Archives of Microbiology

, Volume 164, Issue 5, pp 363–369

Differential effects of sodium ions on motility in the homoacetogenic bacteriaAcetobacterium woodii andSporomusa sphaeroides

Original Paper

DOI: 10.1007/BF02529984

Cite this article as:
Müller, V. & Bowien, S. Arch. Microbiol. (1995) 164: 363. doi:10.1007/BF02529984


The strictly anaerobic homoacetogenic bacteriaAcetobacterium woodii andSporomusa sphaeroides differ with respect to their energy metabolism. Since growth as well as acetate and ATP formation ofA. woodii is strictly dependent on Na+, but that ofS. sphaeroides is not, the question arose whether these organisms also use different coupling ions for mechanical work, i.e. flagellar rotation. During growth on fructose in the presence of Na+ (50 mM), cells ofA. woodii were vigorously motile, as judged by light microscopy. At low Na+ concentrations (0.3 mM), the growth rate decreased by only 15%, but the cells were completely non-motile. Addition of Na+ to such cultures restored motility instantaneously. Motility, as determined in swarm agar tubes, was strictly dependent on Na+; Li+, but not K+ partly substituted for Na+. Of the amilorides tested, phenamil proved to be a specific inhibitor of the flagellar motor ofA. woodii. Growth and motility ofS. sphaeroides was neither dependent on Na+ nor inhibited by amiloride derivatives. These results indicate that flagellar rotation is driven by\(\Delta \tilde \mu _{Na^ + } \) inA. woodii, but by\(\Delta \tilde \mu _{H^ + } \) inS. sphaeroides.

Key words

Homoacetogenic bacteria Flagellar rotation Na+ H+ Acetobacterium woodii Sporomusa sphaeroides 




Benzamil N10

benzyl amiloride

\(\Delta \tilde \mu _{H^ + } \)

Electrochemical proton potential

\(\Delta \tilde \mu _{Na^ + } \)

Electrochemical sodium ion potential

ETH2120 N, N, N′, N′




Phenamil N10

phenyl amiloride

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  1. 1.Institut für Mikrobiologie der Georg-August-Universität GöttingenGöttingenGermany

Personalised recommendations