title: Phenotypic characterisation and genetic complementation of dimethylsulfoxide respiratory mutants of Rhodobacter sphaeroides and Rhodobacter capsulatus.
abstract: Two chlorate resistant mutants of Rhodobacter sphaeroides were isolated which were deficient in dimethylsulfoxide reductase activity. Immunoblotting experiments showed that the phenotype of these mutants and that of Rhodobacter capsulatus strain DK9, a mutant unable to reduce dimethylsulfoxide, was correlated with low or undetectable levels of the dimethylsulfoxide reductase apoprotein. All three mutants were complemented by a cosmid from a library of Rhodobacter sphaeroides genomic DNA. Further genetic complementation analysis revealed that functions required for restoration of dimethylsulfoxide reductase activity in the Rhodobacter sphaeroides mutants were encoded on an 9 kb EcoR1 DNA fragment derived from this cosmid. Expression of this 9 kb DNA fragment in Escherichia coli showed that it encoded the dimethylsulfoxide reductase structural gene of Rhodobacter sphaeroides.
authors.affiliation: Centre for Metalloprotein Spectroscopy and Biology, School of Biological Sciences, University of East Anglia, Norwich, UK.
authors.forename: T C
authors.initials: TC
authors.lastname: Bonnett
authors.forename: P
authors.initials: P
authors.lastname: Cobine
authors.forename: R E
authors.initials: RE
authors.lastname: Sockett
authors.forename: A G
authors.initials: AG
authors.lastname: McEwan
mesh_terms: D004121:Dimethyl Sulfoxide / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics; D015870:Gene Expression / Q000235:genetics; D005816:Genetic Complementation Test; D007506:Iron-Sulfur Proteins; D009154:Mutation / Q000235:genetics; D010088:Oxidoreductases / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D016354:Rhodobacter capsulatus / Q000201:enzymology / Q000235:genetics* / Q000302:isolation & purification; D012242:Rhodobacter sphaeroides / Q000201:enzymology / Q000235:genetics* / Q000302:isolation & purification
chemical_list: D007506:Iron-Sulfur Proteins; D010088:Oxidoreductases; C045664:dimethyl sulfoxide reductase; D004121:Dimethyl Sulfoxide