Antibody Production Yield via Polyanionic Culture Medium
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Solution Overview
Problem
Current methods for producing antibodies using animal cells in protein expression systems face challenges in increasing yield without escalating production costs, particularly when modifying the antibody's framework region to enhance antigen affinity.
Innovation Solution
Culturing animal cells in the presence of polyanionic compounds, such as anionic polysaccharides and polyamino acids, to enhance antibody production, specifically by substituting amino acid residues in the framework region 3 with arginine or lysine residues, thereby improving antibody yield without the need for large-scale cell culture expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scale of cell culture is expanded to increase antibody yield, then the yield of antibody increases, but the production cost becomes high
Solution Approach 1:
The invention changes the chemical composition parameter of the culture medium by adding polyanionic compounds (such as heparin, dextran sulfate, or polyaspartic acid) to enhance antibody production. This allows achieving high antibody yield without expanding culture scale, thereby avoiding increased production costs associated with large-scale culture operations
Solution Approach 2:
Polyanionic compounds act as intermediary substances that mediate between the cell culture system and antibody production. These compounds interact with the culture medium to create an environment that enhances antibody secretion and stability, enabling high yield at smaller culture scales
2Reliability
If at least 3 amino acid residues of FR3 are substituted with arginine residues or lysine residues to control affinity, then the antigen affinity is improved, but the production yield is insufficient
Solution Approach 1:
The invention changes the physical-chemical parameter of the culture environment by introducing polyanionic compounds that interact with the modified antibody (with substituted FR3 residues). This interaction stabilizes the modified antibody structure and enhances its secretion, thereby improving production yield without compromising the affinity-enhancing amino acid substitutions
Solution Approach 2:
The invention creates a composite culture system combining the genetically modified antibody (with FR3 substitutions for enhanced affinity) and polyanionic compounds. This composite approach allows simultaneous achievement of high antigen affinity through amino acid substitution and high production yield through the synergistic effect of polyanionic compounds
Data Source
AI summary
Disclosed is a method for producing an antibody, comprising culturing in a presence of a polyanionic compound an animal cell into which a gene encoding an antibody has been introduced whereby the animal cell produces the antibody, wherein the polyanionic compound is at least one selected from the group consisting of an anionic polysaccharide and an anionic polyamino acid, and the antibody is an antibody in which at least 3 amino acid residues of framework region 3 (FR3) are substituted each independently with an arginine residue or a lysine residue.