Recombinant Protein Purification with Additives to Suppress Polymerization
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Solution Overview
Problem
Existing purification methods for recombinant human albumin, particularly those using yeast expression systems, face challenges in achieving ultra-high purity due to high polymer production, interaction of host proteins and pigments, and inefficiencies in chromatographic processes, leading to immunogenicity and low yield.
Innovation Solution
The method involves adding aminoguanidine and medium-long chain fatty acids to the sample containing recombinant protein, followed by cation exchange and hydrophobic chromatography, using specific chromatographic media to inhibit polymerization and interactions, thereby enhancing purification efficiency and reducing contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification media are used, then the purification process can be performed, but the purity of recombinant human albumin cannot reach ultra-high level due to polymer formation and host protein interactions
Solution Approach 1:
The patent introduces specific additives as intermediaries between the recombinant human albumin and the purification media. These additives mediate the interaction by preventing harmful polymer formation and host protein binding, allowing the target protein to be purified without forming harmful aggregates or interacting with contaminants.
Solution Approach 2:
The patent modifies the chemical parameters of the purification system by adding specific compounds that change the physicochemical environment. This prevents polymerization reactions and alters protein-protein interaction parameters, thereby eliminating harmful effects while maintaining purification capability.
2Object-generated harmful factors
If heat treatment is applied to inactivate proteases, then protease activity is reduced, but heat shock proteins cross-link with recombinant human albumin making subsequent chromatographic purification difficult
Solution Approach 1:
The patent applies preliminary protection action by adding specific compounds before heat treatment. These compounds prevent the formation of cross-linked complexes between heat shock proteins and recombinant human albumin, so that when heat treatment is applied to inactivate proteases, the target protein remains available for subsequent chromatographic purification.
3Manufacturing precision
If multiple chromatographic steps are used to remove contaminants, then purification efficiency improves, but the process becomes complex and yield decreases
Solution Approach 1:
The patent combines multiple purification functions into a single chromatographic step by using specially modified media that can simultaneously remove host proteins, pigments, and prevent polymer formation. This merging of functions reduces the number of sequential steps needed while maintaining high purity and yield.
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 significantly reduces polymers, host proteins, and pigments, improving the purity and yield of recombinant human albumin by exposing more hydrophobic regions for thorough removal, thus facilitating high-purity recombinant protein production.
Implementation Method 1
adding aminoguanidine and a medium-long chain fatty acid to a sample containing the recombinant protein... to inhibit polymerization and interactions
Implementation Method 2
chromatographing the obtained sample... cation exchange and hydrophobic chromatography
Implementation Method 3
chromatographing the obtained sample... cation exchange and hydrophobic chromatography, using specific chromatographic media to inhibit polymerization and interactions
Data Source
AI summary
The present invention provides a method for purification of a recombinant protein, in particular to a recombinant human albumin; the method includes: (a) adding aminoguanidine and a medium-long chain fatty acid to a sample containing the recombinant protein; and (b) chromatographing the obtained sample, where the chromatography is optionally performed with a chromatographic buffer solution containing aminoguanidine.