Bispecific Antibody Chain Pairing via CH1-CL Interface Charge Engineering
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Solution Overview
Problem
Current methods for producing bispecific antibodies are inefficient due to the challenge of purifying specific combinations of heavy and light chains, leading to low yields and reduced antigen affinity, as existing techniques either rely on physical obstacles or common light chains that compromise antigen binding specificity.
Innovation Solution
Regulating the association of heavy and light chains by modifying specific amino acid residues at the CH1 and CL interface to introduce electrical repulsion or attraction, allowing for the efficient production of bispecific antibodies with desired binding specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If physical obstacles (knob and hole) or electric charge repulsion are used in the CH3 region to regulate heavy chain association, then heterologous combination is improved, but the antigen affinity and binding specificity are reduced
Solution Approach 1:
The invention divides the antibody structure into distinct domains with independent functions: the CH3 region contains the regulatory knobs-and-holes or charge interactions for controlling heavy chain pairing, while the CH1-CL interface contains the antigen-binding determinants. This segmentation allows optimization of one region without compromising the other.
Solution Approach 2:
The invention applies different properties to different regions of the antibody molecule. The CH3 region is engineered with specific knobs-or-holes or charge patterns to control association, while the CH1-CL interface is designed to maintain high antigen affinity. Each region has locally optimized properties suited to its specific function.
2Device complexity
If a common light chain is used for both antigen A and antigen B, then production complexity is reduced, but antigen affinity is considerably lowered
Solution Approach 1:
The invention creates asymmetric pairing specificity at the CH1-CL interface through differential charge distributions. Each heavy chain- light chain pair has unique electrostatic characteristics that enable selective association, allowing different light chains to be used for different antigens while maintaining production efficiency.
3Productivity
If amino acid substitution is performed in the CH1 and CL domains to allow H chains and L chains to associate irrespectively, then production efficiency is improved, but binding specificity is insufficient
Solution Approach 1:
The invention pre-establishes the correct heavy chain-light chain pairing through electrostatic complementarity at the CH1-CL interface before antigen binding occurs. The charge-based recognition ensures that only the correct pairs form, guaranteeing binding specificity while enabling efficient production.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the efficient production of bispecific antibodies with regulated chain association, maintaining high antigen-binding affinity and specificity, thereby overcoming the inefficiencies of previous methods.
Implementation Method 1
amino acid residues having a positive charge and an amino acid residue having a negative charge, with each other at a given location in the constant region of the heavy chain (CH1) and in the constant region of the light chain
Implementation Method 2
amino acid residues having a positive charge and an amino acid residue having a negative charge, with each other at a given location in the constant region of the heavy chain (CH1) and in the constant region of the light chain
Data Source
AI summary
It was found that association between CH1 and CL can be suppressed by substituting amino acids that exist on the interface between CH1 and CL with electrically-charged amino acids, and that formation of heterogeneous molecules is enabled more efficiently than by introducing knobs into holes mutations into CH3 domain.