STABLE MULTIPLE ANTIGEN-BINDING ANTIBODY
The invention provides antibodies that bind to multiple antigens, said antibodies having at least two antibody light chain variable domains and two antibody heavy chain variable domains, wherein each light chain variable domain is linked to a heavy chain variable domain to form a VH/VL construct, and wherein at least one of the VH domains comprises a particular amino acid at AHo position 12, 103 and/or 144, and at least one of the VL domains comprises a particular amino acid at AHo position 47 and/or 50. Nucleic acid molecules, vectors and host cells for expression of the recombinant antibodies of the invention, methods for isolating them, and the use of said antibodies in medicine are also disclosed.
1 . A multiple antigen-binding antibody molecule comprising:
a) two heavy chain variable domains, one with specificity to antigen A (VH-A) and one with specificity for antigen B (VH-B), and
b) two light chain variable domains, one with specificity to antigen A (VL-A) and one with specificity for antigen B (VL-B),
wherein at least one of the two heavy chain variable domains comprises at least one of the following: a Serine at AHo position 12, a Serine or Threonine at AHo position 103, and a Serine or Threonine at AHo position 144; and/or
wherein at least one of the two light chain variable domains comprises an Arginine at AHo position 50.
2 . The multiple antigen-binding antibody of claim 1 , wherein VH-A is linked to VL-B by peptide linker 1 to form a VH-A/VL-B construct and VH-B is linked to VL-A by peptide linker 2 to form a VH-B/VL-A construct.
3 . The multiple antigen-binding antibody of claim 2 , wherein the VH-A/VL-B construct is in a VH-A-(linker 1)-VL-B orientation.
4 . The multiple antigen-binding antibody of claim 2 , wherein the VH-B/VL-A construct is in a VH-B-(linker 2)-VL-A orientation.
5 . The multiple antigen-binding antibody of claim 2 , wherein peptide linker 1 and peptide linker 2 each have 1-10 amino acids.
6 . The multiple antigen-binding antibody of claim 5 , wherein peptide linker 1 has the sequence of GGGGS (SEQ ID NO: 1) and peptide linker 2 has the sequence of GGGGS (SEQ ID NO: 1).
7 . The multiple antigen-binding antibody of claim 2 , wherein VH-A/VL-B construct is further linked to VH-B/VL-A construct by peptide linker 3.
8 . The multiple antigen-binding antibody of claim 7 , wherein peptide linker 3 has 10-30 amino acids.
9 . The multiple antigen-binding antibody of claim 8 , wherein peptide linker 3 has the sequence of (GGGGS) 4 (SEQ ID NO: 4).
10 . The multiple antigen-binding antibody of claim 1 , having the format VH-A-SEQ ID NO: 1-VL-B-SEQ ID NO: 4-VH-B-SEQ ID NO: 1-VL-A.
11 . The multiple antigen-binding antibody of claim 1 , wherein the VH-A is linked to VL-A to form a single chain antibody with specificity for antigen A (scFv A) and VH-B is linked to VL-B to form a single chain antibody with specificity for antigen B (scFv B).
12 . The multiple antigen-binding antibody of claim 11 , wherein the scFv-A is linked to the scFv-B in the following format: VH-A/VL-A-linker 3-VH-B/VL-B.
13 . The multiple antigen-binding antibody of claim 12 , wherein the linker 3 has the sequence of SEQ ID NO: 4.
14 . The multiple antigen-binding antibody of claim 1 , wherein at least one of the two light chain variable domains is or is derived from a human Vkappal family light chain variable region.
15 . The multiple antigen-binding antibody of claim 1 , wherein at least one of the two heavy chain variable domains is or is derived from a human VH3 family heavy chain variable region.
16 . The multiple antigen-binding antibody of claim 1 , wherein the VH domains and the VL domains comprise CDRs from a lagomorph.
17 . The multiple antigen-binding antibody of claim 1 , wherein VH-A and/or VH-B comprise Serine at AHo position 12, Threonine at AHo position 103, and Threonine at AHo position 144.
18 . The multiple antigen-binding antibody of claim 1 , wherein the Arginine at AHo position 50 of VL-A and/or VL-B is introduced by substitution.
19 . The multiple antigen-binding antibody of claim 1 , wherein at least one of Serine at AHo position 12, Serine or Threonine at AHo position 103, and Serine or Threonine at AHo position 144 of VH-A and/or VH-B are introduced by substitution.
20 . The multiple antigen-binding antibody of claim 1 , wherein the antibody is bivalent.
21 . The multiple antigen-binding antibody of claim 1 , wherein the antibody is bispecific.
22 . The multiple antigen-binding antibody of claim 1 , wherein at least one of the heavy chain variable domains comprises at least three of the following: threonine (T) at AHo position 24, valine (V) at AHo position 25, alanine (A) or glycine (G) at AHo position 56, lysine (K) at AHo position 82, threonine (T) at AHo position 84, valine (V) at AHo position 89 and arginine (R) at AHo position 108.
23 . A pharmaceutical composition comprising the multiple antigen-binding antibody of claim 1 .
24 . Use of the multiple antigen-binding antibody of claim 1 for diagnosis and/or treatment of a disease.