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. 1981 Aug;147(2):313–319. doi: 10.1128/jb.147.2.313-319.1981

Energy-dependent efflux of cadmium coded by a plasmid resistance determinant in Staphylococcus aureus.

Z Tynecka, Z Gos, J Zajac
PMCID: PMC216047  PMID: 7263609

Abstract

Resistance of Staphylococcus aureus strain 17810R to Cd2+ appears to be due to a plasmid-coded Cd2+ efflux system. Complete efflux of Cd2+ after transfer of preloaded cells into Cd2+-free medium occurred in the resistant strain 17810R, but not in the plasmidless derivative strain 17810S. Net efflux was blocked by 2,4-dinitrophenol, N,N,-dicyclohexylcarbodiimide (DCCD), and incubation at 4 degrees C. The inhibition of Cd2+ efflux by DCCD paralleled a stimulation of net uptake in the resistant cells by this agent. Cd2+ efflux by the resistant strain was accompanied by a reversal of inhibition of respiration, whereas in the sensitive strain, inhibition of respiration was not reversed after transfer to Cd2+-free medium. Net Cd2+ uptake by strain 17810R was inhibited by p-chloromercuribenzoate. In Cd2+ contrast, Cd2+ uptake by the plasmidless strain 17810S was affected neither by p-chloromercuribenzoate nor by DCCD when added alone, but was blocked by a combination of these two agents. Valinomycin had no effect on the reduced Cd2+ uptake by the resistant strain, whereas nigericin stimulated uptake to values comparable to those of the untreated sensitive cells. With sensitive cells, valinomycin reduced Cd2+ uptake by about 50%, whereas nigericin was without effect. A possible mechanism of Cd2+ movements in both strains is discussed.

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Selected References

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