Premium
Regulation of ammonium/methylammonium transport by ammonium in the cyanobacterium Anabaena variabilis
Author(s) -
Rai A. N.,
Singh D. T.,
Singh H. N.
Publication year - 1986
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1986.tb01933.x
Subject(s) - derepression , ammonium , anabaena variabilis , psychological repression , biochemistry , chemistry , glutamine synthetase , glutamine , biology , cyanobacteria , organic chemistry , amino acid , bacteria , gene , gene expression , genetics
The ammonium transport system of Anabaena variabilis Kütz ATCC 29413 was studied with regard to its repression and derepression using [ 14 C]‐methylammonium as an analogue for ammonium. Whereas N 2 ‐grown cells showed an active ammonium transport system, the latter was repressed in ammonium‐grown cells. Repression of the ammonium transport system by ammonium did not require ammonium assimilation or de novo protein synthesis, suggesting that ammonium itself was the repressor signal. The derepression of the ammonium transport system however, required de novo protein synthesis and glutamine synthetase activity.