Sodium ion-proton antiport in a marine bacterium.
Alteromonas haloplanktis ejected protons in response to a brief respiratory pulse; the rate of decay of the resulting pH change was accelerated when Na+ was present in the suspension medium. The addition of an anaerobic NaCl solution to an essentially Na+-free anaerobic bacterial suspension induced the acidification of the suspension medium. These results and others discussed provide substantial evidence for the existence of an Na+-H+ antiporter in this organism.
D000693:Anaerobiosis; D001692:Biological Transport / Q000187:drug effects; D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone / Q000494:pharmacology; D002259:Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone / Q000494:pharmacology; D002462:Cell Membrane / Q000378:metabolism; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D011522:Protons; D011549:Pseudomonas / Q000378:metabolism*; D012623:Seawater; D012964:Sodium / Q000378:metabolism*; D014871:Water Microbiology
D011522:Protons; D002259:Carbonyl Cyanide p-Trifluoromethoxyphenylhydrazone; D002258:Carbonyl Cyanide m-Chlorophenyl Hydrazone; D006859:Hydrogen; D012964:Sodium