Kup-mediated Cs+ uptake and Kdp-driven K+ uptake coordinate to promote cell growth during excess Cs+ conditions in Escherichia coli.

Abstract:

:The physiological effects of caesium (Cs) on living cells are poorly understood. Here, we examined the physiological role of Cs+ on the activity of the potassium transporters in E. coli. In the absence of potassium (K+), Kup-mediated Cs+ uptake partially supported cell growth, however, at a much lower rate than with sufficient K+. In K+-limited medium (0.1 mM), the presence of Cs+ (up to 25 mM) in the medium enhanced growth as much as control medium containing 1 mM K+. This effect depended on the maintenance of basal levels of intracellular K+ by other K+ uptake transporters. Higher amounts of K+ (1 mM) in the medium eliminated the positive effect of Cs+ on growth, and revealed the inhibitory effect of high Cs+ on the growth of wild-type E. coli. Cells lacking Kdp, TrkG and TrkH but expressing Kup grew less well when Cs+ was increased in the medium. A kdp mutant contained an increased ratio of Cs+/K+ in the presence of high Cs+ in the medium and consequently was strongly inhibited in growth. Taken together, under excess Cs+ conditions Kup-mediated Cs+ influx sustains cell growth, which is supported by intracellular K+ supplied by Kdp.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tanudjaja E,Hoshi N,Su YH,Hamamoto S,Uozumi N

doi

10.1038/s41598-017-02164-7

subject

Has Abstract

pub_date

2017-05-18 00:00:00

pages

2122

issue

1

issn

2045-2322

pii

10.1038/s41598-017-02164-7

journal_volume

7

pub_type

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