Mutant fgf-21 peptide pegylated conjugates and uses thereof

Abstract

The present invention relates to a mutant Fibroblast Growth Factor-21 (FGF-21) peptide conjugate comprising a PEG moiety attached to a mutant FGF-21 peptide via a glycosyl linker and uses thereof. Further provided is a method for producing the mutant FGF-21 peptide conjugate and a pharmaceutical composition and container comprising said mutant FGF-21 peptide conjugate.

1 . A mutant Fibroblast Growth Factor-21 (FGF-21) peptide conjugate comprising
 i) a mutant FGF-21 peptide comprising the amino acid sequence of SEQ ID NO: 2,   ii) a glycosyl moiety, and   iii) a 20 kDa polyethylene glycol (PEG),   wherein the mutant FGF-21 peptide is attached to the glycosyl moiety by a covalent bond between a threonine at amino acid position 173 of SEQ ID NO: 2 and a first site of the glycosyl moiety and wherein the glycosyl moiety is attached to the 20 kDa PEG by a covalent bond between a second site of the glycosyl moiety and the 20 kDa PEG; or a pharmaceutical composition comprising the mutant FGF-21 peptide conjugate and a pharmaceutically acceptable carrier.   
     
     
         2 . The mutant FGF-21 peptide conjugate according to  claim 1 , wherein the glycosyl moiety comprises at least one of an N-acetylgalactosamine (GalNAc) residue, a galactose (Gal) residue, a sialic acid (Sia) residue, a 5-amine analogue of a Sia residue, a mannose (Man) residue, mannosamine, a glucose (Glc) residue, an N-acetylglucosamine (GlcNAc) residue, a fucose residue, a xylose residue, or a combination thereof. 
     
     
         3 . The mutant FGF-21 peptide conjugate according to  claim 1 , wherein the glycosyl moiety comprises at least one of an N-acetylgalactosamine (GalNAc) residue, a galactose (Gal) residue, a sialic acid (Sia), or a combination thereof. 
     
     
         4 . The mutant FGF-21 peptide conjugate according to  claim 3 , wherein the at least one Sia residue is a nine-carbon carboxylated sugar. 
     
     
         5 . The mutant FGF-21 peptide conjugate according to  claim 4 , wherein the at least one Sia residue is N-acetyl-neuraminic acid (2-keto-5-acetamido-3,5-dideoxy-D-glycero-D-galactononulopyranos-1-onic acid (Neu5Ac), N-glycolylneuraminic acid (Neu5Gc), 2-keto-3-deoxy-nonulosonic acid (KDN), or a 9-substituted sialic acid. 
     
     
         6 . The mutant FGF-21 peptide conjugate according to  claim 5 , wherein the 9-substituted sialic acid is 9-O-lactyl-Neu5Ac, 9-O-acetyl-Neu5Ac, 9-deoxy-9-fluoro-Neu5Ac, or 9-azido-9-deoxy-Neu5Ac. 
     
     
         7 . The mutant FGF-21 peptide conjugate according to  claim 1 , wherein the glycosyl moiety comprises the structure
 -GalNAc-Sia-.   
     
     
         8 . The mutant FGF-21 peptide conjugate according to  claim 1 , wherein the 20 kDa PEG moiety is attached to the glycosyl moiety by a covalent bond to a linker, wherein the linker comprises at least one amino acid residue. 
     
     
         9 . The mutant FGF-21 peptide conjugate according to  claim 8 , wherein the at least one amino acid residue is a glycine (Gly). 
     
     
         10 . The mutant FGF-21 peptide conjugate according to  claim 1  comprising the structure
 -GalNAc-Sia-Gly-PEG (20 kDa). 
 
     
     
         11 . The mutant FGF-21 peptide conjugate according to  claim 1 , comprising the structure: 
       
         
           
           
               
               
           
         
         wherein n is an integer selected from 450 to 460. 
       
     
     
         12 . The mutant FGF-21 peptide conjugate according to  claim 1 , wherein the 20 kDa PEG is a linear or branched PEG. 
     
     
         13 . The mutant FGF-21 peptide conjugate according to  claim 1 , wherein the 20 kDa PEG is a 20 kDa methoxy-PEG. 
     
     
         14 . A method of producing the mutant FGF-21 peptide conjugate according to  claim 1 , comprising the steps of:
 (1) recombinantly producing the mutant FGF-21 peptide in an expression host; and   (2) enzymatically attaching to the mutant FGF-21 peptide of step (1) a PEG-glycosyl moiety, wherein the PEG has 20 kDa, thereby forming the mutant FGF-21 peptide conjugate.   
     
     
         15 . A method for treating diabetes or a diabetes related disease, comprising administering to a subject in need thereof an amount of the mutant FGF-21 peptide conjugate according to  claim 1  or the pharmaceutical composition according to  claim 1 . 
     
     
         16 . The method of  claim 15 , wherein the diabetes or the diabetes related disease comprises at least one of diabetes type 2, non-alcoholic steatohepatitis (NASH), or metabolic syndrome. 
     
     
         17 . The method according to  claim 15 , wherein the subject is a human subject. 
     
     
         18 . The method according to  claim 15 , wherein the administering reduces HbA1C levels, wherein reducing HbA1C levels is indicative of a durable reduction in blood glucose levels over time. 
     
     
         19 . The method of  claim 15 , wherein the mutant FGF-21 peptide conjugate is administered once a week or once every two weeks.