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Schematic model for the regulation of the GS activities and NtrC protein in response to nitrogen status. UTase (glnD product) catalyses the uridylylation of PII (glnB product). UR activity of UTase catalyses PII deuridylylation. Adenyltransferase (Atase: glnE product) catalyses the adenylylation and deadenylylation of GS. NtrB protein kinase catalyses the phosphorylation and dephosphorylation of NtrC, a DNA‐binding response regulator.
