Synthesis of glucosylglycerol in salt-stressed cells of the cyanobacterium Microcystis firma |
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Authors: | M. Hagemann N. Erdmann E. Wittenburg |
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Affiliation: | (1) Sektion Biologie, Wilhelm-Pieck-Universität, Doberaner Strasse 143, DDR-2500 Rostock, German Democratic Republic |
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Abstract: | The unicellular cyanobacterium Microcystis furma tolerates salinity by accumulating the osmoprotective compound glucosylglycerol. After salt shock, the initial rate of glucosylglycerol synthesis is independent of the NaCl concentration used. In pulse chase experiments with NaH14CO3, synthesis of glucosylglycerol by salt-adapted cells was found to be rapid, whereas no sign of its breakdown was detected. Therefore, it is concluded that no turnover of glucosylglycerol takes place in salt-adapted cells. The specific capacity of the glucosylglycerol-forming enzyme system may be one reason for the salt resistance limit.Abbreviation GG glucosylglycerolDedicated to Prof. Dr. Eike Libbert on the occasion of his 60th birthday |
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Keywords: | Cyanobacteria Microcystis Glucosylglycerol Salt adaptation Synthesis rate Turnover |
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