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. 1981 Sep;147(3):1054–1062. doi: 10.1128/jb.147.3.1054-1062.1981

Effects of lipophilic cations on motility and other physiological properties of Bacillus subtilis.

A Zaritsky, R M Macnab
PMCID: PMC216146  PMID: 6792185

Abstract

Lipophilic cations (tetraphenylarsonium, tetraphenylphosphonium, and triphenylmethylphosphonium) caused a number of major changes in the physiology of Bacillus subtilis. Macromolecular synthesis was inhibited, adenosine 5'-triphosphate concentration increased, swimming speed was reduced, tumbling was suppressed, and the capacity to take up the cations was greatly enhanced; respiration was not significantly altered. The effects occurred at lipophilic cation concentrations in the range commonly employed for measurement of membrane potential. Neither the enhancement of cation uptake nor the motility inhibition was a consequence of alteration of membrane potential, since both effects were still seen in the presence of valinomycin, with the extent of 86Rb+ uptake indicating a constant potential. Because suppression of tumbling accompanied speed reduction, as has also been found when protonmotive force is reduced, it is likely that lipophilic cations are perturbing the process of conversion of proton energy into work, rather than simply causing structural damage.

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Selected References

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