The glnALG operon is an operon that regulates the nitrogen content of a cell. It codes for the structural gene glnA the two regulatory genes glnL and glnG. glnA encodes glutamine synthetase, an enzyme which catalyzes the conversion of glutamate and ammonia to glutamine, thereby controlling the nitrogen level in the cell. glnG encodes NRI which regulates the expression of the glnALG operon at three promoters, which are glnAp1, glnAp2 located upstream of glnA) and glnLp (intercistronic glnA-glnL region). glnL encodes NRII which regulates the activity of NRI.No significant homology is found in Eukaryotes.
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