Non-growth-associated demethylation of dimethylsulfoniopropionate by (homo)acetogenic bacteria

Article Abstract:

The demethylation of dimethylsulfoniopropionate (DMSP) to methylthiopropionate (MTPA) by the marine sulfate-reducing bacteria (homo)acetogenic bacteria is modeled. A glycine betaine-demethylating enzyme catalyzes the demethylation process, and the higher energy demand may decrease the overall fermentation adenosine triphosphate yield to nearly zero, accounting for little or no growth in biomass.

Netherlands, Statistical Data Included, Models, Physiological aspects, Biomass, Marine microbiology

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Methanogenic conversion of 3-S-methylmercaptopropionate to 3-mercaptopropionate

Article Abstract:

Examination of the abilities of various methanogenic strains to use 3-S-methylmercaptopropionate (MMPA) as a growth substrate reveals that three methanogenic archaea exhibit ability to convert MMPA to 3-mercaptopropionate. Degradation of one mol of MMPA generates 0.75 mol of methane. Addition of antibiotics facilitates the conversion of 380 microM MMPA into 275 microM methane. Addition of 2-bromoethanesulfonate helps convert MMPA to methanethiol.

Analysis, Methanobacteriaceae, Methanogens

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Demethylation of dimethylsulfoniopropionate to 3-S-methylmercaptopropionate by marine sulfate-reducing bacteria

Article Abstract:

The WN strain of an intertidal marine sulfate-reducing bacteria is able to demethylate dimethylsulfoniopropionate (DMSP) to form 3-S-methylmercaptopropionate. The bacteria is an anaerobic gram-negative non-motile rod bacteria that is closely related to Desulfobacter latus, D. hydrogenophilus and Desulfobacula toluolica. It uses the acetyl co-enzyme A-CO dehydrogenase pathway to oxidize DMSP. In the demethylation of DMSP and betaine, anaerobes yield MMPA and dimethylglycine which are not the end products in case of aerobic bacteria.

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