PMID: 377284Apr 1, 1979

Greatly decreased susceptibility of nonmetabolizing cells towards detergents

Proceedings of the National Academy of Sciences of the United States of America
E KomorWidmar Tanner


The addition of different detergents to Chlorella cells that had previously accumulated 6-deoxyglucose causes a rapid release of the hexose analogue into the medium. This effect is independent of the nature of the detergent and is observed only when the cells are in an energized state. Thus, in the presence of the uncoupler p-trifluoromethoxycarbonylcyanide phenylhydrazone or of inhibitors such as N-ethylmaleimide, the cells show a greatly reduced susceptibility towards detergents. Similarly, the detergent-induced loss of accumulated alpha-aminoisobutyric acid from Saccharomyces cerevisiae and of potassium from Escherichia coli is also strongly affected by the energy state of the cells. The differential susceptibility of energized and nonenergized cells was observed at all detergent concentrations tested. Measurements of substrate efflux at different concentrations of Triton indicated that only Triton monomers are responsible for the increase in permeability. The absorption of [14C]Triton X-100 by Chlorella and the binding of detergent to the cells were measured in the presence of metabolic inhibitors. Again, nonenergized cells bound a significantly lower amount of Triton X-100. The amphiphilic antibiotic nystatin produced effe...Continue Reading


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