title: Sodium-dependent L-serine transport in plasma membrane vesicles isolated from Ehrlich cells by two-phase compartmentation.
abstract: Plasma membrane vesicles were prepared from Ehrlich cells using two-phase system compartmentation. The highly pure plasma membrane vesicles obtained presented a negligible mitochondrial contamination and were suitable for studies of amino acid transport. L-Serine transport showed a clear ionic specificity, maximum incorporation being observed when an inwardly directed NaSCN gradient was used. Na(+)-dependent L-serine transport was dependent on assay temperature and membrane potential, and it seemed to be carried out by two different transport systems. An essential sulfhydryl group seemed to be involved in the transport process.
authors.affiliation: Laboratorio de Bioquímica, Facultad de Ciencias, Universidad de Málaga, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Luque
authors.forename: J
authors.initials: J
authors.lastname: Márquez
authors.forename: I
authors.initials: I
authors.lastname: Núñez de Castro
authors.forename: M A
authors.initials: MA
authors.lastname: Medina
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D000818:Animals; D001692:Biological Transport; D002286:Carcinoma, Ehrlich Tumor; D002458:Cell Fractionation; D002462:Cell Membrane / Q000378:metabolism* / Q000648:ultrastructure; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012694:Serine / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism*; D013438:Sulfhydryl Compounds / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D000596:Amino Acids; D013438:Sulfhydryl Compounds; D012694:Serine; D012964:Sodium