Sodium dependence of acetate formation by the acetogenic bacterium Acetobacterium woodii.
AUTOR(ES)
Heise, R
RESUMO
Growth of Acetobacterium woodii on fructose was stimulated by Na+; this stimulation was paralleled by a shift of the acetate-fructose ratio from 2.1 to 2.7. Growth on H2-CO2 or on methanol plus CO2 was strictly dependent on the presence of sodium ions in the medium. Acetate formation from formaldehyde plus H2-CO by resting cells required Na+, but from methanol plus H2-CO did not. This is analogous to H2-CO2 reduction to methane by Methanosarcina barkeri, which involves a sodium pump (V. Müller, C. Winner, and G. Gottschalk, Eur. J. Biochem. 178:519-525, 1988). This suggests that the reduction of methylenetetrahydrofolate to methyltetrahydrofolate is the Na+-requiring reaction. A sodium gradient (Na+ out/Na+ in = 32, delta pNa = -91 mV) was built up when resting cells of A. woodii were incubated under H2-CO2. Acetogenesis was inhibited when the delta pNa was dissipated by monensin.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=210386Documentos Relacionados
- Nickel requirement of Acetobacterium woodii.
- Transformation of tetrachloromethane to dichloromethane and carbon dioxide by Acetobacterium woodii.
- Additional characteristics of one-carbon-compound utilization by Eubacterium limosum and Acetobacterium woodii.
- Carbonic anhydrase in Acetobacterium woodii and other acetogenic bacteria.
- Production and Utilization of Ethanol by the Homoacetogen Acetobacterium woodii