METHOD FOR PREPARATION OF SITE-SPECIFIC PROTEIN CONJUGATES

摘要

The invention is directed to a single-step method for rapidly and efficientl y preparing protein-polymer conjugates, including an insulin-polymer conjugate . According to the method of the present invention, a protein and hydrophilic polymer are contacted in the presence of at least one organic solvent and at least one metal chelator, under conditions that promote the formation of a conjugate of the protein and polymer. Thus, the invention is directed to the site-specific modification of selected proteins, such as insulin, with poly(ethylene glycol) at residue PheB 1. The invention also provides a pharmaceutical formulation for encapsulating the conjugate in a biodegradabl e polymer.