Antibody-Enzyme Stability via Light Chain Proline Modification
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Solution Overview
Problem
Current methods for producing antibody-enzymes result in unstable enzyme activity and varying performance between batches, making it challenging to achieve sufficient enzyme activity for clinical use.
Innovation Solution
A method involving the modification of the 95th proline residue in the variable region of κ light chain antibodies, either by deletion or substitution, and the use of metal ions followed by purification, to enhance enzyme activity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gene recombination techniques are used to produce antibody-enzymes, then production can be achieved, but enzyme activity is insufficient and performance varies greatly between batches
Solution Approach 1:
The invention changes the amino acid sequence parameter of the antibody light chain by deleting or substituting the 95th proline residue from the N-terminal of the variable region. This parameter change in the primary structure leads to improved enzyme activity and enhanced batch-to-batch consistency without requiring changes to the overall production methodology
Solution Approach 2:
The invention applies local quality modification by targeting a specific position (95th residue) within the variable region of the light chain rather than modifying the entire antibody structure. This localized change at the N-terminal portion of the variable region achieves the desired improvement in enzyme activity while maintaining the overall antibody framework
2Manufacturing precision
If metal ions are added during production, then enzyme activity is enhanced, but additional purification steps are required
Solution Approach 1:
The invention performs preliminary action by incorporating the metal ion binding capability directly into the antibody light chain structure through the modified 95th residue. This pre-built-in feature allows metal ions to be incorporated during the expression process itself, before the purification steps, thereby enhancing enzyme activity without requiring complex post-production metal ion addition procedures
Solution Approach 2:
The modified antibody light chain serves itself by having an intrinsic ability to bind metal ions through the modified 95th residue. This self-service capability means the antibody automatically acquires its metal ion cofactor during expression and purification, eliminating the need for separate metal ion addition steps and reducing overall process complexity
Data Source
AI summary
A method for producing a κ light chain antibody having enzyme activity or improved enzyme activity includes modifying a polynucleotide that encodes a κ light chain antibody having a polypeptide having an amino acid sequence where the 95th amino acid residue from the N-terminal of a variable region by the Kabat classification is a proline residue, to delete or substitute the proline residue and to obtain a polynucleotide that encodes a κ light chain antibody having a polypeptide having an amino acid sequence where the 95th amino acid residue from the N-terminal of a variable region by the Kabat classification is deleted or substituted with an amino acid residue other than a proline residue, and expressing a κ light chain antibody having enzyme activity in an intracellular or extracellular expression system by using an expression vector including the polynucleotide that encodes a κ light chain antibody obtained after modification.