Different Ionic Specificities of ATP Synthesis in Extremely Alkaliphilic Sulfate-Reducing and Acetogenic Bacteria |
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Authors: | A V Pitryuk M A Pusheva |
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Institution: | (1) Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117811, Russia |
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Abstract: | Ionic specificity of oxidative phosphorylation was studied in Natroniella acetigenaand Desulfonatronum lacustre, which are new alkaliphilic anaerobes that were isolated from soda lakes and have a pH growth optimum of 9.5–9.7. The ability of their cells to synthesize ATP in response to the imposition of artificial pH+and pNa+gradients was studied. As distinct from other marine and freshwater sulfate reducers and extremely alkaliphilic anaerobes, D. lacustreuses a Na+-translocating ATPase for ATP synthesis. The alkaliphilic acetogen N. acetigena, which develops at a much higher Na+concentration in the medium, generated primary pH+for ATP synthesis. Thus, the high Na+concentrations and alkaline pH values typical of soda lakes do not predetermine the type of bioenergetics of their inhabitants. |
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Keywords: | alkaliphiles anaerobes homoacetogens sulfate reducers Na+-ATP synthase H+-ATP synthase bioenergetics |
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