Abstract
The mechanism of Fe2+ production by a moderately thermophilic iron-oxidizing bacterium, strain TI-1, was studied. Strain TI-1 produced H2S outside of the cells when the following five l-amino acids, aspartic acid, glutamic acid, serine, arginine, and histidine, were added to the medium. The activity of H2S production was completely inhibited by uncouplers and inhibitors of cytochrome c oxidase or sulfite reductase. When Fe3 + was added to the H2S production medium, it was chemically reduced by the H2S produced by the strain to give Fe2+, the sole energy source of this bacterium.
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