Abstract
Campylobacter sputorum subspeciesbubulus contains a membrane-bound nitrite reductase which catalyses the six-electron reduction of nitrite to ammonia. Formate andL-lactate are used as hydrogen donors. Cells ofC. sputorum grown with nitrate or nitrite contain cytochromes of theb-andc-type and a carbon monoxide-binding cytochromec. In addition, a special membrane-bound carbon monoxide-binding pigment is found. Nitrite reduction with formate orL-lactate as a hydrogen donor is strongly inhibited by 2-n-heptyl-4-hydroxyquinoline-N-oxide (HQNO). Nitrite reduction by bacterial suspensions with lactate as a hydrogen donor is strongly inhibited by carbonylcyanide-m-chlorophenyl-hydrazone (CCCP) whereas nitrite reduction with formate as a hydrogen donor is not inhibited at all. →H+/O values and →H+/NO -2 values were measured with ascorbate + N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD), formate (in the absence and presence of carbonic anhydrase) andL-lactate as a hydrogen donor. The results are summarized in a scheme for electron transport from formate or lactate to oxygen or nitrite which shows a periplasmic orientation of formate dehydrogenase and nitrite reductase and a cytoplasmic orientation of lactate dehydrogenase and oxygen reduction, and which shows proton translocation with a →H+/2e value of 2.0. The →H+/O and →H+/NO -2 values predicted by this scheme are in good agreement with the experimental values.
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Abbreviations
- CCCP:
-
carbonylcyanide-m-chlorophenylhydrazone
- HQNO:
-
2-n-heptyl-4-hydroxyquinoline-N-oxide
- MTPP+ :
-
methyltriphenylphosphonium cation
- TMPD:
-
N,N,N′,N′-tetramethyl-p-phenylenediamine; →H+/O (→H+/NO -2 ), number of protons liberated in the outer bulk phase at the reduction of one atom O (one ion NO -2 ); →H+/2e (→q+/2e), number of protons (charges) translocated across the cytoplasmic membrane during flow of two electrons to an acceptor
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de Vries, W., Niekus, H.G.D., van Berchum, H. et al. Electron transport-linked proton translocation at nitrite reduction inCampylobacter sputorum subspeciesbubulus . Arch. Microbiol. 131, 132–139 (1982). https://doi.org/10.1007/BF01053995
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DOI: https://doi.org/10.1007/BF01053995