title: The streptokinase-human plasminogen activator complex. Composition and identity of a subcomponent with activator activity.
abstract: Reactions between purified plasminogen and streptokinase, labelled with (131)I and (125)I respectively, were investigated by polyacrylamide-gel discontinuous electrophoresis. A molecular complex consisting of both (131)I-labelled plasminogen and (125)I-labelled streptokinase migrated between plasminogen and streptokinase. This complex contained bovine plasminogen activator activity. The relative quantities of (131)I-labelled plasminogen and (125)I-labelled streptokinase in this complex were markedly affected by reaction conditions. A fragment that retained 50% or more of the parent activator activity was released from the complex after exposure to mercaptoethanol. This subcomponent had an estimated molecular weight of 70000, and contained both (131)I-labelled plasminogen and (125)I-labelled streptokinase.
mesh_terms: D000614:Aminocaproates; D002850:Chromatography, Gel; D004589:Electrophoresis, Disc; D005340:Fibrinogen; D006801:Humans; D007456:Iodine Isotopes; D046911:Macromolecular Substances; D008623:Mercaptoethanol; D008970:Molecular Weight; D010958:Plasminogen; D013300:Streptokinase
chemical_list: D000614:Aminocaproates; D007456:Iodine Isotopes; D046911:Macromolecular Substances; D008623:Mercaptoethanol; D005340:Fibrinogen; D010958:Plasminogen; D013300:Streptokinase