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Oxidation of dimethylsulfide to tetrathionate by Methylophaga thiooxidans sp. nov.: a new link in the sulfur cycle
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Boden, Rich, Kelly, Donovan P. , Murrell, J. C. (J. Colin) and Schäfer, Hendrik. (2010) Oxidation of dimethylsulfide to tetrathionate by Methylophaga thiooxidans sp. nov.: a new link in the sulfur cycle. Environmental Microbiology, Vol.12 (No.10). pp. 2688-2699. ISSN 1462-2912
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Official URL: http://dx.doi.org/10.1111/j.1462-2920.2010.02238.x
Abstract
A new pathway of dimethylsulfide (DMS) metabolism was identified in a novel species of Gammaproteobacteria, Methylophaga thiooxidans sp. nov., in which tetrathionate (S(4)O(6)2-) was the end-product of DMS oxidation. Inhibitor evidence indicated that DMS degradation was initiated by demethylation, catalysed by a corrinoid demethylase. Thiosulfate was an intermediate, which was oxidized to tetrathionate by a cytochrome-linked thiosulfate dehydrogenase. Thiosulfate oxidation was coupled to ATP synthesis, and M. thiooxidans could also use exogenous thiosulfate as an energy source during chemolithoheterotrophic growth on DMS or methanol. Cultures grown on a variety of substrates oxidized thiosulfate, indicating that thiosulfate oxidation was constitutive. The observations have relevance to interactions among sulfur-metabolizing bacteria in the marine environment. The production of tetrathionate from an organosulfur precursor is previously undocumented and represents a potential step in the biogeochemical sulfur cycle, providing a 'shunt' across the cycle.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QR Microbiology |
| Divisions: | Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010) Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010) |
| Journal or Publication Title: | Environmental Microbiology |
| Publisher: | Blackwell |
| ISSN: | 1462-2912 |
| Official Date: | October 2010 |
| Volume: | Vol.12 |
| Number: | No.10 |
| Number of Pages: | 12 |
| Page Range: | pp. 2688-2699 |
| Identification Number: | 10.1111/j.1462-2920.2010.02238.x |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | Natural Environment Research Council in the UK |
| Grant number: | NE/B501404/1, NE/E013333/1 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/5090 |
Data sourced from Thomson Reuters' Web of Knowledge
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