Ion Exchange in Escherichia coli: Potassium-Binding Proteins

Science  04 Jul 1969:
Vol. 165, Issue 3888, pp. 79-81
DOI: 10.1126/science.165.3888.79


The potassium binding that occurs during passive accumulation by intact Escherichia coli has been demonstrated in a cell-free system. The data suggest that this binding is due largely to binding by the cell proteins in general and cannot be accounted for by the binding of a particular protein. The results are in accord with the view that the ion-exchange properties of protoplasmic poly-electrolyte determine the overall ionic composition of the cell.