Multispecific Binding Protein Purification via Affinity Tag
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Solution Overview
Problem
The development of multispecific binding proteins, such as bispecific antibodies, is hindered by the complexity of assembly, manufacturing, and purification, leading to reduced yields and increased costs due to the formation of undesired molecules and impaired effector functions, immunogenicity concerns, and altered pharmacokinetic properties.
Innovation Solution
The development of multispecific binding proteins with specific amino acid residues in their antigen binding domains, such as kappa light chain Fab regions with lysine and aspartic acid modifications, which enhance purification efficiency, stability, and reduce immunogenicity risk, while maintaining affinity and assembly, using affinity chromatography for purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional recombinant expression methods are used to produce multispecific binding proteins, then the proteins can be manufactured, but a mixture including undesired molecules (monospecific proteins, single chain pairs) is expressed requiring additional purification steps
Solution Approach 1:
The patent introduces a purification tag sequence at the N-terminus of the light chain constant region before recombinant expression. This preliminary action enables selective purification of the desired multisspecific binding protein from the expression mixture, preventing the yield reduction that would otherwise result from complex purification requirements.
Solution Approach 2:
The purification tag acts as an intermediary element that facilitates the separation of desired multisspecific binding proteins from undesired molecules. The tag provides a specific binding site that allows purification reagents to selectively capture the target protein, simplifying the purification process and increasing yield.
2Manufacturing precision
If additional purification steps are implemented to remove undesired molecules, then purification efficiency improves, but the overall manufacturing cost increases
Solution Approach 1:
By incorporating the purification tag during the recombinant expression step, the patent prepares the protein for efficient purification in advance. This preliminary action reduces the need for multiple complex purification steps, thereby lowering manufacturing costs while maintaining high purification efficiency.
Solution Approach 2:
The introduction of the purification tag changes the physical-chemical parameters of the protein molecule, adding a specific sequence that provides selective binding properties. This parameter change enables a single effective purification step using affinity chromatography, reducing both time and cost compared to traditional multi-step purification protocols.
3Manufacturing precision
If purification tags or other modifications are added to enhance purification, then purification efficiency improves, but the time and cost of the purification process increase
Solution Approach 1:
The purification tag is incorporated during the protein expression step, preparing the molecule for rapid purification before the purification process begins. This preliminary preparation enables a single-step affinity purification, saving time compared to traditional multi-step methods that would require sequential processing.
Solution Approach 2:
The patent replaces complex mechanical purification procedures with a biochemical affinity-based system. The purification tag provides specific molecular recognition that allows rapid separation using affinity chromatography, reducing the time required compared to traditional mechanical separation methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach results in improved purification yields, reduced protein aggregation, and preserved affinity and stability of multispecific binding proteins, without increasing the time or cost of the purification process, and minimizes the risk of immunogenicity and altered pharmacokinetic properties.
Implementation Method 1
using affinity chromatography for purification
Data Source
AI summary
Multispecific binding proteins that bind a first antigen and a second antigen and methods of purifying multispecific binding proteins.