Dual Affinity Polypeptide Purification Process
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Solution Overview
Problem
Conventional affinity chromatography is costly and limited by the need for multiple column reuse, leading to extended production processes and capacity loss, with high costs and risks of contamination, and requires complex regeneration procedures and harsh cleaning protocols, which are time-consuming and costly.
Innovation Solution
A dual affinity polypeptide process that uses a semi-generic dual affinity polypeptide with different binding affinities for the target biomolecule and the capturing ligand, allowing for non-covalent binding to a generic affinity matrix, enabling efficient recovery of the target biomolecule by elution while leaving the dual affinity polypeptide attached to the ligand, thus preventing leakage and simplifying the purification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional affinity chromatography uses immobilized ligands on solid phase matrices with reversible binding, then target molecules can be recovered by dissociation at eluting conditions, but the dissociation constant between ligand and target protein is limited to about 10^-5 M, restricting binding strength
Solution Approach 1:
The invention divides the binding system into three components: the solid phase matrix, the ligand, and the dual affinity polypeptide. The dual affinity polypeptide acts as an intermediary that segments the direct ligand-target interaction into two separate interactions: ligand-DAP and DAP-target binding. This segmentation allows each interaction to be optimized independently, with the ligand-DAP bond being stronger than traditional ligand-target bonds.
Solution Approach 2:
The dual affinity polypeptide serves as an intermediary molecule between the ligand and the target biomolecule. It contains two different binding sites: one that binds to the ligand with high affinity (lower Kd) and another that binds to the target biomolecule. This intermediary approach enables stronger overall binding while maintaining reversible elution capabilities.
2Ease of manufacture
If affinity columns are reused multiple times to reduce costs, then manufacturing cost decreases, but production process time extends and capacity loss increases
Solution Approach 1:
The invention employs a disposable solid phase matrix containing the ligand that is used for a single purification cycle and then discarded. This eliminates the need for time-consuming regeneration and cleaning protocols required for column reuse, thereby maintaining high productivity while reducing costs associated with column maintenance and validation.
3Ease of manufacture
If affinity columns are reused requiring regeneration procedures, then cost per batch decreases, but complex regeneration and harsh cleaning protocols increase time consumption and contamination risk
Solution Approach 1:
The solid phase matrix is designed as a single-use component that eliminates regeneration requirements. The low cost of the disposable matrix allows the system to forgo expensive and time-consuming regeneration protocols, thereby reducing both time loss and contamination risk while maintaining cost-effectiveness.
Solution Approach 2:
Instead of reusing the expensive ligand-bound matrix and regenerating it, the invention inverts the approach by using a cheap disposable matrix and recovering the valuable target biomolecule in high purity. The value is placed on the purified product rather than the reusable column.
4Ease of operation
If conventional affinity chromatography uses ligands covalently attached to matrices, then the system is ready to use immediately, but the ligand-target dissociation requires harsh conditions that may damage biomolecules
Solution Approach 1:
The dual affinity polypeptide acts as a protective intermediary that allows mild elution conditions. The ligand binds to the DAP with high affinity, and the DAP binds to the target biomolecule, creating a buffered interaction system. This intermediary structure enables elution under gentle conditions that preserve biomolecule integrity while still achieving effective separation.
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 costs, simplifies downstream processing, and eliminates the need for complex regeneration and cleaning protocols, allowing for more flexible elution conditions and reducing the risk of contamination, while maintaining high purity and efficiency in target biomolecule recovery.
Implementation Method 1
A dual affinity polypeptide process that uses a semi-generic dual affinity polypeptide with different binding affinities for the target biomolecule and the capturing ligand, allowing for non-covalent binding to a generic affinity matrix
Implementation Method 2
contacting (i) a target biomolecule, (ii) a dual affinity polypeptide, and (iii) a solid support comprising a catching ligand
Data Source
AI summary
The present invention relates to a process for purification of a target biomolecule, comprising the steps: (a) contacting (i) a target biomolecule, (ii) a dual affinity polypeptide, and (iii) a solid support comprising a catching ligand, wherein the ratio between the equilibrium dissociation constants of the dual affinity polypeptide, [KD, t / KD, s ], is at least 10° at standard conditions; and (b) recovering the target biomolecule by elution.