One pot desialylation and glycopegylation of therapeutic peptides
First Claim
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1. A method of synthesizing a peptide conjugate comprising combining:
- (a) sialidase;
(b) an enzyme capable of catalyzing the transfer of a glycosyl linking group;
(c) a modified sugar; and
(d) a peptide,wherein the method comprises(i) a desialylation step in which the sialidase removes a sialic acid residue from the peptide, thereby forming a desialyated peptide, and(ii) a conjugation step in which the enzyme capable of catalyzing the transfer of a glycosyl linking group transfers a modified sugar moiety from the modified sugar to an amino acid or glycosyl residue of the peptide,which desialylation and conjugation steps are performed in the same vessel, thereby synthesizing the peptide conjugate.
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Abstract
The present invention provides conjugates between peptides and PEG moieties. The conjugates are linked via an intact glycosyl linking group that is interposed between and covalently attached to the peptide and the modifying group. The conjugates are formed from both glycosylated and unglycosylated peptides by the action of a glycosyltransferase. The glycosyltransferase ligates a modified sugar moiety onto either an amino acid or glycosyl residue on the peptide. Also provided are pharmaceutical formulations including the conjugates. Methods for preparing the conjugates are also within the scope of the invention.
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Citations
29 Claims
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1. A method of synthesizing a peptide conjugate comprising combining:
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(a) sialidase; (b) an enzyme capable of catalyzing the transfer of a glycosyl linking group; (c) a modified sugar; and (d) a peptide, wherein the method comprises (i) a desialylation step in which the sialidase removes a sialic acid residue from the peptide, thereby forming a desialyated peptide, and (ii) a conjugation step in which the enzyme capable of catalyzing the transfer of a glycosyl linking group transfers a modified sugar moiety from the modified sugar to an amino acid or glycosyl residue of the peptide, which desialylation and conjugation steps are performed in the same vessel, thereby synthesizing the peptide conjugate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification