Thiosulfate oxidation by a moderately thermophilic hydrogen-oxidizing bacterium, Hydrogenophilus thermoluteolus |
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| Authors: | Daisuke Miyake Shin-ichi Ichiki Miyako Tanabe Takahiro Oda Hisao Kuroda Hirofumi Nishihara Yoshihiro Sambongi |
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| Affiliation: | (1) Graduate School of Biosphere Science, Hiroshima University, CREST of Japan Science and Technology Corporation, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan;(2) Faculty of Agriculture, Ibaraki University, 3-21-1 Chu-ou, Ami-machi, Inashiki-gun, Ibaraki 300-0393, Japan |
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| Abstract: | The moderately thermophilic Betaproteobacterium, Hydrogenophilus thermoluteolus, not only oxidizes hydrogen, the principal electron donor for growth, but also sulfur compounds including thiosulfate, a process enabled by sox genes. A periplasmic extract of H. thermoluteolus showed significant thiosulfate oxidation activity. Ten genes apparently involved in thiosulfate oxidation (soxEFCDYZAXBH) were found on a 9.7-kb DNA fragment of the H. thermoluteolus chromosome. The proteins SoxAX, which represent c-type cytochromes, were co-purified from the cells of H. thermoluteolus; they enhanced the thiosulfate oxidation activity of the periplasmic extract when added to the latter. |
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| Keywords: | Hydrogenophilus thermoluteolus Thiosulfate oxidation Sox genes |
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