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. 1986 Mar;165(3):972–977. doi: 10.1128/jb.165.3.972-977.1986

Apparently unidirectional polyamine transport by proton motive force in polyamine-deficient Escherichia coli.

K Kashiwagi, H Kobayashi, K Igarashi
PMCID: PMC214524  PMID: 3005244

Abstract

A transport system for polyamines was studied with both intact cells and membrane vesicles of an Escherichia coli polyamine-deficient mutant. Polyamine uptake by intact cells and membrane vesicles was inhibited by various protonophores, and polyamines accumulated in membrane vesicles when D-lactate was added as an energy source or when a membrane potential was imposed artificially by the addition of valinomycin to K+-loaded vesicles. These results show that the uptake was dependent on proton motive force. Transported [14C]putrescine and [14C]spermidine were not excreted by intact cells upon the addition either of carbonyl cyanide m-chlorophenylhydrazone, A23187, and Ca2+ or of an excess amount of nonlabeled polyamine. However, they were excreted by membrane vesicles, although the degree of spermidine efflux was much lower than that of putrescine efflux. These results suggest that the apparent unidirectionality in intact cells has arisen from polyamine binding to nucleic acids, thus giving rise to a negligible free intracellular concentration of polyamines. Polyamine uptake, especially putrescine uptake, was inhibited strongly by monovalent cations. The Mg2+ ion inhibited spermidine and spermine uptake but not putrescine uptake.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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