Shehawy RM, Kleiner D. Ammonium (methylammonium) transport by heterocysts and vegetative cells of Anabaena variabilis.
FEMS Microbiol Lett 1999;
181:303-6. [PMID:
10585553 DOI:
10.1111/j.1574-6968.1999.tb08859.x]
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Abstract
Transport of the ammonium analogue [(14)C]methylammonium was similar in non-growing, fully differentiated heterocysts as compared to vegetative, multiplying cells of the filamentous cyanobacterium Anabaena variabilis. NH(4)(+) inhibited uptake into the cells and released accumulated methylammonium from the cells. These observations suggest that the main function of ammonium transport in heterocysts may not be NH(4)(+) acquisition but cyclic retention of ammonia produced by nitrogenase.
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