May cleave dimethylsulfonioproprionate (DMSP), releasing dimethyl sulfide (DMS). DMS is the principal form by which sulfur is transported from oceans to the atmosphere (PubMed:21249136). The real activity of the protein is however subject to debate and it is unclear whether it constitutes a real dimethylsulfonioproprionate lyase in vivo (Probable). S,S-dimethyl-beta-propiothetin = acrylate + dimethyl sulfide + H(+) Homodimer. Weakly induced by acrylate and dimethylsulfonioproprionate (DMSP). Part of the acuR-acuI-dddL operon. DMSP is used as an intracellular osmolyte, predator deterrent and antioxidant. Belongs to the non-heme iron-dependent dioxygenase family.