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. 1990 May;172(5):2728–2735. doi: 10.1128/jb.172.5.2728-2735.1990

Induction of the nag regulon of Escherichia coli by N-acetylglucosamine and glucosamine: role of the cyclic AMP-catabolite activator protein complex in expression of the regulon.

J A Plumbridge 1
PMCID: PMC208918  PMID: 2158978

Abstract

The divergent nag regulon located at 15.5 min on the Escherichia coli map encodes genes necessary for growth on N-acetylglucosamine and glucosamine. Full induction of the regulon requires both the presence of N-acetylglucosamine and a functional cyclic AMP (cAMP)-catabolite activator protein (CAP) complex. Glucosamine produces a lower level of induction of the regulon. A nearly symmetric consensus CAP-binding site is located in the intergenic region between nagE (encoding EIINag) and nagB (encoding glucosamine-6-phosphate deaminase). Expression of both nagE and nagB genes is stimulated by cAMP-CAP, but the effect is more pronounced for nagE. In fact, very little expression of nagE is observed in the absence of cAMP-CAP, whereas 50% maximum expression of nagB is observed with N-acetylglucosamine in the absence of cAMP-CAP. Two mRNA 5' ends separated by about 100 nucleotides were located before nagB, and both seem to be similarly subject to N-acetylglucosamine induction and cAMP-CAP stimulation. To induce the regulon, N-acetylglucosamine or glucosamine must enter the cell, but the particular transport mechanism used is not important.

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Selected References

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