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PMID:19807777
| Citation |
Todd, JD, Curson, AR, Nikolaidou-Katsaraidou, N, Brearley, CA, Watmough, NJ, Chan, Y, Page, PC, Sun, L and Johnston, AW (2010) Molecular dissection of bacterial acrylate catabolism--unexpected links with dimethylsulfoniopropionate catabolism and dimethyl sulfide production. Environ. Microbiol. 12:327-43 |
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| Abstract |
A bacterium in the genus Halomonas that grew on dimethylsulfoniopropionate (DMSP) or acrylate as sole carbon sources and that liberated the climate-changing gas dimethyl sulfide in media containing DMSP was obtained from the phylloplane of the macroalga Ulva. We identified a cluster that contains genes specifically involved in DMSP catabolism (dddD, dddT) or in degrading acrylate (acuN, acuK) or that are required to break down both substrates (dddC, dddA). Using NMR and HPLC analyses to trace 13C- or 14C-labelled acrylate and DMSP in strains of Escherichia coli with various combinations of cloned ddd and/or acu genes, we deduced that DMSP is imported by the BCCT-type transporter DddT, then converted by DddD to 3-OH-propionate (3HP), liberating dimethyl sulfide in the process. As DddD is a predicted acyl CoA transferase, there may be an earlier, unidentified catabolite of DMSP. Acrylate is also converted to 3HP, via a CoA transferase (AcuN) and a hydratase (AcuK). The 3HP is predicted to be catabolized by an alcohol dehydrogenase, DddA, to malonate semialdehyde, thence by an aldehyde dehydrogenase, DddC, to acyl CoA plus CO2. The regulation of the ddd and acu genes is unusual, as a catabolite, 3HP, was a co-inducer of their transcription. This first description of genes involved in acrylate catabolism in any organism shows that the relationship between the catabolic pathways of acrylate and DMSP differs from that which had been suggested in other bacteria. |
| Links |
PubMed Online version:10.1111/j.1462-2920.2009.02071.x |
| Keywords |
Acrylates/metabolism; Coenzyme A-Transferases/genetics; Coenzyme A-Transferases/metabolism; Genes, Bacterial; Halomonas/genetics; Halomonas/metabolism; Sulfides/metabolism; Sulfonium Compounds/metabolism |
| edit table |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:0008410: CoA-transferase activity |
ECO:0000315: |
F |
Fig 3 shows that E. coli transformed with acu genes shows much higher levels of 3-HP |
complete | ||||
| GO:0004300: enoyl-CoA hydratase activity |
ECO:0000315: |
F |
Fig 3 shows that E. coli transformed with acu genes shows much higher 3-HP production. This supports this enzymes involvement in converting acrylate to 3-HP |
complete | ||||
| GO:1902087: dimethylsulfoniopropionate catabolic process |
ECO:0000314: direct assay evidence used in manual assertion |
P |
Figure 4B shows DMSP catabolic activity of dddD. E. coli containing plasmid pBIO 1733 which has dddD genes can catabolize DMSP to produce 3HP detected by HPLC as chromatogram peak. (direct assay). |
complete | ||||
See also
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