Glycoengineered antibody drug conjugates
The current disclosure provides binding polypeptides (e.g., antibodies), and targeting moiety conjugates thereof, comprising a site-specifically engineered glycan linkage within native or engineered glycans of the binding polypeptide. The current disclosure also provides nucleic acids encoding the antigen-binding polypeptides, recombinant expression vectors and host cells for making such antigen-binding polypeptides. Methods of using the antigen-binding polypeptides disclosed herein to treat disease are also provided.
1. A method of making an effector moiety conjugated antibody or antigen-binding fragment thereof comprising the steps of:
(a) reacting a cytidine monophosphate-sialic acid (CMP-sialic acid) derivative having the structure:
with a glycan attached to a glycosylation site of an antibody or antigen-binding fragment thereof to form a sialic acid derivative-conjugated antibody having the structure:
or antigen-binding fragment thereof through a sialylation reaction;
wherein R 1 is selected from the group consisting of NHC(O)CH 3 , NHC(O)CH 2 OH, —NHC(O)CH 2 CH 2 C(O)CH 3 , —NHC(O)CH 2 N 3 , —NHC(O)SH, —OH, and —N 3 ; and
(b) reacting the R 1 group of the sialic acid derivative-conjugated antibody or antigen-binding fragment from step (a) with an effector moiety selected from the group consisting of: a drug moiety, a cytotoxic agent, a targeting agent, a diagnostic agent, an anti-cancer agent, an anti-inflammatory agent, an anti-cancer agent, an anti-infective agent, and an anesthetic agent, to form the effector moiety conjugated antibody or antigen-binding fragment thereof using click chemistry,
wherein step (b) is performed in the absence of copper.
2. The method of claim 1 , wherein R 1 is N 3 .
3. The method of claim 1 , wherein the CMP-sialic acid derivative has the structure of:
4. The method of claim 2 , wherein the effector moiety comprises or is bound to a cyclooctyne.
5. The method of claim 4 , wherein the cyclooctyne is an azadibenzocyclooctyne.
6. The method of claim 4 , wherein the cyclooctyne is a monofluorinated cyclooctyne.
7. The method of claim 1 , wherein the antibody or antigen-binding fragment thereof is an antibody.
8. The method of claim 1 , wherein the antibody comprises an S298N mutant.
9. The method of claim 1 , wherein the antibody comprises a heavy chain of SEQ ID NO: 14 and a light chain of SEQ ID NO: 12.
10. The method of claim 1 , wherein step (a) is catalyzed by α2,6 sialyltransferase.
11. The method of claim 1 , wherein the effector moiety comprises a terminal aminooxy moiety or is bound to a moiety comprising an aminooxy derivative.
12. The method of claim 1 , wherein the effector moiety comprises a poly(ethylene glycol).
13. The method of claim 2 , wherein step (b) occurs at ambient temperatures.
14. The method of claim 2 , wherein the click reaction in step (b) is catalyzed by a metal other than copper.
15. The method of claim 1 , wherein the CMP-sialic acid derivative has the structure of:
16. The method of claim 1 , wherein the effector moiety comprises an alkyne or is bound to a moiety comprising an alkyne.
17. The method of claim 1 , wherein the product of the click reaction in step (b) forms a triazole ring.
18. The method of claim 4 , wherein the cyclooctyne is a difluorinated cyclooctyne.
19. The method of claim 1 , wherein the antibody or antigen-binding fragment thereof comprises an A114N mutant in the CH1 domain.
20. The method of claim 14 , wherein the metal is selected from the group consisting of ruthenium, nickel, palladium, platinum, iron, and a derivative thereof.
21. The method of claim 1 , wherein the effector moiety is selected from the following: