title: Purification and subunit composition of atrial natriuretic peptide receptor.
abstract: A receptor for atrial natriuretic peptide (ANP) was purified 2700-fold, to apparent homogeneity, from cultured bovine aortic smooth muscle cells by affinity chromatography. The native ANP receptor has a molecular weight of 125,000 as determined by both metrizamide gradient centrifugation and nonreducing NaDodSO4/polyacrylamide gel electrophoresis. With 125I-labeled ANP as ligand, the purified receptor bound a maximum of 5.70 nmol of ligand per mg of protein and the dissociation constant was 4.0 X 10(-10)M. Upon treatment with 10 mM dithiothreitol, the purified receptor migrated as a single band at Mr 60,500 in NaDodSO4/polyacrylamide gel electrophoresis. These findings show that the holoreceptor for ANP in vascular tissue is composed of two subunits of identical apparent molecular weight, presumably linked by a disulfide bridge(s).
mesh_terms: D000818:Animals; D001011:Aorta / Q000032:analysis; D009320:Atrial Natriuretic Factor / Q000378:metabolism; D002417:Cattle; D002846:Chromatography, Affinity; D004591:Electrophoresis, Polyacrylamide Gel; D006162:Guanylate Cyclase / Q000032:analysis; D007457:Iodine Radioisotopes; D009131:Muscle, Smooth, Vascular / Q000032:analysis; D017461:Receptors, Atrial Natriuretic Factor; D011956:Receptors, Cell Surface / Q000032:analysis / Q000302:isolation & purification*
chemical_list: D007457:Iodine Radioisotopes; D011956:Receptors, Cell Surface; D009320:Atrial Natriuretic Factor; D006162:Guanylate Cyclase; D017461:Receptors, Atrial Natriuretic Factor