Anion Exchange Chromatography for Divalent Cation Binding Protein Purification
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Solution Overview
Problem
Current methods for purifying divalent cation binding proteins, such as Factor VII and Factor IX, often result in low yields and impurities, making it challenging to achieve high purity and biological activity suitable for pharmaceutical applications.
Innovation Solution
A two-step method involving loading an anion exchange resin with the protein in the absence of divalent cations, eluting with a counter-anion, supplementing the eluate with divalent cations, and increasing the pH to enhance purification on a second resin, allowing for high-yield and high-purity recovery of divalent cation binding proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ion exchange chromatography is used to purify divalent cation binding proteins, then the proteins can be separated from culture medium, but the purification yield is low and impurities remain
Solution Approach 1:
The purification process is divided into two distinct steps: (1) loading the protein onto anion exchange resin in the absence of divalent cations to achieve high purity, and (2) eluting with divalent cations to achieve high yield. This segmentation allows each step to optimize for its specific goal without compromise.
Solution Approach 2:
The method performs preliminary removal of divalent cations from the protein solution before chromatography. This preliminary action prevents divalent cations from interfering with the anion exchange process, enabling the protein to bind effectively to the resin for high purity separation.
2Reliability
If divalent cations are present during anion exchange chromatography, then protein binding to resin is enhanced, but elution efficiency decreases
Solution Approach 1:
The method employs periodic action by first conducting chromatography in the absence of divalent cations (binding phase), then periodically introducing divalent cations during elution (elution phase). This temporal separation optimizes both binding and elution efficiency at different stages.
Solution Approach 2:
The method changes the parameter of divalent cation concentration from zero during loading to elevated levels during elution. This parameter change enables the system to achieve strong binding during loading and efficient elution during the elution phase, resolving the contradiction between binding and elution efficiency.
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 method significantly reduces process-related impurities and achieves high purity (>99%) and specific activity of divalent cation binding proteins, improving their suitability for pharmaceutical use.
Implementation Method 1
purification of a divalent cation binding protein by anion exchange chromatography comprising the steps of (a) loading a first anion exchange resin material with the divalent cation binding protein in a loading buffer in the absence of divalent cations
Implementation Method 2
eluting the divalent cation binding protein with an eluant comprising a counter-anion to form an eluate containing the divalent cation binding protein
Data Source
AI summary
The present invention relates to a two-step method for the purification of divalent cation binding proteins with high yield and high purity on anion exchange resin materials, to divalent cation binding proteins obtainable by said method, and to a kit comprising means for carrying out said method.