Ammonium (methylammonium) transport by heterocysts and vegetative cells of Anabaena variabilis

Abstract Transport of the ammonium analogue [14C]methylammonium was similar in non-growing, fully differentiated heterocysts as compared to vegetative, multiplying cells of the filamentous cyanobacterium Anabaena variabilis. NH4+ inhibited uptake into the cells and released accumulated methylammoniu...

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Bibliographic Details
Published in:FEMS microbiology letters 1999-12, Vol.181 (2), p.303-306
Main Authors: Shehawy, Rehab M., Kleiner, Diethelm
Format: Article
Language:English
Subjects:
Ammonia
Ammonium
Ammonium Chloride - pharmacology
Ammonium transport
Anabaena
Anabaena - growth & development
Anabaena - metabolism
Anabaena - physiology
Anabaena variabilis
Bacteriology
Biological and medical sciences
Culture Media - chemistry
Cyanobacterium
Fundamental and applied biological sciences. Psychology
Heterocyst
Heterocysts
Methylamines - antagonists & inhibitors
Methylamines - metabolism
Microbiology
Nitrogenase
Permeability, membrane transport, intracellular transport
Time Factors
Transport
Vegetative cells
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Summary:Abstract Transport of the ammonium analogue [14C]methylammonium was similar in non-growing, fully differentiated heterocysts as compared to vegetative, multiplying cells of the filamentous cyanobacterium Anabaena variabilis. NH4+ 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 NH4+ acquisition but cyclic retention of ammonia produced by nitrogenase.
ISSN:0378-1097
1574-6968
DOI:10.1111/j.1574-6968.1999.tb08859.x