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Composition comprising single chain urokinase, nucleic acid encoding single chain urokinase, replicable vector comprising such nucleic acid, recombinant host cell transformed with such vector, method of preparation .....
Composition comprising single chain urokinase, nucleic acid encoding single chain urokinase, replicable vector comprising such nucleic acid, recombinant host cell transformed with such vector, method of preparation .....
Compsn. comprises a protease resistant single-chain urokinase (I). (I) may be prepd. by (a) providing nucleic acid encoding a protease-resistant amino acid sequence variant of single-chain urokinase, (b) transforming a host cell with the nucleic acid, (c) culturing the transformed host cell until the variant urokinase accumulates in the culture and (d) recovering the variant urokinase from the culture. (I) is produced by combining urokinase with an agent to complex with urokinase or by covalently modifying single-chain urokinase at sites of proteolysis. The target sites include Arg156 to Lys158 and, pref., the site at residues Lys135 to Lys136. Covalent modifications are accomplished by reacting native urokinase with derivatising reagents or by the recombinant synthesis of mutants having site specific substns., insertions or deletions of amino acid residues at target sites. Complexing agents such as antibodies bind to urokinase at the target sites or at flanking sites so that access to the sites by proteases is impeded or prevented.
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