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• W2103537475 abstract "ABSTRACT Transcriptional and enzymatic analyses of Pyrococcus furiosus previously indicated that three proteins play key roles in the metabolism of elemental sulfur (S 0 ): a membrane-bound oxidoreductase complex (MBX), a cytoplasmic coenzyme A-dependent NADPH sulfur oxidoreductase (NSR), and sulfur-induced protein A (SipA). Deletion strains, referred to as MBX1, NSR1, and SIP1, respectively, have now been constructed by homologous recombination utilizing the uracil auxotrophic COM1 parent strain (Δ pyrF ). The growth of all three mutants on maltose was comparable without S 0 , but in its presence, the growth of MBX1 was greatly impaired while the growth of NSR1 and SIP1 was largely unaffected. In the presence of S 0 , MBX1 produced little, if any, sulfide but much more acetate (per unit of protein) than the parent strain, demonstrating that MBX plays a critical role in S 0 reduction and energy conservation. In contrast, comparable amounts of sulfide and acetate were produced by NSR1 and the parent strain, indicating that NSR is not essential for energy conservation during S 0 reduction. Differences in transcriptional responses to S 0 in NSR1 suggest that two sulfide dehydrogenase isoenzymes provide a compensatory NADPH-dependent S 0 reduction system. Genes controlled by the S 0 -responsive regulator SurR were not as highly regulated in MBX1 and NSR1. SIP1 produced the same amount of acetate but more sulfide than the parent strain. That SipA is not essential for growth on S 0 indicates that it is not required for detoxification of metal sulfides, as previously suggested. A model is proposed for S 0 reduction by P. furiosus with roles for MBX and NSR in bioenergetics and for SipA in iron-sulfur metabolism." @default.
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• W2103537475 date "2011-12-01" @default.
• W2103537475 modified "2023-10-17" @default.
• W2103537475 title "Deletion Strains Reveal Metabolic Roles for Key Elemental Sulfur-Responsive Proteins in Pyrococcus furiosus" @default.
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• W2103537475 doi "https://doi.org/10.1128/jb.05445-11" @default.
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