Anaerobic Degradation of Glycerol by Desulfovibrio fructosovorans and D. carbinolicus and Evidence for Glycerol-Dependent Utilization of 1,2-Propanediol |
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Authors: | Abdel I. Qatibi Rhizlane Bennisse Moha Jana Jean-Louis Garcia |
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Affiliation: | (1) Laboratoire de Microbiologie et Biotechnologie Appliquées à l'Environnement, Université Cadi-Ayyad, Faculté des sciences & Techniques–Guéliz, B.P. 618, 40000 Marrakech, Maroc , FA;(2) Laboratoire de Microbiologie, Université Cadi-Ayyad, Faculté des sciences–Semlalia, 40000 Marrakech, Maroc , FA;(3) Laboratoire ORSTOM de Microbiologie des Anaérobies, Université de Provence, CESB-ESIL case 925, 163 Avenue de Luminy, 13288 Marseille Cedex 9, France , FR |
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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. Received: 1 October 1997 / Accepted: 3 November 1997 |
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