Multispecific Antibody Design via Domain Segmentation
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Solution Overview
Problem
Current bispecific antibodies face challenges in production, yield, and homogeneity, limiting their effectiveness and specificity in targeting multiple biological targets.
Innovation Solution
Development of a multispecific protein format that allows for the use of a wide range of antibody variable regions, adapted for standard recombinant production techniques, with a dimeric Fc domain for enhanced binding to activating receptors like CD16A.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional bispecific antibody formats (BiTe, DART) are used, then two different epitopes can be targeted simultaneously, but production is difficult, cell development is lengthy, and production yields are low
Solution Approach 1:
The antibody is divided into separate Fab domains (variable regions) and Fc domains (constant regions). The Fab domains are engineered to bind specific epitopes while the Fc domains mediate effector cell engagement. This segmentation allows independent optimization of binding specificity and production characteristics, resolving the contradiction between versatility and productivity.
Solution Approach 2:
The Fc domains are designed to universally bind to activating receptors (such as CD16A) on effector cells, while the Fab domains provide specific antigen binding. This multi-functionality allows the same Fc domain structure to be used across different bispecific antibody variants, standardizing production and improving yields while maintaining the ability to target different epitopes.
2Reliability
If BiTe antibody format is used to activate T-cells, then T-cell activation can be achieved in proximity to tumor cells, but the antibodies are difficult to produce and cannot be produced as a homogenous protein composition
Solution Approach 1:
Different domains of the antibody are assigned different functional qualities: the Fab domains are optimized for high-affinity antigen binding with specific structural characteristics, while the Fc domains are optimized for effector cell engagement and production homogeneity. This local differentiation of functional qualities allows T-cell activation capability to be maintained while improving manufacturing precision and protein composition uniformity.
3Ease of manufacture
If conventional antibody formats are used, then standard production techniques can be applied, but the ability to bind multiple biological targets and provide immune-enhancing activity is limited
Solution Approach 1:
The antibody structure employs asymmetric domain arrangement where Fab domains from different parent antibodies are combined with Fc domains in a non-symmetric configuration. This asymmetry enables simultaneous binding to different antigens (via diverse Fab domains) and activating receptors (via Fc domains), providing multi-target capability while maintaining compatibility with standard recombinant production techniques through modular domain assembly.
Data Source
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AI summary
Multimeric multispecific proteins formed from dimerization between CH1 and CK domains and that bind two target antigens are provided. The proteins have advantages in production and in the treatment of disease, notably cancer or infectious disease.