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  • Title: Activation of the dephosphorylation of nitrogen regulator I-phosphate of Escherichia coli.
    Author: Liu J, Magasanik B.
    Journal: J Bacteriol; 1995 Feb; 177(4):926-31. PubMed ID: 7860602.
    Abstract:
    The transcription of sigma 54 RNA polymerase-dependent nitrogen-regulated genes is activated by nitrogen regulator I (NRI)-phosphate. The kinase NRII is responsible for the phosphorylation of NRI. It has been shown that NRII also has the ability to dephosphorylate NRI-phosphate but only when PII is present at a concentration greatly in excess of that of NRII. We have now shown that glutamate enables PII to stimulate the dephosphorylation of NRI-phosphate when present in equimolar concentration with NRII. This effect of glutamate appears to be a backup control that becomes effective when the normal regulation of PII activity is disabled.
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