Antibody Library Diversity via VH CDR2 Position 52 Mutations
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Solution Overview
Problem
Existing antibody display libraries, such as ETH2-Gold, may be biased towards recognizing certain structural features of antigen epitopes, limiting the diversity of epitope binding and potentially restricting the selection of antibodies that can recognize a wide variety of antigen epitopes.
Innovation Solution
The development of new antibody display libraries, Philo1 and Philo2, which introduce mutations in the VH domain's CDR2 position 52, allowing for greater diversity in epitope recognition by incorporating different amino acids at this position, such as Lys or Asp in Philo1, and Asn or Tyr in Philo2, while maintaining the stability and expression capabilities of the ETH2-Gold library.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing antibody display libraries like ETH2-Gold are used, then stability and expression efficiency are maintained, but epitope recognition diversity is limited due to bias towards certain structural features
Solution Approach 1:
The patent applies local quality by introducing mutations specifically at position 52 in the VH CDR2 region while keeping the rest of the antibody framework unchanged. This localized modification allows exploration of diverse epitope specificities without compromising the overall structural stability and expression efficiency provided by the proven ETH2-Gold library framework.
Solution Approach 2:
The patent implements parameter changes by systematically varying the amino acid residue at position 52 in the VH CDR2 region across different antibody clones in the library. This single parameter change (residue identity at position 52) generates diversity in epitope recognition while maintaining consistent structural parameters elsewhere in the antibody molecule.
2Adaptability or versatility
If a single germline VH segment is used in the library, then structural consistency is maintained, but the range of recognizable epitopes is restricted
Solution Approach 1:
The patent applies segmentation by dividing the antibody variable region into distinct functional segments: a conserved framework (DP47 VH germline segment) that maintains structural integrity, and a variable segment (position 52 in CDR2) that provides epitope-specific diversity. This segmentation allows independent optimization of stability and diversity.
Solution Approach 2:
The patent implements universality by using a single germline VH segment (DP47) that serves multiple functions: providing a stable structural framework, ensuring efficient expression, and enabling diverse epitope recognition through variation at position 52. This universal framework can be combined with different light chain segments to further expand functionality.
Data Source
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AI summary
Synthetic antibody display library containing human germline antibody molecules with variation in VH CDR3 and VL CDR3 and at position 52 of VH CDR2, for screening and selection of antibody molecules specific for antigens of interest.