Membrane H+ conductance of Streptococcus lactis.
Membrane conductance to H+ was measured in the anaerobic bacterium Streptoccus lactis by a pulse technique employing a low driving force (0.1 pH unit; 6 mV). Over the pH range of 3.7 to 8.5, a constant value for passive H+ conductance was observed, corresponding to 0.2 mumol of H+/s per p/ unit per g, dry weight (1.6 microS/cm2 of surface area). The pH insensitivity of this low basal H+ conductance supports the idea that a circulation of protons can mediate highly efficiency engery transductions across the membranes of bacteria.
D002462:Cell Membrane / Q000378:metabolism; D004024:Dicyclohexylcarbodiimide / Q000494:pharmacology; D004553:Electric Conductivity; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D013294:Lactococcus lactis / Q000187:drug effects / Q000378:metabolism*
D004024:Dicyclohexylcarbodiimide; D006859:Hydrogen