title: Binding proteins for linear renin-inhibiting peptides in basolateral plasma membranes of rat liver.
abstract: A linear hydrophobic peptide, (Code no. EMD 55068), a synthetic renin-antagonist, competitively inhibits the uptake of taurocholate and of another linear peptide (EMD 51921) but not of oleic acid, serine or thiamin hydrochloride into isolated rat liver cells. EMD 55068 was attached to a gel matrix at a position that is not involved in the protein ligand interaction. The gel matrix used did not interact nonspecifically with solubilized proteins from rat liver. The quantity of bound ligand was determined to be 3.6 mg/ml of gel matrix. In the fraction of EDTA extracted hydrophilic membrane-associated proteins, no binding proteins were detected. Affinity chromatography of integral plasma membrane proteins resulted in four protein bands with molecular masses of 46, 49, 53 and 56 kDa in SDS-PAGE. In contrast, solubilized plasma membrane proteins from AS-30D ascites hepatoma cells, which are unable to transport bile acids and linear peptides, did not bind specifically to the affinity matrix.
authors.affiliation: Institut für Pharmakologie und Toxikologie, Justus-Liebig-Universität Giessen, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Ziegler
authors.forename: U
authors.initials: U
authors.lastname: Sänger
mesh_terms: D000818:Animals; D001692:Biological Transport; D002462:Cell Membrane / Q000378:metabolism; D002793:Cholic Acids / Q000378:metabolism; D002846:Chromatography, Affinity; D004151:Dipeptides; D004492:Edetic Acid; D004591:Electrophoresis, Polyacrylamide Gel; D008297:Male; D015394:Molecular Structure; D009829:Oleic Acids / Q000378:metabolism; D009842:Oligopeptides / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D011719:Pyrazines / Q000737:chemistry / Q000378:metabolism*; D011743:Pyrimidines; D051381:Rats; D011919:Rats, Inbred Strains; D012083:Renin / Q000378:metabolism; D012694:Serine / Q000378:metabolism; D012995:Solubility; D013656:Taurocholic Acid / Q000378:metabolism; D013831:Thiamine / Q000378:metabolism; D000092502:Renin Inhibitors
chemical_list: D002793:Cholic Acids; D004151:Dipeptides; D004492:Edetic Acid; D009829:Oleic Acids; D009842:Oligopeptides; D011719:Pyrazines; D011743:Pyrimidines; D012083:Renin; D012694:Serine; D013656:Taurocholic Acid; D013831:Thiamine; D000092502:Renin Inhibitors; C073453:EMD 55450; C073454:EMD 55068; C070401:EMD 51921