Preparation of a polymer/interleukin-2 conjugate
First Claim
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1. A pharmaceutically and therapeutically useful protein comprising a PEG or a polyoxyethylated polyol IL-2 conjugate made by contacting a PEG or a polyoxyethylated polyol, which has at least one hydroxyl group, with a chloroformate under the appropriate reaction conditions to form a PEG or a polyoxyethylated polyol active ester;
- and contacting the PEG or the polyoxyethylated polyol active ester with IL-2 under the appropriate reaction conditions to form a PEG/IL-2 conjugate or a polyoxyethylated polyol/IL-2 conjugate.
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Abstract
The present invention is a process for preparing a pharmaceutical composition comprising a biologically active conjugated protein. It comprises a polyethylene glycol or a polyoxyethylated polyol conjugated to IL-2. This protein is conjugated to reduce its immunogenicity, and increase its solubility, and increase its circulating in vivo half-life.
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11 Claims
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1. A pharmaceutically and therapeutically useful protein comprising a PEG or a polyoxyethylated polyol IL-2 conjugate made by contacting a PEG or a polyoxyethylated polyol, which has at least one hydroxyl group, with a chloroformate under the appropriate reaction conditions to form a PEG or a polyoxyethylated polyol active ester;
- and contacting the PEG or the polyoxyethylated polyol active ester with IL-2 under the appropriate reaction conditions to form a PEG/IL-2 conjugate or a polyoxyethylated polyol/IL-2 conjugate.
- 2. A PEG or a polyoxyethylated polyol IL-2 conjugate comprising PEG or a polyoxyethylated polyol covalently conjugated to IL-2 through a urethane bond.
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3. A PEG or a polyoxyethylated polyol IL-2 conjugate having the structure:
- ##STR4## wherein R is the PEG or the polyoxyethylated polyol.
- 8. A therapeutically useful formulation comprising a PEG/IL-2 conjugate, wherein the PEG is covalently attached to IL-2 via a urethane bond, and at least one pharmaceutically acceptable excipient.
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9. A PEG/IL-2 conjugate having the structure:
- ##STR5##
Specification