title: Characterization of Escherichia coli adenylate cyclase mutants with modified regulation.
abstract: In Escherichia coli there is a large increase of cAMP synthesis in crp strains, which are deficient in the catabolite gene activator protein. In this work it was shown that this increase in cAMP synthesis does not occur in crp crr strains, deficient in both the catabolite gene activator protein and enzymeIII-glucose, a component of the phosphotransferase system. It was also shown that the other components of the phosphotransferase system are required to obtain the increase of cAMP synthesis in a crp background. Adenylate cyclase mutants were obtained, by random mutagenesis, which had partial adenylate cyclase activity but which did not exhibit increased levels of cAMP in a crp background. For three mutants the mutation was identified as a single point mutation. This allowed the identification of residues arginine 188, aspartic acid 414 and glycine 463 which could be involved in the catabolite gene activator protein dependent activation process.
authors.affiliation: Institut Pasteur, Unité de Régulation de l'Expression Génétique, Paris, France.
authors.forename: M
authors.initials: M
authors.lastname: Crasnier
authors.forename: A
authors.initials: A
authors.lastname: Danchin
mesh_terms: D000262:Adenylyl Cyclases / Q000096:biosynthesis / Q000235:genetics*; D000595:Amino Acid Sequence; D001483:Base Sequence; D000242:Cyclic AMP / Q000096:biosynthesis*; D002373:Cyclic AMP Receptor Protein / Q000235:genetics*; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D008969:Molecular Sequence Data; D009154:Mutation; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000378:metabolism; D010766:Phosphorylation; D010957:Plasmids; D015183:Restriction Mapping
chemical_list: D002373:Cyclic AMP Receptor Protein; D029968:Escherichia coli Proteins; C032242:crr protein, E coli; D000242:Cyclic AMP; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System; D000262:Adenylyl Cyclases