Low-viscosity antigen binding proteins and methods of making them
The present invention concerns a method for preparing antigen binding proteins with reduced viscosity. The method proceeds by replacing residues in high viscosity variable domain subfamilies with residues in correlating low viscosity subfamilies. The method further comprises substituting residues in the Fc domain with residues associated with low viscosity and adding charged residues to the C-terminus of the Fc domain. The present invention further concerns antigen binding proteins produced by this method.
1. An antigen binding protein that specifically binds to GIPR, wherein the antigen binding protein comprises sequences of SEQ ID NOS: 158 and 160, wherein the antigen binding protein further comprises one or more sequence modifications selected from:
a. a VH1|1-18 germline subfamily sequence comprising one or more substitutions selected from 82X 1 , 94X 2 , and 95X 3 , wherein X 1 is selected from R, K and H, X 2 is selected from S, T, N and Q and X 3 is selected from R, K, and H;
b. a VH313-33 germline subfamily sequence comprising one or more substitutions selected from 1X 4 , 17X 5 , and 85X 6 , wherein X 4 is selected from D and E, X 5 is selected from G, A, V, I, L, and M, and X 6 is selected from GA, V, I, L, and M;
c. a VK3 L 16 germline subfamily sequence comprising one or more substitutions selected from 4X 10 , 13X 11 , 76X 12 , 95X 13 , 97X 1 4, and 98P, wherein X 10 is selected from G, A, V, I, L, and M, X 11 is selected from G, A, V, I, L, and M, X 12 is selected from D and E, X 13 is selected from R, K and H, and X 14 is selected from D and E, wherein the antigen binding protein does not comprise only substitution 78F;
d. a VK3jL6 germline subfamily sequence comprising one or more substitutions selected from 76X 12 and 95X 13 ;
e. an Fe domain sequence comprising one or more substitutions selected from 253X 15 , 440X 16 , and 439X 17 , wherein X 15 is selected from G, A, V, I, L, and M, X 16 is selected from R, K, and H, and) X 17 is selected from D and E, wherein the Fc domain sequence comprises only one of 440X 16 and 439X 17 and wherein the antigen binding protein comprises at least one of 253X 15 or modifications selected from subparagraphs a, b, c, d and f when X 16 is K or X 17 is E and the antigen binding protein specifically binds CD20; and
f. an Fc domain sequence comprising X 18 X 19 at its C-terminus wherein X 18 is one to four amino acids selected from D and E or from H, K, and R, and X 19 is selected from P, M, G, A, V, I, L, S, T, N, Q F, Y and W and is absent when X 18 comprises D or E, is present when X 18 comprises K or R at its C-terminal end, and is present or absent when X 18 comprises H at its C-terminal end, and wherein the antigen binding protein comprises at least one of 253X 15 or substitutions selected from subparagraphs a through e when PGKP (SEQ ID NO:381), PGKKP (SEQ ID NO:382), PGKKKP (SEQ ID NO:383), or PGE appears at the C-terminus of the Fc domain and the antigen binding protein specifically binds CD20 or CD38;
wherein the amino acids in subparagraphs a, b, c, and d are numbered according to the Aho numbering system and the amino acids in subparagraph e are numbered according to the EU numbering system.
2. The antigen binding protein of claim 1 , wherein the VH1|1-18 germline subfamily sequence comprises one or more substitutions selected from 82R, 94S, and 95R.
3. The antigen binding protein of claim 1 , wherein the VH1|1-18 germline subfamily sequence comprises substitution 59X 2 ° wherein X 20 is selected from R, K and H.
4. The antigen binding protein of claim 1 , wherein the VH3|3-33 germline subfamily sequence comprises one or more substitutions selected from 1E, 17G, and 85A.
5. The antigen binding protein of claim 1 , wherein the VH3|3-33 germline subfamily sequence comprises substitutions 1E, 17G, and 85A.
6. The antigen binding protein of claim 1 , wherein the VK3|L16 sequence comprises one or more substitutions selected from 4L, 13L, 76D, 78F, 95R, 97E, and 98P.
7. The antigen binding protein of claim 1 , wherein the antigen binding protein comprises, prior to substitution:
a. a heavy chain framework 1 sequence of SEQ ID NO: 302;
b. a heavy chain framework 2 sequence of SEQ ID NO.: 342;
c. a heavy chain framework 3 sequence of SEQ ID NO.: 303;
d. a heavy chain framework 4 sequence of SEQ ID NO.: 276;
e. a light chain framework 1 sequence of SEQ ID NO.: 181;
f. a light chain framework 2 sequence of SEQ ID NO.: 194;
g. a light chain framework 3 sequence of SEQ ID NO.: 234; and
h. a light chain framework 4 sequence of SEQ ID NO.: 188.
8. The antigen binding protein of claim 1 comprising an amino acid sequence selected from SEQ ID NOS: 359, 361, 362, 364, and 368.
9. The antigen binding protein of claim 8 further comprising an amino acid sequence selected from SEQ ID NOS: 360, 363, 365, and 367.