Peptoid Affinity Ligands for Antibody Purification
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Solution Overview
Problem
Current methods for isolating and purifying monoclonal antibodies and Fc-fusion proteins are costly due to the use of Protein A or Protein G affinity chromatography, which are chemically unstable and prone to proteolytic degradation, leading to high costs and potential contamination.
Innovation Solution
Development of peptoid affinity ligands that are resistant to proteolysis and offer high affinity and selectivity for antibodies, allowing for efficient purification and potential reuse, with specific peptoid compounds designed to bind to antibodies and Fc-fusion proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Protein A or Protein G affinity chromatography is used for antibody purification, then high selectivity and binding affinity are achieved, but the cost increases significantly and chemical stability decreases
Solution Approach 1:
The patent creates peptoid copies that mimic the binding interface of Protein A/G but with simplified chemistry. These peptoid ligands replicate the essential binding functionality while eliminating the complex protein structure, resulting in lower cost and improved stability without sacrificing binding affinity to antibodies
Solution Approach 2:
The patent changes the chemical parameters of the ligand from protein-based to peptoid-based, fundamentally altering the material composition. This parameter change transforms the ligand into a chemically stable, protease-resistant material that maintains antibody binding capability while resisting degradation and reducing cost
2Reliability
If Protein A or Protein G affinity chromatography is used for antibody purification, then high selectivity is achieved, but chemical stability and resistance to proteolysis deteriorate
Solution Approach 1:
The peptoid ligands copy only the essential binding moieties needed for antibody recognition, eliminating the vulnerable protein regions that are susceptible to proteolysis. This selective copying preserves selectivity while removing chemical instability
Solution Approach 2:
The patent creates composite peptoid structures that combine aromatic residues for hydrophobic interactions with charged residues for electrostatic interactions, mimicking the multifaceted binding interface of Protein A/G. This composite approach maintains high selectivity through multiple interaction types while the peptoid backbone provides protease resistance
3Productivity
If Protein A or Protein G affinity chromatography is used for antibody purification, then effective capture is achieved, but column lifetime decreases due to ligand degradation
Solution Approach 1:
The patent develops peptoid ligands that are inherently stable and resistant to degradation, replacing the disposable nature of protein ligands. While protein ligands require frequent replacement due to degradation, peptoid ligands maintain their structure and binding capability over extended periods, effectively making the column reusable and extending operational lifetime
Solution Approach 2:
The patent converts the inherent vulnerability of protein ligands to proteolysis into an advantage by using peptoid chemistry that is naturally resistant to enzymatic degradation. This chemical transformation turns potential harm (degradation) into benefit (stability), allowing columns to withstand repeated use and harsh cleaning conditions
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
Peptoid affinity ligands provide a cost-effective and stable solution for antibody purification, offering high binding affinity and resistance to proteolysis, enabling multiple purification cycles and reducing the risk of contamination.
Implementation Method 1
peptoid affinity ligands comprising a peptoid compound consisting of sequentially coupled peptoid residues forming a peptoid backbone, with one or more functional groups appended to a Nitrogen of the peptoid residues
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
Disclosed herein are peptoids and related compounds, including peptoid affinity ligands, and hybrid peptoids, for binding and/or purifying immunoglobulins, immunoglobulin fragments or immunoglobulin fusion proteins thereof. Methods of making peptoid affinity ligands and using the same to bind, purify and/or isolate immunoglobulins and related compounds are also disclosed. Such peptoid affinity ligands comprise a peptoid compound consisting of sequentially coupled peptoid residues forming a peptoid backbone, with one or more functional groups appended to a Nitrogen of the peptoid residues of the peptoid backbone configured to provide the desired binding affinity. The peptoids can further comprise a peptoid backbone with at least one functional group coupled to an alpha carbon (C) of a peptide bond in the peptoid backbone thereby forming a hybrid peptoid.