Aggregate-free urate oxidase for preparation of non-immunogenic polymer conjugates
First Claim
1. A purified urate oxidase (uricase) wherein greater than 95% of said uricase is in the tetrameric and octameric forms.
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Abstract
A naturally occurring or recombinant protein, especially a mutein of porcine urate oxidase (uricase), that is essentially free of large aggregates can be rendered substantially non-immunogenic by conjugation with a sufficiently small number of strands of polymer such that the bioactivity of the protein is essentially retained in the conjugate. Such conjugates are unusually well suited for treatment of chronic conditions because they are less likely to induce the formation of antibodies and/or accelerated clearance than are similar conjugates prepared from protein preparations containing traces of large aggregates.
57 Citations
40 Claims
- 1. A purified urate oxidase (uricase) wherein greater than 95% of said uricase is in the tetrameric and octameric forms.
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17. A purified chimeric urate oxidase (uricase), wherein greater than 95% of said uricase is in the tetrameric and octameric forms and wherein said chimeric uricase is porcine uricase in which arginine residue 291 of SEQ ID NO:
- 1 has been replaced by lysine (R291K) and threonine residue 301 of SEQ ID NO;
1 has been replaced by serine (T301S) (PKS uricase).
- 1 has been replaced by lysine (R291K) and threonine residue 301 of SEQ ID NO;
- 18. A conjugate comprising a purified urate oxidase (uricase) conjugated to poly(ethylene glycol) or poly(ethylene oxide), wherein greater than 95% of said uricase is in the tetrameric and octameric forms.
- 29. A purified fragment of urate oxidase (uricase), wherein said fragment is a recombinant uricase that has been truncated at the amino terminus, at the carboxyl terminus, or at both the amino and carboxyl termini, and wherein greater than 95% of said truncated uricase is in the tetrameric and octameric forms.
- 31. A conjugate comprising a purified urate oxidase (uricase) conjugated to poly(ethylene glycol) or poly(ethylene oxide), wherein greater than 95% of said uricase is in the tetrameric and octameric forms and wherein the average number of strands of said poly(ethylene glycol) or poly(ethylene oxide) conjugated to said uricase is between about 2 and about 10 per uricase subunit.
- 35. A conjugate comprising a purified urate oxidase (uricase) conjugated to poly(ethylene glycol) or poly(ethylene oxide), wherein greater than 95% of said uricase is in the tetrameric and octameric forms, wherein the average number of strands of said poly(ethylene glycol) or poly(ethylene oxide) conjugated to said uricase is between about 2 and 10 per uricase subunit and wherein said poly(ethylene glycol) or poly(ethylene oxide) has an average molecular weight of about 10 kDa to 60 kDa.
- 37. A pharmaceutical composition for lowering uric acid levels in a body fluid or tissue, comprising a purified urate oxidase (uricase) conjugated to poly(ethylene glycol) or poly(ethylene oxide) and a pharmaceutically acceptable carrier, wherein greater than 95% of said uricase is in the tetrameric and octameric forms.
- 39. An isolated urate oxidase (uricase) prepared by a method comprising separating uricase aggregates larger than octamers from uricase tetramers and octamers and excluding such aggregates from the isolated uricase, wherein greater than 95% of said isolated uricase is in the tetrameric and octameric forms.
Specification