Antigenic Protein Cationization for Antibody Detection Reagents
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Solution Overview
Problem
Current methods for antibody detection, such as ELISA, face challenges with poorly soluble antigenic proteins that aggregate or form disulfide bonds, reducing detection sensitivity and stability, and require multiple epitope peptides and beads, making them cumbersome and inefficient.
Innovation Solution
A method involving cationization of antigenic proteins using thiosulfonate compounds like TAPS-sulfonate to solubilize and bind them to carriers like magnetic beads, preventing disulfide bond formation and maintaining protein stability for long-term storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If denatured proteins or poorly soluble proteins are used as antigens, then water solubility is improved, but protein stability deteriorates due to aggregation and disulfide bond formation
Solution Approach 1:
The patent applies parameter changes by modifying the chemical state of thiol groups through cationization. TAPS-sulfonate converts neutral thiol groups into positively charged sulfonium ions, changing the electrostatic properties of the protein. This parameter change prevents disulfide bond formation while maintaining protein stability and solubility, resolving the contradiction between stability and detection reliability.
Solution Approach 2:
TAPS-sulfonate acts as an intermediary compound that binds to thiol groups on antigenic proteins. This intermediary prevents direct interaction between thiol groups that would lead to disulfide bond formation and aggregation, while also maintaining protein solubility. The mediator approach resolves the contradiction by introducing a protective intermediate substance.
2Adaptability or versatility
If partial peptides are used to cover all epitopes, then detection coverage is improved, but device complexity increases due to needing multiple bead types
Solution Approach 1:
The patent applies universality by using full-length antigenic proteins that naturally contain all epitope regions. A single bead type can immobilize the complete protein, providing universal coverage for all epitopes simultaneously. This eliminates the need for multiple specialized bead types, resolving the contradiction between versatility and device complexity.
Solution Approach 2:
The invention merges all epitope-specific information into a single full-length protein molecule. Instead of separating epitopes across multiple peptides and bead types, the complete antigenic protein consolidates all epitopic regions in one structure, allowing comprehensive detection with a unified reagent system.
3Reliability
If full-length antigenic proteins are used, then epitope exposure is improved, but solubility deteriorates due to hydrophobic moieties
Solution Approach 1:
The patent changes the charge parameter of the protein by cationizing thiol groups with TAPS-sulfonate. This introduces positive charges that increase electrostatic repulsion and improve solubility of full-length proteins with hydrophobic regions. The parameter change allows maintaining full-length proteins for epitope exposure while resolving solubility issues.
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 enables efficient production of stable reagents for detecting antibodies against poorly soluble antigens, independent of HLA types, with improved solubility and storage stability, allowing for effective detection of cancer-specific antibodies.
Implementation Method 1
TAPS can bind to thiol groups in a protein to reversibly cationize the protein. The cationized protein exhibits improved solubility in water.
Implementation Method 2
TAPS can bind to thiol groups in a protein to reversibly cationize the protein
Implementation Method 3
allowing the cationized antigenic protein to bind to the carrier
Data Source
AI summary
The present invention provides the following: a method for efficiently producing a reagent for detecting an antibody that specifically binds with an insoluble antigen protein present in a liquid sample; a reagent for antibody detection produced by the production method; and a use of the antibody. In a step for solubilizing an antigen protein, it is possible to efficiently solubilize and recover the antigen protein by using a cationizing agent; therefore, when compared to conventional methods, it is possible to efficiently produce a reagent for detecting an antibody that has bound to multiple antigen protein molecules in a carrier.