| Literature DB >> 1973929 |
A Mérida1, L Leurentop, P Candau, F J Florencio.
Abstract
Glutamine synthetases (GSs) from two cyanobacteria, one unicellular (Synechocystis sp. strain PCC 6803) and the other filamentous (Calothrix sp. strain PCC 7601 [Fremyella diplosiphon]), were purified to homogeneity. The biosynthetic activities of both enzymes were strongly inhibited by ADP, indicating that the energy charge of the cell might regulate the GS activity. Both cyanobacteria exhibited an ammonium-mediated repression of GS synthesis. In addition, the Synechocystis sp. showed an inactivation of GS promoted by ammonium that had not been demonstrated previously in cyanobacteria.Entities:
Mesh:
Substances:
Year: 1990 PMID: 1973929 PMCID: PMC213317 DOI: 10.1128/jb.172.8.4732-4735.1990
Source DB: PubMed Journal: J Bacteriol ISSN: 0021-9193 Impact factor: 3.490