title: Pituitary gonadotropic hormone from a chondrostean fish, starred sturgeon (Acipenser stellatus Pall.) III. Polymorphism.
abstract: Four biologically active fractions of gonadotropic hormone (aci-GTH-A, -B, -C, -D) were isolated and purified from acetonized pituitaries of the starred sturgeon (Acipenser stellatus Pall.). Their separation was achieved by DEAE-cellulose chromatography. Disc-electrophoresis and especially isoelectric focusing in polyacrylamide gel showed that each fraction contained several components. Not less than 15 different components as a whole with isoelectric points ranging from 4.5 to 7.0 could be counted in four aci-GTH preparations. All these components were active in toad oocyte maturation test. Only two of four preparations (aci-GTH-A and -D) were practically free of common components. All aci-GTH preparations were shown to be homogeneous and identical by molecular weight, sedimentation coefficient, sialic acid content, and some immunological properties. N-terminal amino acid analysis revealed tyrosine and leucine in all aci-GTH preparations, with the only exception of aci-GTH-D that contained an additional polypeptide with N-terminal glycine. No differences in the spectra of aci-GTH isoforms were found when pituitary extract, newly purified or 3 years older hormone preparations were submitted to isoelectric focusing.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002025:Bufonidae; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005399:Fishes / Q000378:metabolism*; D006065:Gonadotropins, Pituitary / Q000302:isolation & purification* / Q000494:pharmacology; D007525:Isoelectric Focusing; D008297:Male; D009865:Oocytes / Q000187:drug effects / Q000254:growth & development; D010902:Pituitary Gland / Q000032:analysis*; D011110:Polymorphism, Genetic
chemical_list: D006065:Gonadotropins, Pituitary