Antibody Elbow Region Insertion for Multispecific Binding
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Solution Overview
Problem
Existing antibody formats face challenges in achieving optimal binding capacity, stability, and production yields, particularly in multispecific IgG formats, where additional binding sites are often appended to the termini or created through complex molecular engineering.
Innovation Solution
The development of a novel antibody format where an additional functional domain is inserted into the elbow region of the antibody, allowing for simultaneous binding to an antigen and an additional target through an independent binding site, without requiring fragments of the second polypeptide chain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional binding sites are appended to the termini of classical IgG antibodies to create multispecific formats, then the antibody can bind to multiple distinct targets, but the structural complexity and molecular engineering requirements increase significantly
Solution Approach 1:
The invention divides the antibody structure into functional segments by inserting a functional domain specifically into the elbow region, separating this modification from the variable and constant domains. This segmentation allows the elbow region to independently provide an additional binding site without requiring complex engineering of the entire antibody molecule, thereby achieving multispecificity with reduced overall complexity
Solution Approach 2:
Instead of appending binding sites only to the N- or C-termini of the antibody (one-dimensional approach), the invention utilizes the elbow region as a new spatial dimension for inserting functional domains. This two-dimensional approach to modifying antibody structure enables additional binding sites to be incorporated without extending the linear length of the molecule, thereby reducing structural complexity while maintaining multispecific capability
2Adaptability or versatility
If complex molecular engineering is used to create multispecific IgG formats, then additional binding sites can be achieved, but production yields and antibody stability are compromised
Solution Approach 1:
The elbow region naturally provides flexibility and structural support in classical antibodies. By inserting a functional domain into this self-service region, the antibody utilizes its own inherent structural properties to accommodate the additional binding site without requiring external stabilization mechanisms or complex engineering interventions, thereby maintaining stability and production yield
Solution Approach 2:
The elbow region, which naturally provides flexibility for antigen binding, is repurposed to also accommodate additional functional domains. This multi-functional use of the elbow region allows it to simultaneously maintain its native role in enabling variable domain movement while also providing a platform for additional binding sites, thereby achieving versatility without compromising stability
3Productivity
If additional functional domains are inserted into the elbow region, then binding capacity and stability are enhanced, but the structural configuration becomes more complex
Solution Approach 1:
The invention applies local quality modification by inserting the functional domain specifically into the elbow region rather than uniformly modifying the entire antibody structure. This localized approach enhances binding capacity at the elbow region while leaving the variable and constant domains unchanged, thereby improving productivity without requiring complex reconfiguration of the entire molecular structure
Data Source
AI summary
The present invention provides engineered antibodies and antigen binding fragments, in which an additional functional domain is inserted into the elbow region of the antibody or antigen binding fragment. The present invention also provides nucleic acid molecules, such as vectors, encoding such antibodies and antigen binding fragments, host cells and compositions comprising such antibodies, antigen binding fragments or nucleic acid molecules and uses thereof. For example a multispecific antibody format is provided, in which an additional binding site (specificity) is inserted into the elbow region of an antibody or antigen binding fragment.