Charged Tail Immobilization for Protein Multimer Conformation
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Solution Overview
Problem
Current methods for immobilizing proteins, especially heterodimers, face challenges in retaining full protein conformation and biological activity, with nonspecific protein adsorption also being a concern, which affects detection performance.
Innovation Solution
The use of charged tails to immobilize multimers on a surface while allowing monomeric protein units to interact, with the charged tails interacting with each other, utilizing chimeric polypeptides covalently associated with silane linker moieties on a surface with hydroxyl groups, maintaining the active conformation of the multimers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If proteins are immobilized onto surfaces using conventional methods, then convenience of use and reusability are improved, but protein conformation and biological activity are lost
Solution Approach 1:
The patent introduces charged amino acid tails (acidic or basic) as intermediary elements that mediate between the protein and the surface. These tails form salt bridges with oppositely charged groups on the surface, allowing immobilization without direct contact between the surface and the protein's active regions, thus preserving conformation and activity while enabling reuse
Solution Approach 2:
The invention modifies only specific local regions of the protein by adding charged amino acid tails to the N- or C-terminus, while leaving the rest of the protein structure unchanged. This localized modification enables surface interaction without affecting the global conformation and biological function of the protein
2Stability of the object's composition
If proteins are immobilized onto surfaces, then stability is improved, but protein conformation is altered
Solution Approach 1:
Charged amino acid tails serve as flexible intermediaries that connect the protein to the surface through salt bridges. These tails absorb the mechanical stress of immobilization and can adjust their conformation, preventing transmission of destabilizing forces to the protein's active structure while maintaining overall stability
3Duration of action of stationary object
If proteins are immobilized onto surfaces, then reusability is improved, but nonspecific protein adsorption increases
Solution Approach 1:
The invention creates highly specific local interaction sites using charged amino acid tails that form electrostatic salt bridges with oppositely charged surface groups. This specific electrostatic interaction selectively binds the modified protein while repelling or excluding other proteins, thereby reducing nonspecific adsorption and enabling reusable applications
Solution Approach 2:
The patent converts the typically problematic nonspecific adsorption issue into a beneficial specific electrostatic interaction. By using charged tails that form salt bridges, the system achieves high-specificity binding that prevents nonspecific adsorption of other proteins, turning a potential harm into a benefit for reusability
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 effectively maintains the biological activity and conformation of immobilized multimers, reducing nonspecific adsorption and enhancing detection performance by allowing specific interactions between monomeric units.
Implementation Method 1
The carboxyl group of the first chimeric polypeptide is covalently associated to a first silane linker (FSL) moiety, wherein the FSL is covalently associated with a first hydroxyl group of the surface
Implementation Method 2
The carboxyl group of the second chimeric polypeptide is covalently associated to a second silane linker (SSL) moiety, wherein the SSL is covalently associated with a second hydroxyl group of the surface
Implementation Method 3
The AAT is non-covalently associated with the BAT
Implementation Method 4
The charged tails also interact with one another
Data Source
AI summary
Surfaces and processes are provided for immobilization of multimer polypeptides that preserves the functionality and active conformation of the native multimeric polypeptides. The multimer polypeptide is a self-assembled multimer and comprises both a first and a second chimeric polypeptide.