ArticleJournal of bioenergetics and biomembranes2012
Relationship between rates of respiratory proton extrusion and ATP synthesis in obligately alkaliphilic Bacillus clarkii DSM 8720(T).
Article in Journal of bioenergetics and biomembranes, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 6 citations in OpenAlex.
- Differences in Bioenergetic Metabolism of Obligately AlkaliphilicFrontiers in microbiology · 2022Review
- Formation of Proton Motive Force Under Low-Aeration Alkaline Conditions in Alkaliphilic Bacteria.Frontiers in microbiology · 2018Review
- Contribution of intracellular negative ion capacity to Donnan effect across the membrane in alkaliphilic Bacillus spp.Journal of bioenergetics and biomembranes · 2016Article
- Bioenergetics and the role of soluble cytochromes C for alkaline adaptation in gram-negative alkaliphilic Pseudomonas.BioMed research international · 2015Review
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Authors and funding
6 authors at 3 institutions in 1 country.
Funding
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Abstract
To elucidate the energy production mechanism of alkaliphiles, the relationship between the rate of proton extrusion via the respiratory chain and the corresponding ATP synthesis rate was examined in obligately alkaliphilic Bacillus clarkii DSM 8720(T) and neutralophilic Bacillus subtilis IAM 1026. The oxygen consumption rate of B. subtilis IAM 1026 cells at pH 7 was approximately 2.5 times higher than that of B. clarkii DSM 8720(T) cells at pH 10. The H⁺/O ratio of B. clarkii DSM 8720(T) cells was approximately 1.8 times higher than that of B. subtilis IAM 1026 cells. On the basis of oxygen consumption rate and H⁺/O ratio, the rate of proton translocation via the respiratory chain in B. subtilis IAM 1026 is expected to be approximately 1.4 times higher than that in B. clarkii DSM 8720(T). Conversely, the rate of ATP synthesis in B. clarkii DSM 8720(T) at pH 10 was approximately 7.5 times higher than that in B. subtilis IAM 1026 at pH 7. It can be predicted that the difference in rate of ATP synthesis is due to the effect of transmembrane electrical potential (Δψ) on protons translocated via the respiratory chain. The Δψ values of B. clarkii DSM 8720(T) and B. subtilis IAM 1026 were estimated as -192 mV (pH 10) and -122 mV (pH 7), respectively. It is considered that the discrepancy between the rates of proton translocation and ATP synthesis between the strains used in this study is due to the difference in ATP production efficiency per translocated proton between the two strains caused by the difference in Δψ.
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