1
|
Goto T, Hirabayashi T, Morimoto H, Yamazaki K, Inoue N, Matsuyama H, Yumoto I. Contribution of intracellular negative ion capacity to Donnan effect across the membrane in alkaliphilic Bacillus spp. J Bioenerg Biomembr 2016; 48:87-96. [PMID: 26749514 DOI: 10.1007/s10863-015-9641-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 12/27/2015] [Indexed: 10/22/2022]
Abstract
To elucidate the energy production mechanism of alkaliphiles, the relationship between the H(+) extrusion rate by the respiratory chain and the corresponding ATP synthesis rate was determined in the facultative alkaliphile Bacillus cohnii YN-2000 and compared with those in the obligate alkaliphile Bacillus clarkii DSM 8720(T) and the neutralophile Bacillus subtilis IAM 1026. Under high aeration condition, much higher ATP synthesis rates and larger Δψ in the alkaliphilic Bacillus spp. grown at pH 10 than those in the neutralophilic B. subtilis grown at pH 7 were observed. This high ATP productivity could be attributed to the larger Δψ in alkaliphiles than in B. subtilis because the H(+) extrusion rate in alkaliphiles cannot account for the high ATP productivity. However, the large Δψ in the alkaliphiles could not be explained only by the H(+) translocation rate in the respiratory chain in alkaliphiles. There is a possibility that the Donnan effect across the membrane has the potential to contribute to the large Δψ. To estimate the contribution of the Donnan effect to the large Δψ in alkaliphilic Bacillus spp. grown at pH 10, intracellular negative ion capacity was examined. The intracellular negative ion capacities in alkaliphiles grown at pH 10 under high aeration condition corresponding to their intracellular pH (pH 8.1) were much higher than those in alkaliphiles grown under low aeration condition. A proportional relationship is revealed between the negative ion capacity and Δψ in alkaliphiles grown under different aeration conditions. This relationship strongly suggests that the intracellular negative ion capacity contributes to the formation of Δψ through the Donnan effect in alkaliphilic Bacillus spp. grown at pH 10.
Collapse
Affiliation(s)
- Toshitaka Goto
- Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan.,Bioproduction Research Insitute, National Institute of Advanced Science and Technology, 2-17-2-1, Tsukisamu-Higashi, Toyohira-ku, Sapporo, Hokkaido, 062-8517, Japan
| | - Toshinao Hirabayashi
- Department of Bioscience and Technology, School of Biological Science and Engineering, Tokai University, Minaminosawa, Minami-ku, Sapporo, Hokkaido, 005-8601, Japan
| | - Hajime Morimoto
- Department of Bioscience and Technology, School of Biological Science and Engineering, Tokai University, Minaminosawa, Minami-ku, Sapporo, Hokkaido, 005-8601, Japan
| | - Koji Yamazaki
- Department of Marine Bioresources Chemistry, Faculty of Fisheries, Hokkaido University, 3-1-1, Minoto-cho, Hakodate, Hokkaido, 041-0821, Japan
| | - Norio Inoue
- Department of Marine Bioresources Chemistry, Faculty of Fisheries, Hokkaido University, 3-1-1, Minoto-cho, Hakodate, Hokkaido, 041-0821, Japan
| | - Hidetoshi Matsuyama
- Department of Bioscience and Technology, School of Biological Science and Engineering, Tokai University, Minaminosawa, Minami-ku, Sapporo, Hokkaido, 005-8601, Japan
| | - Isao Yumoto
- Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo, Hokkaido, 060-8589, Japan. .,Bioproduction Research Insitute, National Institute of Advanced Science and Technology, 2-17-2-1, Tsukisamu-Higashi, Toyohira-ku, Sapporo, Hokkaido, 062-8517, Japan.
| |
Collapse
|
4
|
Koyama N, Nosoh Y. Effect of the pH of culture medium on the alkalophilicity of a species of Bacillus. Arch Microbiol 1976; 109:105-8. [PMID: 9043 DOI: 10.1007/bf00425120] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The amino acid incorporation and alpha-amino-isobutyric acid (AIB) uptake of an alkalophilic Bacillus grown at pH 8.2 (the pH 8-bacteria) were much less pH dependent (less alkalophilic) than those of the organisms grown at pH 10.0 (the pH 10-bacteria), respectively. The rate of AIB uptake of the pH 10-bacteria was almost the same as that of the pH 8-bacteria, while the rate of amino acid incorporation of the pH 10-bacteria was higher than that of the pH 8-bacteria in alkaline environments. The colloidal titration with clupein showed that the amount of negative charge on the pH 10-bacteria was greater than that of the pH 8-bacteria in alkaline environments. Considerable difference in protein composition was observed between the membranes of the pH 8- and 10-bacteria while no difference was observed in phospholipid composition.
Collapse
|