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Schematic illustration of putative pathways of sulfur metabolism in Hydrogenovibrio thermophilus strain S5. All oxidative enzyme systems shown in the periplasm (SOX, SQR, and FCC) and extracellular sulfur globules contribute to a putative pool of oligosulfides (HSn and possibly organic R-Sn-H). Putative sulfur transfer reactions and assimilatory sulfate reduction are proposed to occur in cytoplasm.
