Vitamin B12-dependent propionate production by the ruminal bacterium Prevotella ruminicola 23.
AUTOR(ES)
Strobel, H J
RESUMO
When Prevotella ruminicola 23 was grown in a defined medium containing a vitamin mixture, significant amounts of propionate were formed. Succinate and acetate were the major fermentation acids produced when vitamins were omitted, and further experiments demonstrated that propionate formation was dependent on vitamin B12. When the organism was grown in continuous culture at dilution rates of less than 0.20 h-1, propionate and acetate were the predominant fermentation products and little succinate was formed when vitamin B12 was present. However, at higher dilution rates, propionate formation declined and succinate accumulated. Since cell protein yields were reduced 15 to 25% in the absence of vitamin B12, the pathway for propionate formation may contain an energy-conserving step.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=195777Documentos Relacionados
- Role of phosphorolytic cleavage in cellobiose and cellodextrin metabolism by the ruminal bacterium Prevotella ruminicola.
- Vitamin B12 Production by a Methanol-Utilizing Bacterium
- Functions required for vitamin B12-dependent ethanolamine utilization in Salmonella typhimurium.
- Biochemical and mutational analysis of a gingipain-like peptidase activity from Prevotella ruminicola B(1)4 and its role in ammonia production by ruminal bacteria.
- Glycogen biosynthesis via UDP-glucose in the ruminal bacterium Prevotella bryantii B1(4).
