Peptide Array Binding Site Mapping Without Antibodies
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Solution Overview
Problem
Current methods for determining protein binding sites, such as epitope mapping, are laborious, expensive, and often require antibodies that may not be available or of sufficient quality, and rely on detailed protein structure information, limiting their accuracy and applicability.
Innovation Solution
A method involving contacting a protein with a plurality of monomers to create a protein:polymer complex, digesting it to produce a peptide:polymer complex, and isolating and sequencing the peptides to identify binding sites without requiring prior knowledge of the protein structure or availability of antibodies, using molecularly imprinted polymers and sequencing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray crystallography or NMR analysis is used to determine binding sites, then accurate structural information can be obtained, but the process becomes very laborious and expensive requiring large amounts of antibodies or detailed structural knowledge
Solution Approach 1:
The patent uses peptide arrays as simplified copies or representations of the protein surface, where individual peptides correspond to specific regions of the protein. This allows binding site mapping without requiring complex crystallography or NMR, replacing the complex structural determination process with a simpler array-based approach that maintains accuracy while reducing labor and cost
Solution Approach 2:
The protein is divided into multiple peptide segments that are synthesized and arranged in an array format. This segmentation allows the binding site to be mapped by testing individual peptide regions rather than analyzing the entire complex protein structure at once, significantly simplifying the overall process while maintaining precise binding site identification
2Reliability
If antibody-based epitope mapping is used, then binding sites can be identified, but antibodies must be available and of sufficient quality which is not always the case
Solution Approach 1:
The patent introduces a peptide array as an intermediary system between the antibody and the native protein. Instead of requiring the antibody to bind directly to the complex native protein structure, the array provides a simplified, accessible interface that mediates the binding interaction, allowing reliable epitope mapping even when antibodies are limited or of variable quality
Solution Approach 2:
The patent changes the physical and chemical parameters of the binding assay by using synthesized peptides with controlled sequences and presentations on the array, rather than relying on the native protein's complex structure and antibody availability. This parameter change makes the method more adaptable to different proteins and antibody qualities while maintaining reliability
3Measurement precision
If detailed protein structure information is required for binding site determination, then accurate mapping can be achieved, but the method becomes limited in applicability to proteins with known structures
Solution Approach 1:
The patent performs preliminary synthesis of peptide sequences based on the protein's amino acid sequence information, which is much more readily available than detailed 3D structural data. This preliminary action of creating peptide representations allows binding site mapping to proceed without requiring detailed structural information, expanding method applicability while maintaining precision through the array-based binding assay
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
Enables the identification of binding sites on proteins without needing antibodies or detailed protein structure information, facilitating the generation of high-affinity binding partners for research, diagnostics, or therapeutic applications, and providing novel insights into protein interactions.
Implementation Method 1
contacting the target protein with a plurality of monomers, and polymerising the monomers to create a protein:polymer complex
Implementation Method 2
digesting the protein in the complex to produce a peptide:polymer complex
Data Source
AI summary
The invention provides methods, compositions, and kits for the characterisation and analysis of proteins. Methods are provided for determining, on a protein, a binding site for a binding partner, the methods comprising: contacting a protein with a plurality of monomers, and polymerising the monomers to create a protein:polymer complex; digesting the protein in the complex to produce a peptide:polymer complex; isolating the peptide:polymer complex; and sequencing the peptide, wherein the peptide corresponds to a binding site for a binding partner.