Purification and Characterization of Sulfur Reductase from a Moderately Thermophilic Bacterial Strain, TI-1, that Oxidizes Iron
SUGIO, Tsuyoshi | ODA, Keiichi | Matsumoto, Keiko | TAKAI, Masaki | WAKASA, Satoshi | Kamimura, Kazuo
A moderately thermophilic bacterium, strain TI-1, produces H₂S outside of the cells when grown at 45°C on Fe²⁺-medium (pH 1.8) containing elemental sulfur and L-glutamic acid. A newly identified sulfur reductase was present in the cytosol of this strain and was purified to an electrophoretically homogeneous state from strain TI-1. The apparent molecular weight of sulfur reductase was 86,000 by gel filtration and 48,000 by SDS-PAGE, so the enzyme was a homodimer. The enzyme was most active at pH 9.0 and 60 to 70°C, and it catalyzed the reduction of 1 mol of elemental sulfur with 1 mol of NADH to give 1 mol of H₂S and 1 mol of NAD⁺. Elemental sulfur was a specific electron acceptor of this enzyme. Thiosulfate, sulfite, and tetrathionate were not electron acceptors, but inhibited sulfur reductase activity. NADPH was not used as an electron donor.
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