Apparently Unidirectional Polyamine Transport by Proton Motive Force in Polyamine-deficient Escherichia Coli

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1986 Mar 1

PMID 3005244

Citations 20

Authors

K Kashiwagi

H Kobayashi

K Igarashi

Affiliations

Soon will be listed here.

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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