Lymphocyte Selection Using Spatially Linked Antigen Peptides
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Solution Overview
Problem
Existing methods for selecting B lymphocytes for monoclonal antibodies are complex and do not effectively target conformational epitopes, leading to suboptimal antibody affinity.
Innovation Solution
A method for selecting B or T lymphocytes by identifying cells that bind to distinct peptides derived from a protein antigen, which are three-dimensionally close in the antigen's structure, followed by isolating and preparing antibodies or TCRs from these cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If B lymphocytes are selected based on primary structure of target protein antigens (linear epitopes), then the selection process is simple, but the antibody affinity for conformational epitopes is poor
Solution Approach 1:
The patent segments the antigen into multiple distinct peptides that are three-dimensionally close in the native protein structure. By selecting lymphocytes that bind to multiple such peptides simultaneously, the method captures conformational epitope recognition without requiring complex overall protein structures. This segmentation allows simplified peptide-based selection while maintaining affinity for conformational epitopes.
Solution Approach 2:
The patent uses peptide copies or fragments of the native protein antigen that preserve the three-dimensional spatial relationships of conformational epitopes. These peptide copies maintain the structural information needed for conformational epitope recognition while being simpler to handle than the full protein, thus resolving the contradiction between simplicity and affinity.
2Reliability
If monoclonal antibodies are prepared using traditional fusion methods with myeloma cells, then conformational epitope specificity can be achieved, but the process becomes relatively complex
Solution Approach 1:
The patent extracts and isolates B lymphocytes that specifically bind to multiple conformational epitope peptides from peripheral blood or lymphoid tissues. By directly isolating the functional B cells through peptide-based selection (e.g., flow cytometry), the method eliminates the need for complex cell fusion procedures while maintaining specificity for conformational epitopes.
Solution Approach 2:
The patent introduces peptide-based selection methods as an intermediary step between antigen exposure and antibody production. The peptides serve as mediators to identify and select B lymphocytes with appropriate conformational epitope recognition, simplifying the overall process by replacing direct cell fusion with a peptide-mediated selection approach.
3Reliability
If lymphocytes are selected using multiple distinct peptides that are three-dimensionally close in the antigen structure, then conformational epitope recognition is improved, but the selection criteria become more stringent
Solution Approach 1:
The patent applies local quality by focusing on specific spatial regions of the antigen structure. Instead of requiring recognition of the entire protein or diffuse epitopes, the method targets localized conformational epitopes represented by specific peptides in three-dimensional close proximity. This localized approach maintains high stringency for conformational epitope recognition while providing clear, measurable selection criteria based on spatial proximity of peptide binding sites.
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 production of monoclonal antibodies and TCRs that recognize conformational epitopes, improving their avidity and suitability for therapeutic and diagnostic applications.
Implementation Method 1
identifying at least one lymphocyte, in particular B or T lymphocyte, binding to at least two distinct peptides comprising sequences derived from the protein antigen
Data Source
AI summary
The present invention relates to a method for selecting lymphocytes recognizing a conformational epitope of a protein antigen from a population of cells, comprising a step of identifying at least one lymphocyte binding to at least two separate peptides comprising sequences of the protein antigen, in particular at least three separate peptides comprising sequences of the protein antigen.