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Evidence for direct repression of nitrogenase by ammonia in the cyanobacterium Anabaena cylindrica |
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| Authors: | A H Mackerras G D Smith |
| Affiliation: | 1. Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada;2. School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom;3. Department of Physical and Environmental Sciences, University of Toronto at Scarborough, Toronto, Ontario M1C 1A4, Canada;4. State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Oil and Gas Pollution Control, China University of Petroleum, Beijing 102249, China;5. Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada |
| Abstract: | The nitrogenase activity of the cyanobacterium Anabaena cylindrica was repressed upon addition of ammonium salts after preincubation in the presence of a concentration of L-methionine-DL-sulfoximine sufficient to totally inhibit glutamine synthetase. Repression was also observed when urea was added to cells in the presence of the glutamine synthetase inhibitor. Measurements of ammonia concentrations were made in each case and provided evidence that ammonia itself is a primary regulator of nitrogenase levels in A. cylindrica. |
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