Reversible Group Exchange for Oligonucleotide Purification
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Solution Overview
Problem
Current methods for protein purification using immobilized metal ion affinity chromatography (IMAC) are limited to polypeptides with specific motifs, and there is a need for methods to attach purification tags to other classes of molecules, such as oligonucleotides, for efficient purification and handling.
Innovation Solution
The development of methods that utilize reversible chemical steps to exchange one group on a molecule with a functional group, such as a purification tag, allowing for the modification of molecules like polypeptides and oligonucleotides to facilitate IMAC purification. This includes the use of exchange reagents like His-HyNic and biotin-HyNic to attach polyhistidine and biotin tags to oligonucleotides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IMAC chromatography is used for protein purification, then polypeptides with specific motifs can be selectively purified, but the method cannot be applied to other classes of molecules like oligonucleotides
Solution Approach 1:
The patent applies universality by developing a broadly applicable chemistry that enables IMAC-based purification across multiple molecule classes (polypeptides, oligonucleotides, lipids, carbohydrates). The method uses reversible group exchange to attach purification tags to diverse molecules, allowing the same chromatography platform to handle different molecular types through a unified approach.
Solution Approach 2:
The patent introduces purification tags (such as polyhistidine, biotin, or other affinity groups) as intermediary elements that mediate between the molecule of interest and the IMAC surface. These tags serve as the actual binding interface with the chromatography matrix, enabling indirect purification of the target molecule through its attached tag.
2Manufacturing precision
If purification tags are attached to molecules for IMAC purification, then selective binding and purification can be achieved, but the tags must be later removed to obtain the purified molecule
Solution Approach 1:
The patent employs dynamic, reversible bonding chemistry that allows the purification tag to be easily attached and removed. The reversible group exchange reactions enable the tag to serve its purification function during chromatography, then be cleanly removed afterward, providing a dynamic system that adapts to different purification needs.
Solution Approach 2:
The method accepts that the purification tag will be discarded after serving its purpose during chromatography. The reversible chemistry enables clean removal of the tag from the purified molecule, allowing the tag to be discarded while recovering the purified molecule in high yield and purity.
3Productivity
If multiple molecules are synthesized as a pool and purified in parallel, then productivity increases, but existing IMAC methods cannot handle such pools efficiently
Solution Approach 1:
The patent enables parallel purification of multiple molecules in a single IMAC run by using universal purification tags that can be attached to different molecule types. This allows diverse molecules in a pool to be purified simultaneously using the same chromatography system, dramatically increasing throughput without requiring separate purification protocols for each molecule type.
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
These methods enable the efficient purification of molecules by allowing specific tags to be attached and later removed, thereby overcoming the limitations of existing IMAC methods and providing a broadly applicable chemistry for molecule modification and purification.
Implementation Method 1
methods for modifying molecules of interest by exchange of one group of the molecule with a different, functionally useful group, using one or more reversible chemical steps
Implementation Method 2
the amino acids of the motif can form coordinate bonds around metal ions, such as Ni2+ or Co2+, that are present on an IMAC chromatography surface
Data Source
AI summary
Embodiments of the present disclosure include methods and compositions for functionalizing molecules, such as oligonucleotides, with functional groups, including polyhistidine tags useful in affinity methods. Some embodiments include methods for modifying and purifying complex mixtures of molecules by exchange of functional tags.