distinct roles of CpcG1 and CpcG2 in phycobilisome assembly in the cyanobacterium Synechocystis sp. PCC 6803 |
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| Authors: | Kumiko Kondo Xiao Xing Geng Mitsunori Katayama Masahiko Ikeuchi |
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| Institution: | (1) Department of Biological Science, Graduate School of Sciences, University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan;(2) Department of Life Sciences (Biology), University of Tokyo, Komaba, Meguro, Tokyo 153-8902, Japan |
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| Abstract: | Structural role of the second copy of the rod–core linker CpcG, which was found by genome analysis, was studied in Synechocystis sp. PCC 6803 by gene disruption and fractionation of phycobilisome (sub)complexes. Disruption of cpcG2 (sll1471) resulted in a marked decrease in phycocyanin content both in the background of wild-type and cpcG1 (slr2051)-disruptant. The unique phycocyanin rod–CpcG2 complex without the major allophycocyanin components was isolated from the cpcG1-disruptant. By fluorescence analysis, it was proposed that CpcG2 protein connects the rods with a minor allophycocyanin component, to support energy transfer to Photosystem I. |
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| Keywords: | CpcG cyanobacteria phycobilisome rod-core linker Synechocystis sp PCC 6803 |
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