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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Awai, Koichiro Sato, Naoki Ohta, Hiroyuki |
| Description | Author Affiliation: Awai K ( Graduate School of Science, Shizuoka University, Shizuoka 422-8529, Japan); Ohta H ( Center for Biological Resources and Informatics, Tokyo Institute of Technology, Yokohama 226-8501, Japan); Sato N ( Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Tokyo 102-0076, Japan); |
| Abstract | The thylakoid membranes of oxygenic photosynthetic organisms are dominated by the galactolipids monogalactosyldiacylglycerol (MGDG) and digalactosyldiacylglycerol (DGDG). In cyanobacteria, MGDG is synthesized via monoglucosyldiacylglycerol (GlcDG). However, the putative epimerase involved in the conversion of GlcDG to MGDG has not been identified. Here we report the identification of the gene for the glucolipid epimerase (mgdE) by comparative genomic analysis. Knockout mutants of mgdE in Synechocystis sp. PCC 6803 lacked both MGDG and DGDG and accumulated GlcDG. The mutants did possess thylakoid membranes and showed normal maximal photosynthetic activity, albeit with reduced utilization of light energy. These results cast doubt on the long-standing belief that oxygenic photosynthesis is absolutely dependent on galactolipids. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 37 |
| Volume Number | 111 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2014-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Galactolipids Metabolism Oxygen Photosynthesis Synechocystis Escherichia Coli Genetics Biosynthesis Chemistry Mutation Phylogeny Racemases And Epimerases Thylakoids Ultrastructure Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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