title: Immunochemical studies of high and low molecular forms of urokinase.
abstract: The immunochemical properties of high and low molecular forms of urokinase (HMW-UK, MW 53,000, 124,000 IU/mg protein; LMW-UK, MW 32,000, 230,000 IU/mg protein) were studied with specific antisera against the functionally active heavy chain (H chain, MW 31,000, 201,000 IU/mg protein) and the light chain (L chain, MW 18,000) of HMW-UK. Using a double immunodiffusion technique, LMW-UK did not demonstrate L chain antigenicity in the molecule. Anti-L-chain serum exerted no effect on LMW-UK and the H chain, but anti-H-chain serum strongly inhibited the fibrinolytic activity of all the active enzymes (HMW-UK, LMW-UK, and H chain). Anti-L chain serum was found to exert an antifibrinolytic effect on HMW-UK.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D001665:Binding Sites; D010450:Endopeptidases / Q000276:immunology*; D005337:Fibrin / Q000378:metabolism; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D008970:Molecular Weight; D011487:Protein Conformation; D011817:Rabbits; D014568:Urokinase-Type Plasminogen Activator / Q000276:immunology* / Q000378:metabolism
chemical_list: D007106:Immune Sera; D005337:Fibrin; D010450:Endopeptidases; D014568:Urokinase-Type Plasminogen Activator