title: Interaction of product analogues with the active site of rhodobacter sphaeroides dimethyl sulfoxide reductase.
abstract: We report a structural characterization using X-ray absorption spectroscopy of Rhodobacter sphaeroides dimethyl sulfoxide (DMSO) reductase reduced with trimethylarsine and show that this is structurally analogous to the physiologically relevant dimethyl sulfide reduced DMSO reductase. Our data unambiguously indicate that these species should be regarded as formal MoIV species and indicate a classical coordination complex of trimethylarsine oxide, with no special structural distortions. The similarity of the trimethylarsine and dimethyl sulfide complexes suggests, in turn, that the dimethyl sulfide reduced enzyme possesses a classical coordination of DMSO with no special elongation of the S-O bond, as previously suggested.
authors.affiliation: Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada. g.george@usask.ca
authors.forename: Graham N
authors.initials: GN
authors.lastname: George
authors.forename: Kimberly Johnson
authors.initials: KJ
authors.lastname: Nelson
authors.forename: Hugh H
authors.initials: HH
authors.lastname: Harris
authors.forename: Christian J
authors.initials: CJ
authors.lastname: Doonan
authors.forename: K V
authors.initials: KV
authors.lastname: Rajagopalan
mesh_terms: D001152:Arsenicals / Q000737:chemistry*; D001665:Binding Sites; D007506:Iron-Sulfur Proteins / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D010088:Oxidoreductases / Q000737:chemistry*; D012242:Rhodobacter sphaeroides / Q000201:enzymology*; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000379:methods; D013329:Structure-Activity Relationship; D014965:X-Rays
chemical_list: D001152:Arsenicals; D007506:Iron-Sulfur Proteins; D010088:Oxidoreductases; C045664:dimethyl sulfoxide reductase; C009572:trimethylarsine