Mixed Mode Ligands for Protein Purification Yield
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Solution Overview
Problem
Current protein purification methods face challenges such as low yield, costly separation media, and concerns regarding the safe disposal of extraneous materials, particularly in the extraction of immunoglobulins and other proteins from mammalian bodily fluids or cell cultures.
Innovation Solution
A method involving a solid support linked to specific ligands, such as those described in Formulas I and II, which bind target proteins through hydrophobic and anionic moieties, allowing for effective purification via mixed-mode chromatography, with optimized pH and salt conditions for binding and elution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional purification methods are used, then protein purification can be achieved, but the yield is low and costs are high
Solution Approach 1:
The patent employs mixed-mode ligands that combine multiple functional groups (hydrophobic, anionic, and cationic moieties) into a single chromatography medium. This composite approach allows simultaneous exploitation of multiple binding mechanisms, enhancing protein capture efficiency and yield while reducing the quantity of separation media required compared to conventional single-mode systems.
Solution Approach 2:
The invention utilizes pH-dependent binding and elution parameters to control protein interaction with the ligand. By optimizing pH conditions during binding and elution steps, the method achieves high purification yield with improved efficiency, reducing the need for excessive separation media while maintaining high protein recovery.
2Ease of manufacture
If conventional separation media are used, then protein extraction can be performed, but costly materials are consumed and environmental safety is compromised
Solution Approach 1:
The patent employs organic ligands coupled to solid supports that can be used in disposable cartridges or columns. This approach eliminates the need for expensive, reusable materials while maintaining high extraction efficiency. The disposable nature of the medium addresses environmental safety by simplifying disposal procedures and reducing contamination risks, making the process more environmentally friendly despite single-use consumption.
Solution Approach 2:
The mixed-mode ligands are designed to automatically differentiate between target proteins and contaminants through their multiple functional groups. The hydrophobic, anionic, and cationic moieties work synergistically to selectively bind target proteins while allowing contaminants to pass through, achieving high purification efficiency without requiring additional costly separation steps or materials.
3Ease of operation
If simple ligands are used, then the system is easier to operate, but purification effectiveness is reduced
Solution Approach 1:
The mixed-mode ligands integrate multiple functional groups (hydrophobic, anionic, and cationic moieties) into a single chromatography medium. This composite approach allows simultaneous exploitation of multiple binding mechanisms, enhancing protein capture efficiency and yield while reducing the quantity of separation media required compared to conventional single-mode systems.
Solution Approach 2:
The invention utilizes pH-dependent binding and elution parameters to control protein interaction with the ligand. By optimizing pH conditions during binding and elution steps, the method achieves high purification yield with improved efficiency, reducing the need for excessive separation media while maintaining high protein recovery.
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 enhances protein purification yield and reduces costs by using a more efficient and environmentally friendly method, minimizing the use of costly separation media and improving the safety of the extraction process.
Implementation Method 1
binding the target protein to the ligand... wherein the ligand is: wherein n is 0, 1, or 2; m is 1, 2, 3, or 4; X is selected from S, C(O)-NH, NH-C(O), C(O)-NH-CH2-C(O)-NH, or SO2
Implementation Method 2
binding the target protein to the ligand... wherein the ligand is: wherein n is 0, 1, or 2; m is 1, 2, 3, or 4; X is selected from S, C(O)-NH, NH-C(O), C(O)-NH-CH2-C(O)-NH, or SO2
Implementation Method 3
the solid support has pores of a median diameter of 0.5 μm or greater, optionally with substantially no pores of 0.1 μm or less in diameter
Implementation Method 4
the contacting is performed at a pH of 4.0 to 6.0 and eluting is performed at a pH of from 6.1 to 8.5
Implementation Method 5
the source solution contains a salt selected from alkali metal and alkaline earth metal halides at a concentration of from 50 mM to 300 mM
Data Source
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AI summary
Mixed mode ligands, as well their use for purifying proteins, are provided.