title: Citrate uptake in membrane vesicles of Klebsiella aerogenes.
abstract: In whole cells of Klebsiella aerogenes grown anaerobically on citrate as sole carbon source, citrate uptake is followed by rapid catabolism of the substrate via the inducible citrate fermentation pathway. Membrane vesicles prepared from such cells take up citrate but do not catabolize it. Vesicles process d-lactate dehydrogenase and the Na+-requiring oxalacetate decarboxylase. Citrate is taken up in the presence of Na+, and other monovalent cations, such as NH4+, Rb+, Cs+, or K+, do not substitute for Na+. Li+ appears to act synergistically with Na+. Citrate uptake is inhibited by N-2, cyanide, azide, sulfhydryl reagents, dinitrophenol, fluorcitrate, and hydroxycitrate.
mesh_terms: D000693:Anaerobiosis; D001386:Azides / Q000494:pharmacology; D002250:Carbon Radioisotopes; D002262:Carboxy-Lyases / Q000378:metabolism; D002458:Cell Fractionation; D002462:Cell Membrane / Q000201:enzymology / Q000378:metabolism; D002474:Cell-Free System; D002951:Citrates / Q000378:metabolism*; D003486:Cyanides / Q000494:pharmacology; D004140:Dinitrophenols / Q000494:pharmacology; D004579:Electron Transport; D007709:Klebsiella / Q000201:enzymology / Q000378:metabolism*; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D007773:Lactates / Q000378:metabolism; D008291:Malate Dehydrogenase / Q000378:metabolism; D007652:Oxo-Acid-Lyases / Q000378:metabolism; D011392:Proline / Q000378:metabolism; D013053:Spectrophotometry; D013237:Stereoisomerism; D013439:Sulfhydryl Reagents / Q000494:pharmacology
chemical_list: D001386:Azides; D002250:Carbon Radioisotopes; D002951:Citrates; D003486:Cyanides; D004140:Dinitrophenols; D007773:Lactates; D013439:Sulfhydryl Reagents; D011392:Proline; D007770:L-Lactate Dehydrogenase; D008291:Malate Dehydrogenase; D002262:Carboxy-Lyases; D007652:Oxo-Acid-Lyases