title: Cloning and expression of the succinyl-CoA synthetase genes of Escherichia coli K12.
abstract: The genes encoding both subunits of the succinyl-CoA synthetase of Escherichia coli have been identified as distal genes of the suc operon, which also encodes the dehydrogenase (Elo; sucA) and succinyltransferase (E2o; sucB) components of the 2-oxoglutarate dehydrogenase complex. The newly defined genes express polypeptides of 41 kDa (sucC) and 31 kDa (sucD), corresponding to the beta and alpha subunits of succinyl-CoA synthetase, respectively. The genes are thus located at 16.8 min in the E. coli linkage map, together with the citrate synthase (gltA) and succinate dehydrogenase (sdh) genes, in a cluster of nine citric acid cycle genes: gltA-sdhCDAB-sucABCD. Four deletion strains lacking all of these citric acid cycle enzymes were characterized. The succinyl-CoA synthetase activities of strains harbouring plasmids containing the sucC and sucD genes were amplified some fourfold. Further enzymological studies indicated that expression of succinyl-CoA synthetase is coordinately regulated with 2-oxoglutarate dehydrogenase.
mesh_terms: D003001:Cloning, Molecular; D003066:Coenzyme A Ligases / Q000235:genetics*; D003470:Culture Media; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D005947:Glucose / Q000378:metabolism; D010957:Plasmids; D013389:Succinate-CoA Ligases / Q000235:genetics* / Q000378:metabolism
chemical_list: D003470:Culture Media; D003066:Coenzyme A Ligases; D013389:Succinate-CoA Ligases; D005947:Glucose