Abstract
On transition from nitrogen starvation to ammonia or ammonia/glutamine sufficiency Phormidium uncinatum produces high amounts of H2O2, which is consumed by several oxidative reactions catalyzed by thylakoid membrane bound enzymes. These include: oxidation of glutamine to free hydroxylamine, of ammonia to nitrite, of bound hydroxylamine to nitrite, and dismutation of free hydroxylamine to ammonia and nitrite. A possible role of these transformations for detoxification is discussed.
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Abbreviations
- FCCP:
-
p-trifluormethoxy carbonylcyanide phenylhydrazone
- DCMU:
-
dichloromethyl urea
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Bagchi, S.N., Kleiner, D. Interrelationship between hydrogen peroxide, ammonia, glutamine, hydroxylamine and nitrite metabolism in the cyanobacterium Phormidium uncinatum . Arch. Microbiol. 156, 367–369 (1991). https://doi.org/10.1007/BF00248712
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DOI: https://doi.org/10.1007/BF00248712