Fc Protein A Elution Buffer for Low-Aggregation Antibody Purification
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Solution Overview
Problem
Existing methods for purifying Fc region-containing proteins, such as those using protein A chromatography, lead to protein aggregation due to low pH elution, compromising structural integrity and stability, and temperature-responsive resins are impractical for large-scale manufacturing due to temperature lag times.
Innovation Solution
A method involving elution of Fc region-containing proteins from a temperature-responsive protein A resin using a buffer with a pH of 6.5 to 7.5, comprising a chaotropic agent, sugar alcohol, and amino acids at a temperature below 35°C, allowing for efficient purification and separation from impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional protein A chromatography is used for purification, then high binding capacity is achieved, but protein aggregation occurs due to low pH elution
Solution Approach 1:
The patent changes the pH parameter from conventional low pH (2-3) to neutral pH (6.5-7.5) for elution, and introduces chaotropic agents (urea, guanidinium chloride) and sugar alcohols (sorbitol, mannitol) as new chemical parameters to achieve elution without aggregation, resolving the contradiction between binding capacity and protein stability
Solution Approach 2:
The patent uses a composite elution buffer containing multiple components (chaotropic agent + sugar alcohol + amino acids) working together to maintain protein stability during elution, where the chaotropic agent disrupts protein-protein interactions while the sugar alcohol and amino acids maintain solubility and prevent aggregation
2Stability of the object's composition
If temperature-responsive protein A resin is used to enable neutral pH elution, then protein stability is improved, but significant temperature shift time is required
Solution Approach 1:
The patent extracts the temperature shift requirement from the elution process by using chemical agents (chaotropic agents and sugar alcohols) that enable neutral pH elution at constant temperature, eliminating the time-consuming temperature manipulation step while maintaining protein stability
Solution Approach 2:
The patent introduces chaotropic agents and sugar alcohols as intermediary substances that mediate between the protein A resin and the protein, enabling elution at neutral pH and constant temperature by disrupting interactions without requiring temperature changes
3Productivity
If low pH elution is used to release protein from resin, then elution efficiency is high, but structural integrity of protein is compromised
Solution Approach 1:
The patent changes the pH parameter from low (2-3) to neutral (6.5-7.5) and introduces chaotropic agents and sugar alcohols as new chemical parameters to achieve both high elution efficiency and maintained structural integrity by disrupting protein-resin interactions without denaturing the protein
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
Reduces protein aggregation and simplifies large-scale manufacturing by maintaining neutral pH and consistent temperature, achieving high yields of monomeric proteins and effective separation of antibodies from half antibody forms.
Implementation Method 1
eluting the protein from the material at a temperature from about 1°C to about 25°C with an elution buffer having a pH of about 6.5 to about 7.5 and comprising a chaotropic agent, a sugar alcohol, an apolar amino acid, and a basic amino acid
Implementation Method 2
contacting a solution comprising the protein and one or more impurities with a temperature-responsive protein A material at a temperature at which the protein binds to the material
Data Source
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AI summary
The present invention relates to methods of purifying proteins containing Fc regions, such as antibodies and Fc fusion proteins. In particular, the present invention relates to a purification method resulting in reduced levels of aggregate protein comprising adsorbing an Fc region-containing protein to a temperature-responsive protein A resin and eluting the protein from the resin at a temperature below 35 C with an elution buffer comprising a chaotropic agent, a sugar alcohol, and at least one amino acid. Methods of separating fully assembled antibodies from half antibody forms thereof using the elution buffer are also described.