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- W1992707039 abstract "To investigate the role of phosphatidylglycerol (PG) in photosynthesis, we constructed a mutant defective in the CDP-diacylglycerol synthase gene from a cyanobacterium, Synechocystis sp. PCC6803. The mutant, designated as SNC1, required PG supplementation for growth. Growth was repressed in PG-free medium concomitantly with the decrease in cellular content of PG. These results indicate that PG is essential, and that SNC1 is defective in PG synthesis. Decrease in PG content was accompanied by a reduction in the cellular content of chlorophyll, but with little effect on the contents of phycobilisome pigments, which showed that levels of chlorophyll–protein complexes decreased without alteration of those of phycobilisomes. Regardless of the decrease in the PG content, CO 2 -dependent photosynthesis by SNC1 was similar to that by the wild type on a chlorophyll basis, but consequently became lower on a cell basis. Simultaneously, the ratio of oxygen evolution of photosystem II (PSII) measured with p -benzoquinone to that of CO 2 -dependent photosynthesis, which ranged between 1.3 and 1.7 in the wild type. However, it was decreased in SNC1 from 1.3 to 0.4 during the early growth phase where chlorophyll content and CO 2 -dependent photosynthesis were little affected, and then finally to 0.1, suggesting that PSII first lost its ability to reduce p -benzoquinone and then decreased in its level and actual activity. These results indicate that PG contributes to the accumulation of chlorophyll–protein complexes in thylakoid membranes, and also to normal functioning of PSII." @default.
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- W1992707039 date "2000-09-12" @default.
- W1992707039 modified "2023-10-16" @default.
- W1992707039 title "Requirement of phosphatidylglycerol for photosynthetic function in thylakoid membranes" @default.
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- W1992707039 doi "https://doi.org/10.1073/pnas.97.19.10655" @default.
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