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The electron transport inhibitors antimycin A, cyanide, azide, hydroxylamine, and 2-n-heptyl-4-hydroxyquinoline-N-oxide (HQNO) inhibited H2 uptake and H2-dependent O2 uptake significantly. H2-reduced minus O2-oxidized absorption difference spectra revealed peaks at 551.5, 560, and 603 nm, indicating the involvement of cytochromes c, b, and a-a3, respectively. H2-dependent cytochrome reduction was completely inhibited in the presence of 0.15 mM HQNO. This inhibition was relieved by the addition of 0.1 mM menadione. Evidence is presented for the involvement of two b-type cytochromes in H2 oxidation. One b-type cytochrome was not reduced by ascorbate and had an absorption peak at 560 nm. The reduction of this cytochrome by H2 was not inhibited by cyanide. A second b-type cytochrome, cytochrome b', was not reduced by H2 in the presence of cyanide. This cytochrome had an absorption peak at 558 nm. Carbon monoxide difference spectra with H2 as reductant provided evidence for the involvement of cytochrome o as well as cytochrome a3 in H2 oxidation. H2 uptake activity in cell-free extracts was inhibited by UV light irradiation. Most of the activity of the UV-treated extracts was restored with the addition of ubiquinone. The restored activity was inhibited by cyanide. A branched electron transport pathway from H2 to O2 is proposed.<\/jats:p>","DOI":"10.1128\/jb.152.1.422-430.1982","type":"journal-article","created":{"date-parts":[[2021,6,2]],"date-time":"2021-06-02T23:15:41Z","timestamp":1622675741000},"page":"422-430","update-policy":"http:\/\/dx.doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":41,"title":["Electron transport components involved in hydrogen oxidation in free-living Rhizobium japonicum"],"prefix":"10.1128","volume":"152","author":[{"given":"M R","family":"O'Brian","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R J","family":"Maier","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"235","reference":[{"key":"p_1","doi-asserted-by":"crossref","first-page":"1255","DOI":"10.1126\/science.203.4386.1255","article-title":"Hydrogenase in Rhizobium japonicum increases nitrogen fixation by nodulated soybeans","volume":"203","author":"Albrecht S. 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