title: DddD is a CoA-transferase/lyase producing dimethyl sulfide in the marine environment.
abstract: Dimethyl sulfide (DMS) is produced in oceans in vast amounts (>10(7) tons/year) and mediates a wide range of processes from regulating marine life forms to cloud formation. Nonetheless, none of the enzymes that produce DMS from dimethylsulfoniopropionate (DMSP) has been adequately characterized. We describe the expression and purification of DddD from the marine bacterium Marinomonas sp. MWYL1 and its biochemical characterization. We identified DMSP and acetyl-coenzyme A to be DddD's native substrates and Asp602 as the active site residue mediating the CoA-transferase prior to lyase activity. These findings shed light on the biochemical utilization of DMSP in the marine environment.
authors.affiliation: Department of Biological Chemistry and ‡Department of Plant Sciences, Weizmann Institute of Science , Rehovot 76100, Israel.
authors.forename: Uria
authors.initials: U
authors.lastname: Alcolombri
authors.forename: Paola
authors.initials: P
authors.lastname: Laurino
authors.forename: Pedro
authors.initials: P
authors.lastname: Lara-Astiaso
authors.forename: Assaf
authors.initials: A
authors.lastname: Vardi
authors.forename: Dan S
authors.initials: DS
authors.lastname: Tawfik
mesh_terms: D001426:Bacterial Proteins / Q000378:metabolism*; D053544:Marinomonas / Q000201:enzymology*; D012623:Seawater; D013440:Sulfides / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D013440:Sulfides; C004784:dimethyl sulfide