PMID: 40954Oct 1, 1979

Characterization of the Bacillus subtilis motile system driven by an artificially created proton motive force

Journal of Bacteriology
S MatsuuraS Iida


Transient swimming was induced in energy-depleted cells of Bacillus subtilis by an artificial proton motive force, which was created by valinomycin addition and a pH reduction. This system did not require any ions except protons in the medium. The size of the induced motility was strongly influenced by changes in the size of either the K+ diffusion potential or the pH gradient. A rough estimation indicated that a proton motive force higher than -100 mV was required for induction of translational swimming of the cell. Corresponding with the transient appearance of swimming, a rapid but transient efflux of K+ and influx of H+ were observed. With decreases in the rate of H+ influx, the amount of motility decreased. A rate of H+ influx higher than 0.2 mumol/s per ml of cell water gave translational swimming. These results suggest direct coupling of H+ influx to rotation of bacterial flagella.


Feb 17, 1986·FEBS Letters·T Wagenknecht
Jun 3, 2000·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·H C Berg
Nov 10, 2009·Future Microbiology·Shun FujinamiMasahiro Ito
Dec 1, 1989·Journal of Bioenergetics and Biomembranes·Y Imae, T Atsumi
Jan 1, 1988·Cell Motility and the Cytoskeleton·S Khan

Related Concepts

Cell Motility
Bacillus subtilis
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