Multispecific Antibody Linker Optimization for Spatial Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current bispecific and trispecific antibodies face challenges in delivering intended biological activity due to a lack of knowledge about the spatial position of epitopes and therapeutic targets, leading to suboptimal on-target activity and increased off-target activity.
Innovation Solution
A multispecific antibody construct is designed with specific linker peptides of varying lengths and sequences to optimize antigen engagement, comprising an antibody Fc region, heavy chain constructs with scFv modules, and light chain constructs, allowing for precise binding to epitopes on different or the same polypeptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bispecific antibody formats are used, then the structural framework is established, but the spatial positioning of antigen binding domains cannot be optimized leading to suboptimal on-target activity
Solution Approach 1:
The patent introduces a programmable RNA template as an intermediary component that mediates the spatial positioning of antigen binding domains. The RNA template serves as a scaffold that physically positions the binding domains at specific distances and orientations relative to each other, enabling precise control over the spatial arrangement without requiring complex protein engineering of the antibody framework itself.
Solution Approach 2:
The patent utilizes variable parameters including different RNA template lengths, secondary structures, and sequence compositions to adjust the spatial distance and orientation between antigen binding domains. By changing these RNA template parameters, the invention optimizes the geometric arrangement to match the spatial requirements of different target epitopes, thereby improving on-target activity.
2Reliability
If conventional bisspecific antibody formats are used, then the basic structure is formed, but off-target activity increases due to inability to control binding domain orientation
Solution Approach 1:
The programmable RNA template acts as a mediator that controls the orientation and spatial relationship between the two antigen binding domains. This precise positioning ensures that each domain is optimally oriented toward its specific target epitope, reducing the likelihood of off-target binding by ensuring high specificity for the intended targets while minimizing cross-reactivity with unrelated antigens.
Solution Approach 2:
The invention applies different local configurations of the RNA template to control the specific orientation of each antigen binding domain. By locally optimizing the RNA structure at different positions, the patent enables each binding domain to have the precise spatial orientation needed for high-specificity binding to its target, thereby minimizing off-target effects.
3Ease of manufacture
If linker peptides of fixed length are used, then the construction is simplified, but the ability to optimize antigen engagement is limited
Solution Approach 1:
The programmable RNA template serves multiple functions simultaneously: it acts as a structural scaffold, a programmable spacer, an orientation controller, and a designable element. This multi-functionality allows the same basic RNA-based platform to be used across different bispecific antibody constructs with varying spatial requirements, maintaining construction simplicity while enabling precise optimization of antigen engagement through programmable design.
Data Source
AI summary
The present invention relates to novel multispecific antigen binding proteins that are capable of binding to multiple targets. Pharmaceutical compositions comprising the multispecific antigen binding proteins as well as methods for producing them are also disclosed.