Protein L Conductivity Elution for Bispecific Antibody Purification
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Solution Overview
Problem
Existing methods for purifying bispecific antibodies face challenges in efficiently separating different antibodies due to mismatched heavy and light chains, leading to a mixture of ten types of antibodies, and there is a need for improved methods to isolate desired bispecific antibodies while removing mismatched VH and VL pairs.
Innovation Solution
The method involves eluting proteins from a Protein L matrix by lowering conductivity, utilizing the difference in the number of Protein L binding motifs, such as antibody kappa chain variable regions, to separate proteins with one, two, or no binding motifs, using a Protein L matrix at specific conductivities and pH levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional Protein L purification methods are used, then antibody purification is achieved, but proteins with different numbers of binding motifs cannot be effectively separated
Solution Approach 1:
The patent applies parameter changes by utilizing conductivity as a variable parameter to differentiate and separate proteins based on their binding motif counts. By adjusting conductivity levels during elution, the system achieves selective release of proteins with different numbers of Protein L binding motifs, enabling precise separation that conventional methods cannot achieve.
2Productivity
If bispecific antibodies are produced by co-expressing four components, then bispecific antibody production is achieved, but a mixture of ten antibody types is produced due to mismatched combinations
Solution Approach 1:
The patent extracts and removes unwanted antibody types from the mixture by exploiting differences in their binding motif compositions. Proteins with mismatched VH-VL pairs or incorrect light chain types are selectively eluted and removed, leaving only the desired bispecific antibody, thus achieving high specificity from a complex mixture.
3Reliability
If Protein L matrix is used for antibody purification, then kappa light chain binding is achieved, but mismatched VH and VL pairs cannot be efficiently removed
Solution Approach 1:
The patent employs feedback mechanisms through conductivity monitoring during the purification process. By monitoring and adjusting conductivity levels, the system provides feedback control to selectively elute proteins based on their binding affinity characteristics, enabling efficient removal of mismatched pairs while maintaining reliable kappa light chain binding.
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
This approach allows for the efficient separation and purification of monovalent and bivalent antibodies, increasing purity and enabling the production of high-purity bispecific antibodies by effectively isolating proteins with distinct binding affinities to Protein L.
Implementation Method 1
contacting a solution comprising at least two different proteins with a Protein L matrix at a certain conductivity so that the proteins are bound to the Protein L matrix
Implementation Method 2
eluting the bound proteins from the Protein L matrix by lowering the conductivity, wherein each of the proteins comprises a different number of Protein L binding motifs
Data Source
AI summary
The invention provides methods of purifying and/or producing a protein. In some embodiments, a method of the present invention comprises the step of eluting a protein from a Protein L matrix by lowering a conductivity. In some embodiments, the protein is an antibody. The invention also provides an antibody. In some embodiments, an antibody of the present invention comprises a light chain, which comprises a kappa variable region and a lambda constant