title: Metabolite gene regulation: imidazole and imidazole derivatives which circumvent cyclic adenosine 3',5'-monophosphate in induction of the Escherichia coli L-arabinose operon.
abstract: Imidazole, histidine, histamine, histidinol phosphate, urocanic acid, or imidazolepropionic acid were shown to induce the L-arabinose operon in the absence of cyclic adenosine 3',5'-monophosphate. Induction was quantitated by measuring the increased differential rate of synthesis of L-arabinose isomerase in Escherichia coli strains which carried a deletion of the adenyl cyclase gene. The crp gene product (cyclic adenosine 3',5'-monophosphate receptor protein) and the araC gene product (P2) were essential for induction of the L-arabinose operon by imidazole and its derivatives. These compounds were unable to circumvent the cyclic adenosine 3',5'-monophosphate in the induction of the lactose or the maltose operons. The L-arabinose regulon was catabolite repressed upon the addition of glucose to a strain carrying an adenyl cyclase deletion growing in the presence of L-arabinose with imidazole. These results demonstrated that several imidazole derivatives may be involved in metabolite gene regulation (23).
mesh_terms: D019747:Aldose-Ketose Isomerases; D001089:Arabinose / Q000378:metabolism*; D002238:Carbohydrate Epimerases / Q000378:metabolism; D000242:Cyclic AMP / Q000378:metabolism*; D004794:Enzyme Repression; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D007093:Imidazoles / Q000378:metabolism*; D009876:Operon; D013237:Stereoisomerism
chemical_list: D007093:Imidazoles; D001089:Arabinose; D000242:Cyclic AMP; D002238:Carbohydrate Epimerases; D019747:Aldose-Ketose Isomerases; C019715:L-arabinose isomerase; D005947:Glucose