title: Escherichia coli mutants with altered cation recognition by the melibiose carrier.
abstract: Revertants that showed normal cation recognition for melibiose transport were isolated from mutants with altered cation recognition (W3133-2S and W3133-2T) of Escherichia coli. Although the original two mutants possessed a second alteration, an increased activity of the Na+(Li+)/H+ antiporter, the revertants, which possessed the normal melibiose carrier, still showed altered properties of the Na+(Li+)/H+ antiporter. These results support the view that the alterations in the melibiose carrier and in the Na+(Li+)/H+ antiporter, observed in the mutants, are not genetically linked.
mesh_terms: D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D005816:Genetic Complementation Test; D007700:Kinetics; D026901:Membrane Transport Proteins / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D011995:Recombination, Genetic; D013379:Substrate Specificity; D027981:Symporters
chemical_list: D026901:Membrane Transport Proteins; D027981:Symporters; C021548:melibiose permease