Common Light Chain Antibody Library for Bispecific Chain Matching
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Solution Overview
Problem
The primary challenge in preparing bispecific antibodies is the issue of chain mismatch, which is addressed by developing a bispecific antibody configuration with a common light chain to avoid light chain mismatches and enable high-throughput generation of multi-specific antibodies.
Innovation Solution
An antibody library is designed with a common light chain encoded by IGKV3 or IGKV1 light chain germline genes, combined with highly diverse human antibody heavy chain sequences, enabling the construction of a library with heavy chain diversity and facilitating the generation of bispecific antibodies through panning with various antigens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bispecific antibody preparation methods are used, then bisspecific antibodies can be produced, but chain mismatch issues occur leading to reduced manufacturing precision
Solution Approach 1:
The patent merges the light chain sequences between the two arms of the bisspecific antibody, creating a common light chain that is shared by both heavy chains. This eliminates the light chain mismatch problem that occurs in conventional bisspecific antibodies where each arm has separate light chains, thereby improving chain matching accuracy and antibody consistency.
Solution Approach 2:
The common light chain serves multiple functions by pairing with both different heavy chains (anti-CD3 and anti-tumor-associated-antigen) to form functional antibody arms. This universal light chain design allows a single light chain sequence to support multiple antigen-binding specificities, resolving the chain mismatch issue while maintaining bisspecific functionality.
2Manufacturing precision
If various bisspecific antibody conformational platforms are developed to address chain mismatch, then chain matching improves, but device complexity increases
Solution Approach 1:
The patent introduces homogeneity into the light chain portion of the bisspecific antibody by using identical light chain sequences in both arms. This homogeneous design simplifies the overall antibody structure compared to other conformational platforms that require asymmetric configurations, knock-in-hole technologies, or miniaturized formats, thereby reducing structural complexity while maintaining chain matching accuracy.
3Reliability
If common light chain configuration is adopted, then light chain mismatch is avoided improving reliability, but heavy chain diversity requirements increase device complexity
Solution Approach 1:
The patent segments the antibody library construction process into two independent parts: a diverse heavy chain library and a fixed common light chain. This segmentation allows the heavy chains to maintain diversity for different antigen specificities while the light chain remains constant, simplifying library construction by decoupling the diversity requirement from the consistency requirement.
Solution Approach 2:
The common light chain acts as an intermediary that bridges different heavy chains with diverse antigen specificities. By introducing this intermediate element, the patent enables heavy chain diversity while maintaining light chain consistency, effectively mediating between the conflicting requirements of diversity and reliability.
Data Source
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AI summary
An antibody library containing a common light chain and having heavy chain diversity, and a method for preparing the antibody library. The use of the antibody library, which contains a common light chain and has heavy chain diversity, in the preparation of a bispecific antibody having a common light chain; and the prepared bispecific antibody, which contains a common light chain.