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• W1944421915 abstract "Proton translocation coupled to dimethyl sulfoxide (DMSO) reduction was examined in Escherichia coli HB101 grown anaerobically on glycerol and DMSO. Rapid acidification of the medium was observed when an anaerobic suspension of cells, preincubated with glycerol, was pulsed with DMSO, methionine sulfoxide, nitrate, or trimethylamine N-oxide. The DMSO-induced acidification was sensitive to the uncoupler carbonyl cyanide p-trifluoromethoxyphenylhydrazone (60 microM) and was inhibited by the quinone analog 2-n-heptyl-4-hydroxy-quinoline-N-oxide (5.6 microM). Neither sodium azide nor potassium cyanide inhibited the DMSO response. An apparent----H+/2e- ratio of 2.9 was obtained for DMSO reduction with glycerol as the reductant. Formate and H2(g), but not lactate, could serve as alternate electron donors for DMSO reduction. Cells grown anaerobically on glycerol and fumarate displayed a similar response to pulses of DMSO, methionine sulfoxide, nitrate, and trimethylamine N-oxide with either glycerol or H2(g) as the electron donor. However, fumarate pulses did not result in acidification of the suspension medium. Proton translocation coupled to DMSO reduction was also demonstrated in membrane vesicles by fluorescence quenching. The addition of DMSO to hydrogen-saturated everted membrane vesicles resulted in a carbonyl cyanide p-trifluoromethoxyphenyl-hydrazone-sensitive fluorescence quenching of quinacrine dihydrochloride. The data indicate that reduction of DMSO by E. coli is catalyzed by an anaerobic electron transport chain, resulting in the formation of a proton motive force." @default.
• W1944421915 created "2016-06-24" @default.
• W1944421915 creator A5026785330 @default.
• W1944421915 creator A5048202373 @default.
• W1944421915 date "1985-07-01" @default.
• W1944421915 modified "2023-10-11" @default.
• W1944421915 title "Proton translocation coupled to dimethyl sulfoxide reduction in anaerobically grown Escherichia coli HB101" @default.
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• W1944421915 doi "https://doi.org/10.1128/jb.163.1.369-375.1985" @default.
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