Methods for affinity maturation-based antibody optimization
First Claim
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1. A method of affinity maturation of a first antibody for a target antigen, comprising:
- a) identifying a related antibody that exhibits a reduced affinity for the target antigen than the corresponding form of a first antibody by screening a spatially addressable combinatorial antibody library, wherein the related antibody contains a related variable heavy chain or a related variable light chain that is either;
one in which the corresponding variable heavy chain and variable light chain of the related antibody exhibits at least 75% amino acid sequence identity to the corresponding variable heavy chain or variable light chain of the first antibody but does not exhibit 100% sequence identity therewith;
orone in which at least one of the VH, DH, and JH germline segments of a nucleic acid molecule encoding the variable heavy chain of the related antibody is from the same gene family as one of the VH, DH, and JH germline segments of the nucleic acid molecule encoding the variable heavy chain of the first antibody and at least one of the Vκ
and Jκ
or at least one of the Vλ
and Jλ
germline segments of the nucleic acid molecule encoding the variable light chain is from the same gene family as to one of the Vκ
and Jκ
or Vλ
and Jλ
germline segments of the nucleic acid molecule encoding the variable light chain of the first antibody; and
b) comparing the amino acid sequence of the variable heavy chain or variable light chain of the first antibody to the amino acid sequence of the corresponding related variable heavy chain or variable light chain of the related antibody;
c) identifying a target region within the variable heavy chain or variable light chain of a first antibody wherein the target region exhibits at least one amino acid difference compared to the same region in the related antibody;
d) producing a plurality of modified antibodies each comprising a variable heavy chain and a variable light chain wherein at least one of the variable heavy chain or variable light chain is modified in its target region by replacement of a single amino acid residue, whereby the target region in each of the plurality of antibodies contains replacement of an amino acid to a different amino acid compared to the first antibody;
e) screening each of the plurality of modified antibodies for an affinity to the target antigen; and
f) selecting those modified antibodies that exhibit increased affinity for the target antigen compared to the first antibody.
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Abstract
Provided herein is a rational method of affinity maturation to evolve the activity of an antibody or portion thereof based on the structure/affinity or activity relationship of an antibody. The resulting affinity matured antibodies exhibit improved or optimized binding affinity for a target antigen.
17 Citations
38 Claims
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1. A method of affinity maturation of a first antibody for a target antigen, comprising:
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a) identifying a related antibody that exhibits a reduced affinity for the target antigen than the corresponding form of a first antibody by screening a spatially addressable combinatorial antibody library, wherein the related antibody contains a related variable heavy chain or a related variable light chain that is either; one in which the corresponding variable heavy chain and variable light chain of the related antibody exhibits at least 75% amino acid sequence identity to the corresponding variable heavy chain or variable light chain of the first antibody but does not exhibit 100% sequence identity therewith;
orone in which at least one of the VH, DH, and JH germline segments of a nucleic acid molecule encoding the variable heavy chain of the related antibody is from the same gene family as one of the VH, DH, and JH germline segments of the nucleic acid molecule encoding the variable heavy chain of the first antibody and at least one of the Vκ
and Jκ
or at least one of the Vλ
and Jλ
germline segments of the nucleic acid molecule encoding the variable light chain is from the same gene family as to one of the Vκ
and Jκ
or Vλ
and Jλ
germline segments of the nucleic acid molecule encoding the variable light chain of the first antibody; andb) comparing the amino acid sequence of the variable heavy chain or variable light chain of the first antibody to the amino acid sequence of the corresponding related variable heavy chain or variable light chain of the related antibody; c) identifying a target region within the variable heavy chain or variable light chain of a first antibody wherein the target region exhibits at least one amino acid difference compared to the same region in the related antibody; d) producing a plurality of modified antibodies each comprising a variable heavy chain and a variable light chain wherein at least one of the variable heavy chain or variable light chain is modified in its target region by replacement of a single amino acid residue, whereby the target region in each of the plurality of antibodies contains replacement of an amino acid to a different amino acid compared to the first antibody; e) screening each of the plurality of modified antibodies for an affinity to the target antigen; and f) selecting those modified antibodies that exhibit increased affinity for the target antigen compared to the first antibody. - 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, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification