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. 1980 Dec;144(3):975–982. doi: 10.1128/jb.144.3.975-982.1980

Inhibition, but not uncoupling, of respiratory energy coupling of three bacterial species by nitrite.

J B Rake, R G Eagon
PMCID: PMC294760  PMID: 6777373

Abstract

The effect of nitrite on respiratory energy coupling of three bacteria was studied in light of a recent report that nitrite acted as an uncoupling agent with Paracoccus denitrificans grown under denitrifying conditions. Our determinations of proton translocation stoichiometry of Pseudomonas putida (aerobically grown), Pseudomonas aeruginosa, and P. denitrificans (grown both aerobically and under denitrifying conditions) showed nitrite inhibition of proton-to-oxidant stoichiometry, but not uncoupling. Nitrite both reduced the H+/O ratio and decreased the rate of proton resorption. Increased proton resorption rates, characteristic of authentic uncoupling agents, were not observed. The lack of enhanced proton permeability due to nitrite was verified via passive proton permeability assays. The H+/O ratio of P. aeruginosa increased when growth conditions were changed from aerobic to denitrifying. This suggested the induction of an additional coupling site in the electron transport chain of denitrifying P. aeruginosa.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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