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- W2348596490 abstract "Resting cells from free-living Rhizobium astragalus were used to study electron transport components involved in H_2 oxidation. H_2-reduced minus O_2-oxidized absorption difference spectra revealed peaks at 552,560 and 603 nm (Fig. 1, Table 1). The electron transport inhibitors rotenone, dibromothymoquinon. (DBMIB), 2-n-hyeptyl-4-hydroxy-quinoline-N-oxide (HQNO), antimycin A, cyanide and azide inhibited H_2 uptake significantly (Table 2, 3), indicating the involvement of cytochromes c, b and a-a_3 respectively in the electron transport. The inhibition by rotenone was anticompetitive (Fig. 4) and that by DBMIB, HQNO, cyanide and azide was noncompetitive (Fig. 2,3,5). Dixon plots (1/v versus inhibitor concentration) were used to determine the number of inhibitor binding sites which wasind icated by the number of different slopes of line of H_2 oxidation. Rotenone and DBMIB has one site each and HQNO and cyanide has two sites each. The disappearence of binding sites which were sensitive to cyanide (Fig. 6) was due to the partial inhibition by HQNO. In the presence of rotenone and HQNO additive inhibition was observed (Table 4), indicating that two kinds of cytochrome b were involved in the H_2 oxidation. A branched electron transport pathway from H_2 to O_2 is proposed, with thebranching point localized at cytochromeb (Fig. 3), and each branch of the pathway has different sensitivity to cyanide inhibition (Fig. 7)." @default.
- W2348596490 created "2016-06-24" @default.
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- W2348596490 date "1990-01-01" @default.
- W2348596490 modified "2023-09-25" @default.
- W2348596490 title "Electron Transport Components Involved in Hydrogen Oxidation in Free-living Rhizobium astragalus" @default.
- W2348596490 hasPublicationYear "1990" @default.
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