Cellulose degradation by one mesophilic strain Caulobacter sp. FMC1 under both aerobic and anaerobic conditions

► A mesophilic and cellulolytic bacterium Caulobacter sp. FMC1 was isolated. ► This strain could degrade cellulose both aerobically and anaerobically. ► Ethanol was the main fermentative product under anaerobic incubation on cellulose. ► The strain had advantages to utilize cellulose in redox-fluctu...

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Veröffentlicht in:Bioresource technology 2013-03, Vol.131, p.281-287
Hauptverfasser: Song, Na, Cai, Hai-Yuan, Yan, Zai-Sheng, Jiang, He-Long
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Cai, Hai-Yuan
Yan, Zai-Sheng
Jiang, He-Long
description ► A mesophilic and cellulolytic bacterium Caulobacter sp. FMC1 was isolated. ► This strain could degrade cellulose both aerobically and anaerobically. ► Ethanol was the main fermentative product under anaerobic incubation on cellulose. ► The strain had advantages to utilize cellulose in redox-fluctuating environments. ► The strain provided clue to optimize cellulose bioconversion process. Caulobacteria are presumed to be responsible for considerable mineralization of organic material in aquatic environments. In this study, a facultative, mesophilic and cellulolytic bacterium Caulobacter sp. FMC1 was isolated from sediments which were taken from a shallow freshwater lake and then enriched with amendment of submerged macrophyte for three months. This strain seemed to evolve a capacity to adapt redox-fluctuating environments, and could degrade cellulose both aerobically and anaerobically. Cellulose degradation percentages under aerobic and anaerobic conditions were approximately 27% and 10% after a 240-h incubation in liquid mediums containing 0.5% cellulose, respectively. Either cellulose or cellobiose alone was able to induce activities of endoglucanase, exoglucanase, and β-1,4-glucosidase. Interestingly, ethanol was produced as the main fermentative product under anaerobic incubation on cellulose. These results could improve our understanding about cellulose-degrading process in aquatic environments, and were also useful in optimizing cellulose bioconversion process for bioethanol production.
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subjects Biological and medical sciences
Bioreactors - microbiology
Biotechnology
Caulobacter
Caulobacter - classification
Caulobacter - isolation & purification
Caulobacter - metabolism
Cellulolytic
Cellulose - metabolism
Facultative
Fermentation
Fundamental and applied biological sciences. Psychology
Methods. Procedures. Technologies
Microbial engineering. Fermentation and microbial culture technology
Oxygen - metabolism
Sediments
Species Specificity
title Cellulose degradation by one mesophilic strain Caulobacter sp. FMC1 under both aerobic and anaerobic conditions
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