Open AccessRegulation of urea uptake by ammonia in the cyanobacterium Anabaena doliolum
Author(s) -
Singh Surendra,
Ahmad Sarfraz
Publication year - 1989
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1989.tb03578.x
Subject(s) - derepression , urea , psychological repression , biochemistry , ammonium , ammonia , glutamine synthetase , enzyme repression , repressor , glutamine , chemistry , anabaena , biology , cyanobacteria , transcription factor , amino acid , bacteria , gene , organic chemistry , gene expression , genetics
The urea uptake system was studied with regard to its repression and derepression in the cyanobacterium, Anabaena doliolum . The uptake of urea was energy‐dependent and was repressed in ammonia grown cells. Repression of the urea uptake by ammonium did not require ammonium assimilation or de novo protein synthesis, suggesting that ammonium itself was the repressor signal. The derepression of the urea uptake system, however, required de novo protein synthesis and glutamine synthetase activity.