[Difference in ionic specificity of ATP synthesis in extremely alkalophilic sulfate-reducing and acetogenic bacteria].
Ionic specificity of oxidative phosphorylation was studied in Natroniella acetigena and 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 delta pH+ and delta pNa+ gradients was studied. As distinct from other marine and freshwater sulfate reducers and extremely alkaliphilic anaerobes, D. lacustre uses 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 delta 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.
Pitriuk
A V
AV
Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117811 Russia.
Pusheva
M A
MA
D000255:Adenosine Triphosphate / Q000096:biosynthesis*; D004734:Energy Metabolism; D006863:Hydrogen-Ion Concentration; D019633:Natronobacterium / Q000378:metabolism*; D013045:Species Specificity; D016999:Sulfur-Reducing Bacteria / Q000378:metabolism*; D014871:Water Microbiology
D000255:Adenosine Triphosphate