title: Association of ATP: glutamine synthetase adenylyltransferase activity with the P1 component of the glutamine synthetase deadenylylation system.
abstract: Regulation of glutamine synthetase (EC 6.3.1.2) in Escherichia coli is mediated by adenylylation and deadenylylation of the enzyme. The present studies show that one protein is a common component of both the adenylylation and deadenylylation systems. Thus, the ATP:glutamine synthetase adenylyltransferase, which catalyzes adenylylation of glutamine synthetase, and one of the two proteins required for deadenylylation (the P(I) protein) are inseparable by a variety of fractionation procedures. The adenylyltransferase and P(I)-deadenylylating activities behave as a single protein upon filtration through Agarose A 0.5 gel, and during chromatography on DE32 cellulose and hydroxyapatite columns. They migrate as a single protein band during electrophoresis on polyacrylamide gel and have identical susceptibilities to heat inactivation. These data indicate that the adenylyltransferase and the P(I)-deadenylylation activity are associated with the same protein complex.
mesh_terms: D000227:Adenine Nucleotides; D000251:Adenosine Triphosphatases / Q000302:isolation & purification; D001426:Bacterial Proteins / Q000302:isolation & purification; D002845:Chromatography; D002850:Chromatography, Gel; D004926:Escherichia coli / Q000201:enzymology; D005973:Glutamine; D008025:Ligases / Q000302:isolation & purification / Q000378:metabolism*; D011489:Protein Denaturation; D014166:Transferases / Q000378:metabolism
chemical_list: D000227:Adenine Nucleotides; D001426:Bacterial Proteins; D005973:Glutamine; D014166:Transferases; D000251:Adenosine Triphosphatases; D008025:Ligases