title: Purification of human alpha uterine protein.
abstract: Human alpha uterine protein (AUP) has been prepared from extracts of decudua by antibody affinity chromatography, DEAE Sepharose chromatography and by filtration through Sephadex G-150. This procedure yielded a protein fraction containing AUP, which was labelled with 125I by chloramine T. When analysed by SDS gel electrophoresis this radioiodinated protein fraction was found to contain predominantly a single species of protein which was precipitated by antibodies against AUP in antibody-antigen crossed electrophoresis. Rabbit anti-AUP precipitated 55-65% of the tracer in a double-antibody system. Sephadex G150 gel filtration of AUP obtained before and after affinity chromatography provided a molecular weight estimate of 50000. Since SDS gel electrophoresis revealed a polypeptide molecular weight of 23000-25000, it is suggested that AUP is a dimer.
mesh_terms: D002846:Chromatography, Affinity; D002850:Chromatography, Gel; D003656:Decidua / Q000032:analysis*; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006023:Glycoproteins / Q000302:isolation & purification*; D006801:Humans; D007123:Immunoelectrophoresis, Two-Dimensional; D008970:Molecular Weight; D011247:Pregnancy; D014598:Uteroglobin / Q000302:isolation & purification*
chemical_list: D006023:Glycoproteins; D014598:Uteroglobin