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. 1973 Sep;115(3):816–823. doi: 10.1128/jb.115.3.816-823.1973

Three Kinds of Controls Affecting the Expression of the glp Regulon in Escherichia coli

W B Freedberg 1, E C C Lin 1
PMCID: PMC246326  PMID: 4580569

Abstract

Three kinds of control mechanisms govern the expression of the members of the glp regulon for glycerol and sn-glycerol 3-phosphate (G3P) catabolism in Escherichia coli K-12: specific repression by the product of the glpR gene; catabolite repression; and respiratory repression (the effect exerted by exogenous hydrogen acceptors). The operons of the glp system show different patterns of response to each control. By growing in parallel a mutant strain with temperature-sensitive repressor (glpRts) and an isogenic control with a deletion in the regulator gene at progressively higher temperatures, it was possible to show that the synthesis of aerobic G3P dehydrogenase (glpD product) is far more sensitive to specific repression than that of either glycerol kinase (glpK product) or G3P transport (glpT product). Conversely, in the strain with a deletion in the regulator gene, the syntheses of glycerol kinase and G3P transport are more sensitive to catabolite repression than that of the aerobic G3P dehydrogenase. The levels of the two flavoprotein G3P dehydrogenases vary in opposite directions in response to changes of exogenous hydrogen acceptors. For example, the ratio of the aerobic enzyme to the anaerobic enzyme (specified by glpA) is high when molecular oxygen or nitrate serves as the hydrogen acceptor and low when fumarate plays this role. This trend is not influenced by the addition of cyclic adenosine 3′,5′-monophosphate to the growth medium. Thus, respiratory repression most likely involves a third mechanism of control, independent of specific or catabolite repression.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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