Protein A Elution pH Gradient Monomer Purity
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Solution Overview
Problem
Current methods for purifying proteins, particularly those with a CH2/CH3 region, face challenges in achieving high purity and efficiency due to aggregation, host cell impurities, and virus filter foulants, requiring multiple chromatography steps and resources, which increase processing time and cost.
Innovation Solution
A method involving binding polypeptides to Protein A and eluting with a pH gradient starting at or below 5.0, using a combination of high and low pH buffers to separate polypeptides from impurities, including aggregates, host cell impurities, and virus-like particles, while achieving high monomer purity and reducing the need for additional purification steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple chromatography techniques are used to separate proteins from impurities, then purification purity is improved, but processing time and cost increase
Solution Approach 1:
The patent combines multiple separation mechanisms (affinity binding to Fc region, charge-based ion exchange, and hydrophobic interaction) into a single integrated Protein A resin system. This allows simultaneous removal of different impurity types (aggregates, host cell proteins, viruses) in one pass, eliminating the need for sequential chromatography steps and reducing processing time while maintaining high purity
Solution Approach 2:
The Protein A resin is designed to perform multiple purification functions simultaneously: it captures target proteins via Fc region affinity, separates aggregates through size exclusion properties, removes host cell impurities via charge interactions, and eliminates viruses through hydrophobic interactions. This multi-functional approach replaces multiple specialized chromatography steps with a single versatile resin
2Manufacturing precision
If multiple chromatography resins and sorbents are used for further purification, then separation accuracy is improved, but resource consumption and cost increase
Solution Approach 1:
The patent integrates the functions of multiple different chromatography resins (affinity resin, ion exchange resin, hydrophobic interaction resin) into a single Protein A resin formulation. This consolidation reduces resource consumption by eliminating the need to purchase, store, and dispose of multiple separate resin types while maintaining the separation accuracy of each individual method
3Manufacturing precision
If additional purification steps are performed to remove impurities, then product purity is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple purification steps (affinity chromatography, ion exchange, hydrophobic interaction chromatography) into a single integrated process using Protein A resin. This reduces device complexity by eliminating multiple column connections, buffer exchanges, and process controls while achieving the same purity outcomes through the resin's multi-functional properties
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 achieves better separation of polypeptide monomers from impurities, resulting in higher purity and reduced processing time and costs, with the ability to be scaled for commercial processes and integrated with alternative downstream technologies.
Implementation Method 1
Protein A is a 41 kD cell wall protein from Staphylococcus aureas which binds with a high affinity (about 10−8 M to human IgG) to the Fc region of antibodies
Implementation Method 2
eluting with a pH gradient starting at or below 5.0
Data Source
AI summary
The present invention provides methods for purifying a polypeptide comprising a CH2/CH3 region, comprising binding the polypeptide to Protein A and eluting with a pH gradient starting at a low pH.