title: Response to a metal ion-citrate complex in bacterial sensing.
abstract: Salmonella typhimurium responds chemotactically to gradients of divalent cations in the presence of citrate ions. The actual chemoeffector is the citrate-metal ion complex, which acts as an attractant. Citrate (which is also a chemoeffector for Salmonella) and the citrate-metal ion complex are recognized by different receptors. The response of Salmonells,  which can transport citrate through its membrane, is quite different than that of Escherichia coli, which cannot.
mesh_terms: D001419:Bacteria / Q000187:drug effects*; D000252:Calcium-Transporting ATPases / Q000235:genetics; D002413:Cations, Divalent; D002633:Chemotaxis / Q000187:drug effects*; D002951:Citrates / Q000494:pharmacology*; D008670:Metals / Q000494:pharmacology*; D009154:Mutation; D012475:Salmonella / Q000187:drug effects / Q000235:genetics / Q000502:physiology
chemical_list: D002413:Cations, Divalent; D002951:Citrates; D008670:Metals; D000252:Calcium-Transporting ATPases