Editor: Wilfrid Mitchell
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Dimethylsulfide is an energy source for the heterotrophic marine bacterium Sagittula stellata
Article first published online: 19 JUL 2011
DOI: 10.1111/j.1574-6968.2011.02349.x
© 2011 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved
Additional Information
How to Cite
Boden, R., Murrell, J. C. and Schäfer, H. (2011), Dimethylsulfide is an energy source for the heterotrophic marine bacterium Sagittula stellata. FEMS Microbiology Letters, 322: 188–193. doi: 10.1111/j.1574-6968.2011.02349.x
Publication History
- Issue published online: 11 AUG 2011
- Article first published online: 19 JUL 2011
- Accepted manuscript online: 30 JUN 2011 03:59PM EST
- Received 30 March 2011; revised 15 June 2011; accepted 23 June 2011, Final version published online 19 July 2011.
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Keywords:
- chemoorganoheterotrophy;
- mixotrophy;
- energy metabolism;
- marine microbiology;
- bioenergetics;
- chemostat kinetics
Abstract
Dimethylsulfide (DMS) is a volatile organosulfur compound, ubiquitous in the oceans, that has been credited with various roles in biogeochemical cycling and in climate control. Various oceanic sinks of DMS are known – both chemical and biological – although they are poorly understood. In addition to the utilization of DMS as a carbon or a sulfur source, some Bacteria are known to oxidize it to dimethylsulfoxide (DMSO). Sagittula stellata is a heterotrophic member of the Alphaproteobacteria found in marine environments. It has been shown to oxidize DMS during heterotrophic growth on sugars, but the reasons for and the mechanisms of this oxidation have not been investigated. Here, we show that the oxidation of DMS to DMSO is coupled to ATP synthesis in S. stellata and that DMS acts as an energy source during chemoorganoheterotrophic growth of the organism on fructose and on succinate. DMS dehydrogenase (which is responsible for the oxidation of DMS to DMSO in other marine Bacteria) and DMSO reductase activities were absent from cells grown in the presence of DMS, indicating an alternative route of DMS oxidation in this organism.