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- W1569138873 abstract "A previously isolated mutant of Salmonella typhimurium lacking hydrogen sulfide production from both thiosulfate and sulfite was shown to have a single mutation which also caused the loss of fermentative gas production and the ability to grow on nonfermentable substrates and which mapped in the vicinity of the atp chromosomal locus. The implication that F0F1 ATP synthase might be essential for H2S and fermentative gas production was explored. The phs plasmid conferring H2S production on wild-type Escherichia coli failed to confer this ability on seven of eight E. coli atp point mutants representing, collectively, the eight genes encoding the subunits of F0F1 ATP synthase. However, it did confer some thiosulfate reductase activity on all except the mutant with a lesion in the ATP synthase catalytic subunit. Localized mutagenesis of the Salmonella atp chromosomal region yielded 500 point mutants unable to reduce thiosulfate to H2S or to produce gas from glucose, but differing in the extents of their ability to grow on succinate, to perform proton translocation as measured in a fluorescence quenching assay, and to reduce sulfite to H2S. Biochemical assays showed that all mutants were completely devoid of both methyl viologen and formate-linked thiosulfate reductase and that N,N'-dicyclohexylcarbodiimide blocked thiosulfate reductase activity by the wild type, suggesting that thiosulfate reductase activity has an absolute requirement for F0F1 ATP synthase. Hydrogenase-linked formate dehydrogenase was also affected, but not as severely as thiosulfate reductase. These results imply that in addition to linking oxidation with phosphorylation, F0F1 ATP synthase plays a key role in the proton movement accompanying certain anaerobic reductions and oxidations." @default.
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- W1569138873 date "1997-11-01" @default.
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- W1569138873 title "Hydrogen sulfide production and fermentative gas production by Salmonella typhimurium require F0F1 ATP synthase activity" @default.
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- W1569138873 doi "https://doi.org/10.1128/jb.179.21.6736-6740.1997" @default.
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