Polypeptide Heteromultimer Production Through CH3 Disulfide Isomerization
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Solution Overview
Problem
Existing methods for producing bispecific antibodies face challenges in achieving high reaction efficiency and stability due to random heterodimerization and homodimerization, leading to low production yields and complex purification processes.
Innovation Solution
A method involving amino acid substitutions in the heavy chain constant regions of polypeptides to control dissociation and association under reducing conditions, forming desired heteromultimers by eliminating disulfide bonds in core hinge regions and promoting isomerization between CH3 regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If amino acid substitution is applied to CH3 regions to promote heterodimerization, then production efficiency is improved, but purification difficulty increases
Solution Approach 1:
The patent applies local quality by introducing specific amino acid substitutions at defined positions in the CH3 region (e.g., position 409) to create asymmetric properties between heavy chains. This localized modification promotes heterodimerization while maintaining overall molecular structure integrity, resolving the contradiction between improved production efficiency and purification difficulty.
Solution Approach 2:
The patent employs asymmetry by substituting different amino acids at position 409 in different heavy chains (e.g., K409R in one chain, F405L in another). This asymmetric modification creates preferential heterodimerization while preventing homodimerization, thereby improving production efficiency and simplifying purification through enhanced specificity.
2Adaptability or versatility
If multiple gene types are coexpressed to produce bispecific antibodies, then functional versatility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying amino acid sequences at specific positions (e.g., position 409 in CH3 region) to alter the chemical properties and pairing preferences of heavy chains. This sequence-level parameter modification enables controlled heterodimerization of multiple gene products, achieving functional versatility while reducing manufacturing complexity through predictable self-assembly.
3Ease of manufacture
If common L chains are used in both Fabs to simplify production, then ease of manufacture is improved, but binding affinity stability deteriorates
Solution Approach 1:
The patent applies segmentation by separating the control mechanisms for heterodimerization into distinct functional regions: the CH3 region (positions 409) controls heavy chain pairing, while the L chain variable regions maintain independent antigen-binding specificity. This segmentation allows use of common L chains for simplified production while preserving binding affinity stability through independent variable region design.
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
Enhances the efficiency of heteromultimer production, improves purification convenience, and minimizes lot-to-lot variation, resulting in stable and high-yield bispecific antibodies.
Implementation Method 1
incubating the homologous form of the first polypeptide and the homologous form of the second polypeptide together under a reducing condition that allows cysteines outside of core hinge regions to cause disulfide bond isomerization
Data Source
AI summary
It is intended to provide a method for efficiently and stably producing a heteromultimer by incubating homo variants of plural types of heavy chain constant region-containing polypeptides differing in antigen-binding activity under a reducing condition that reorganize the inter-polypeptide disulfide bond between cysteine residues outside of core hinge regions. A feature of the production method of the present invention is that amino acid residues in the core hinge regions do not form any disulfide bond.