GPRC5D Multi-Specific Polypeptide Complex for T-Cell Engagement
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Solution Overview
Problem
There is an urgent need for multi-specific antibodies that target GPRC5D, a 7-transmembrane protein overexpressed in tumor cells, particularly for treating multiple myeloma, to enhance therapeutic efficacy.
Innovation Solution
A multi-specific polypeptide complex is developed, comprising antigen binding domains that specifically target GPRC5D and other antigens like CD3 or Her2, with defined complementarity determining regions and variable regions, and optionally includes immunoglobulin constant regions, to enhance therapeutic efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monospecific antibodies are used, then the structure is simple and easy to manufacture, but the therapeutic efficacy is limited due to inability to target multiple antigens simultaneously
Solution Approach 1:
The patent combines multiple antigen-binding domains into a single polypeptide complex that can simultaneously bind to GPRC5D and other antigens (such as CD3, Her2, etc.). This merging of multiple specificities into one molecular entity enables the antibody to recruit different types of effector cells and regulate multiple signal pathways, thereby significantly enhancing therapeutic efficacy against multiple myeloma and other diseases while maintaining a unified structural framework
Solution Approach 2:
The multi-specific polypeptide complex is designed with universal applicability to target multiple antigens including GPRC5D (overexpressed in multiple myeloma), CD3 (on T cells), Her2 (on breast cancer cells), and other tumor-associated antigens. This multi-functional design allows a single therapeutic agent to address multiple disease mechanisms and target different cell types, making it versatile for treating various cancers and immune-related diseases
2Reliability
If multi-specific antibodies targeting multiple antigens are developed, then the therapeutic efficacy is enhanced, but the development complexity and time required increase significantly
Solution Approach 1:
The patent employs modular segmentation by dividing the multi-specific antibody into distinct antigen-binding domains, each targeting a specific antigen (GPRC5D, CD3, Her2, etc.). Each domain can be independently designed, optimized, and characterized, allowing parallel development of different specificity modules. This segmentation strategy reduces overall development time by enabling independent optimization of each binding domain while maintaining the ability to assemble them into a functional multi-specific complex
Solution Approach 2:
The patent utilizes parameter changes in the antigen-binding domains, specifically optimizing the complementarity determining regions (CDRs) to achieve high affinity and specificity for each target antigen. By systematically varying and optimizing CDR sequences for different antigens (GPRC5D, CD3, Her2), the development process can efficiently generate multiple high-specificity binding domains that can be combined into the final multi-specific therapeutic agent
3Adaptability or versatility
If multi-specific antibodies are developed to target GPRC5D and other antigens, then the ability to recruit effector cells and regulate signal pathways is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple antigen-binding specificities into a single polypeptide complex with a unified structure that includes domains for binding GPRC5D and other antigens (CD3, Her2, etc.). This consolidated design allows the complex to recruit multiple types of effector cells (T cells, NK cells, macrophages) and regulate diverse signal pathways simultaneously, enhancing versatility while streamlining manufacturing compared to using multiple separate antibodies
Data Source
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AI summary
A multi-specific polypeptide complex, an isolated polynucleotide encoding same, a pharmaceutical composition comprising same, and a use thereof.