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- W4320855832 abstract "Abstract Chlorobaculum tepidum is an anaerobic green sulfur bacterium which oxidizes sulfide, elemental sulfur, and thiosulfate for photosynthetic growth. It can also oxidize sulfide to produce extracellular S 0 globules, which can be further oxidized to sulfate and used as an electron donor. Here, we performed label‐free quantitative proteomics on total cell lysates prepared from different metabolic states, including a sulfur production state (10 h post‐incubation [PI]), the beginning of sulfur consumption (20 h PI), and the end of sulfur consumption (40 h PI), respectively. We observed an increased abundance of the sulfide:quinone oxidoreductase (Sqr) proteins in 10 h PI indicating a sulfur production state. The periplasmic thiosulfate‐oxidizing Sox enzymes and the dissimilatory sulfite reductase (Dsr) subunits showed an increased abundance in 20 h PI, corresponding to the sulfur‐consuming state. In addition, we found that the abundance of the heterodisulfide‐reductase and the sulfhydrogenase operons was influenced by electron donor availability and may be associated with sulfur metabolism. Further, we isolated and analyzed the extracellular sulfur globules in the different metabolic states to study their morphology and the sulfur cluster composition, yielding 58 previously uncharacterized proteins in purified globules. Our results show that C . tepidum regulates the cellular levels of enzymes involved in sulfur metabolism in response to the availability of reduced sulfur compounds." @default.
- W4320855832 created "2023-02-16" @default.
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- W4320855832 date "2023-03-10" @default.
- W4320855832 modified "2023-10-02" @default.
- W4320855832 title "Insights into the sulfur metabolism of <i>Chlorobaculum tepidum</i> by label‐free quantitative proteomics" @default.
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- W4320855832 doi "https://doi.org/10.1002/pmic.202200138" @default.
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