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  • Title: Anaerobic degradation of glycerol by desulfovibrio fructosovorans and D. carbinolicus and evidence for glycerol-dependent utilization of 1,2-propanediol.
    Author: Qatibi AI, Bennisse R, Jana M, Garcia JL.
    Journal: Curr Microbiol; 1998 May; 36(5):283-90. PubMed ID: 9541565.
    Abstract:
    The degradation of glycerol by Desulfovibrio carbinolicus and Desulfovibrio fructosovorans was tested in pure culture with sulfate and in coculture with Methanospirillum hungatei. Desulfovibrio carbinolicus degraded glycerol into 3-hydroxypropionate with the formation of sulfide in pure culture and methane in the coculture. The maximum growth rates were 0.063 h-1 in pure culture and 0.014 h-1 in coculture (corresponding growth yields: 8.9 and 6.0 g dry weight/mol glycerol). With D. fructosovorans, the pathway of glycerol degradation depended upon the terminal electron acceptor. Acetate and sulfide were produced in the presence of sulfate, while 3-hydroxypropionate and methane were formed by the syntrophic association with M. hungatei. The maximum growth rates were 0.057 h-1 in pure culture and 0.020 h-1 in coculture (corresponding growth yields: 8.9 and 6.0 g dry weight/mol glycerol). In a medium containing both glycerol and 1,2-propanediol but no sulfate, D. carbinolicus and D. fructosovorans degraded both substrates. A drop in the concentration of 1,3-propanediol was observed, and propionate and n-propanol production was recorded. Putative biochemical pathways of 1,2-propanediol degradation by D. carbinolicus and D. fructosovorans indicated that the enzymes involved in this metabolism are present only when the strains are grown on a mixture of 1,2-propanediol and glycerol without sulfate.
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