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- W4248916622 abstract "Nitrogen regulation of urea uptake and urease (EC 3.5.1.5) was studied in the cyanobacterium Anabaena cycadeae and its glutamine auxotroph. Development of the urea uptake and urease systems started simultaneously and the systems were found to be independent. The levels of both the systems were higher in the glutamine auxotroph lacking glutamine synthetase (EC 6.3.1.2) than in the wild-type strain having normal glutamine synthetase activity. The urea-uptake system was found to be NH4+-repressible and NH4+ was the initial repressor signal. NH4+ did not inhibit the urease activity in the glutamine auxotroph whereas glutamine did so, suggesting that repression of urease by NH4+ requires the operation of glutamine synthetase and probably involves the participation of some organic nitrogen metabolites like glutamine." @default.
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- W4248916622 date "1991-11-15" @default.
- W4248916622 modified "2023-10-18" @default.
- W4248916622 title "Urea metabolism in the cyanobacterium Anabaena cycadeae: regulation of urea uptake and urease by ammonia" @default.
- W4248916622 doi "https://doi.org/10.1016/0378-1097(91)90124-s" @default.
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