title: Purification of the type I insulin-like growth factor receptor from human placenta.
abstract: The type I IGF receptor from human placental membranes was purified to near homogeneity by affinity chromatography on IGF I-Sepharose. SDS-polyacrylamide gel electrophoresis of the affinity purified type I IGF receptor demonstrated a high molecular weight protein with Mr greater than or equal to 300,000 under non-reducing conditions. After reduction with 2-mercaptoethanol two protein bands were found of Mr = 125,000 and 95,000, representing the alpha- and beta-subunits of the receptor molecule, respectively. A co-purification of the insulin receptor through the IGF I-affinity column could be avoided by a preincubation step with insulin.
mesh_terms: D002462:Cell Membrane / Q000378:metabolism; D002846:Chromatography, Affinity; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000378:metabolism; D008970:Molecular Weight; D010920:Placenta / Q000378:metabolism*; D011247:Pregnancy; D011956:Receptors, Cell Surface / Q000302:isolation & purification*; D017451:Receptors, Somatomedin
chemical_list: D011956:Receptors, Cell Surface; D017451:Receptors, Somatomedin; D007334:Insulin-Like Growth Factor I