Abstract
Campylobacter sputorum subsp. bubulus contained hydrogenase activity after growth with lactate and nitrate and after growth with hydrogen and nitrate. After growth with hydrogen and nitrate a molar growth yield (g dry cells/mol hydrogen) of 5.6 was measured. Hydrogenase and nitrate reductase were membrane-bound enzymes. In cells with high hydrogenase activity the →H+/O, →H+/NO sup-inf2 and →H+/NO sup-inf3 values with hydrogen as the electron donor were 3.74, 2.61 and 4.36 respectively. In cells with low hydrogenase activity these values were 2.33,-0.86 and 1.31 respectively. These values and the stoichiometry of respiration-driven proton translocation (→H+/2e=2) led to the conclusion that hydrogenase is located at the periplasmic side of the cytoplasmic membrane. In cells with low lactate dehydrogenase activity or low hydrogenase activity the reduction of nitrate to nitrite could be separated from the reduction of nitrite to ammonia. Positive →H+/NO sup-inf3 values (between 0.9 and 1.7) with lactate or hydrogen as the electron donor were measured in these cells whereas →H+/NO sup-inf2 values were negative. From this result it was concluded that nitrate reductase is located at the cytoplasmic face of the cytoplasmic membrane. The results explain the previous observation that molar growth yields with nitrate were somewhat higher than those with nitrite.
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de Vries, W., van Berchum, H. & Stouthamer, A.H. Localization of hydrogenase and nitrate reductase in Campylobacter sputorum subsp. bubulus . Antonie van Leeuwenhoek 50, 63–73 (1984). https://doi.org/10.1007/BF00404908
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DOI: https://doi.org/10.1007/BF00404908