title: Sodium-dependent succinate uptake in purple bacterium Ectothiorhodospira shaposhnikovii.
abstract: Succinate, malate and fumarate uptake in purple sulfur bacterium Ectothiorhodospira shaposhnikovii,. strain 1 K MSU, obligatorily depends on the presence of Na+. Other monovalent cations such as K+, Li+, NH4+ could not replace Na+. Experiments with energy-depleted cells have shown that succinate uptake against its concentration gradient can be energized by artifically imposed sodium gradients (delta pNa). An artificial membrane potential (inside negative) inhibited delta pNa-driven succinate uptake at pH 7.0 but stimulated it at pH 9.0. The results confirm the suggestion that succinate uptake in E. shaposhnikovii is carried out in symport with Na+.
mesh_terms: D001693:Biological Transport, Active / Q000187:drug effects; D002841:Chromatiaceae / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008564:Membrane Potentials; D012964:Sodium / Q000378:metabolism / Q000494:pharmacology*; D013386:Succinates / Q000378:metabolism*
chemical_list: D013386:Succinates; D012964:Sodium