Multivalent Antibody Linker Design for Aggregation Control
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Solution Overview
Problem
Conventional multivalent antibodies face challenges with stability and productivity due to easy aggregation and high variation in heavy and light chain combinations, making it difficult to isolate and purify the desired antibody form.
Innovation Solution
A multivalent antibody design where multiple heavy chain variable regions are linked via a CH1 domain or its fragment, specifically from the IgG4 subclass, with the linker consisting of the amino acid sequence at positions 1 to 14, including cysteine at position 14, to enhance stability and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple heavy chain and light chain combinations are expressed in one cell to create multivalent antibody, then antigen recognition capability is improved, but productivity and purification difficulty increase
Solution Approach 1:
The patent merges multiple heavy chain variable regions (VH1, VH2, VH3) into a single polypeptide chain connected by linkers, creating a unified heavy chain structure. This combining approach ensures that only one specific combination of heavy and light chains is produced per cell, eliminating the complexity of multiple combinations while maintaining multivalent antigen recognition capability.
Solution Approach 2:
The heavy chain is segmented into multiple domains (VH1-linker-VH2-linker-VH3) that can independently recognize different antigens. Each VH region functions as an independent antigen recognition unit, allowing the single polypeptide to achieve multivalent functionality without requiring multiple separate heavy and light chain combinations.
2Adaptability or versatility
If multiple heavy chain and light chain combinations are expressed in one cell, then multivalent antibody diversity is improved, but isolation and purification difficulty increase
Solution Approach 1:
By combining multiple VH regions into a single heavy chain polypeptide with defined linkers, the patent creates a homogeneous population of multivalent antibodies with identical molecular weights and structures. This uniformity enables straightforward isolation and purification using conventional techniques, eliminating the complexity of separating multiple antibody combinations.
Solution Approach 2:
The linker regions are specifically designed with particular amino acid sequences and lengths to provide optimal spacing and orientation between VH domains. This local structural optimization ensures each VH region maintains its antigen recognition capability while the overall structure remains uniform and purifiable.
3Length of moving object
If antigen recognition sites are linked closely together, then antibody size is reduced, but aggregation tendency increases and stability decreases
Solution Approach 1:
The linkers are designed with specific local properties including optimized amino acid sequences, lengths (e.g., 15-50 residues), and flexibility characteristics. These local quality adjustments ensure adequate spacing between antigen recognition sites, preventing aggregation while maintaining compact overall structure and high stability.
Solution Approach 2:
The patent systematically varies linker parameters such as length, amino acid composition, and flexibility to optimize the balance between compactness and stability. By adjusting these parameters, the antibody achieves reduced size without sacrificing stability or increasing aggregation tendency.
Data Source
Figure 1
AI summary
The present invention relates to a multivalent antibody comprising multiple heavy chain variable regions of antibody linked to each other via a linker comprising an amino acid sequence encoding an immunoglobulin domain or a fragment thereof.