title: Isolation and biochemical characterization of the plasma membrane of Tritrichomonas foetus.
abstract: A fraction containing plasma membrane-enriched vesicles has been prepared from Tritrichomonas foetus. Cells were ruptured using a Potter type homogenizer, under well controlled conditions, and membranes were isolated by differential centrifugation and in discontinuous sucrose gradient. This fraction was enriched 8 and 10-fold in the plasma membrane marker enzymes 5'-nucleotidase and (Na+ + K+)-dependent, ouabain-sensitive ATPase, respectively. Determination of Glucose-6-phosphatase and NADPH cytochrome c reductase activities in this fraction, indicates a minimal contamination with endoplasmic reticulum membranes. Analysis by Sodium Dodecyl Sulfate-Polyacrylamide (SDS-PAGE) gradient gel showed that the plasma membrane fraction contains several proteins with major bands corresponding to apparent molecular weights of 48, 45, 39, 37, 32, 30, 27, 23, 20, 19, 17, and 15 kDa.
authors.affiliation: Laboratorio de Ultraestrutura Celular Hertha Meyer, Instituto de Biofísica Carlos Chagas Filho Universidade Federal do Rio de Janeiro, Brasil.
authors.forename: J A
authors.initials: JA
authors.lastname: Díaz
authors.forename: L H
authors.initials: LH
authors.lastname: Monteiro-Leal
authors.forename: W
authors.initials: W
authors.lastname: de Souza
mesh_terms: D000818:Animals; D015415:Biomarkers / Q000032:analysis; D002458:Cell Fractionation; D002462:Cell Membrane / Q000737:chemistry* / Q000201:enzymology; D004591:Electrophoresis, Polyacrylamide Gel; D008565:Membrane Proteins / Q000032:analysis / Q000302:isolation & purification; D008854:Microscopy, Electron; D013347:Subcellular Fractions / Q000737:chemistry; D016835:Tritrichomonas foetus / Q000737:chemistry* / Q000648:ultrastructure
chemical_list: D015415:Biomarkers; D008565:Membrane Proteins