Loadable Peptide-Free MHC Detection Molecules for Rare TCR Binding
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Solution Overview
Problem
Existing MHC-based T cell detection technologies face limitations in generating large peptide-MHC libraries, are inconsistent in detecting rare and weak interactions, and suffer from instability of pMHC complexes, leading to unreliable results, especially for cancer-associated antigens and mutation-derived neoepitopes.
Innovation Solution
The use of loadable detection molecules comprising peptide-free MHC class I molecules stabilized by a disulfide bridge, which can be loaded with antigenic peptides on demand, allowing for rapid generation of pMHC complexes and improved stability, enabling sensitive detection of rare and weak interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fluorescent labelled MHC multimers are used for T cell detection, then the detection can be performed, but the throughput is limited and the detection limit is high
Solution Approach 1:
The patent applies combinatorial encoding by changing the parameter of fluorophore composition. Each pMHC multimer is assigned a unique dual-color code from combinations of eight fluorophores, yielding 28 unique codes. This parameter change (from single fluorophore to combinatorial fluorophore sets) enables high-throughput detection while maintaining low detection limits through flow cytometry analysis of color combinations.
2Adaptability or versatility
If large libraries of different peptide-MHC complexes are generated, then more epitopes can be screened, but the process becomes complex and time-consuming
Solution Approach 1:
The patent segments the pMHC library generation process into independent components: MHC multimers are produced once and stably stored, then later combined with different fluorescently labeled peptides. This segmentation allows the complex library generation to be divided into manageable steps, reducing overall process complexity while maintaining high epitope screening capacity.
Solution Approach 2:
The patent performs preliminary action by pre-producing and stabilizing MHC multimers with extended half-lives before they are needed for detection. These pre-prepared MHC multimers are stored and later combined with fluorescent peptides, eliminating the need to generate complete pMHC complexes from scratch for each experiment, thus reducing complexity and saving time.
3Ease of manufacture
If peptide exchange technologies are used to generate multiple pMHC from single MHC stock, then resource efficiency improves, but the process requires additional steps and extended duration
Solution Approach 1:
The patent performs preliminary action by pre-producing MHC multimers with extended half-lives that remain stable without requiring immediate peptide exchange. This advance preparation eliminates the need for time-consuming peptide exchange steps (UV-mediated or temperature-induced) while maintaining resource efficiency, as the stable MHC multimers can be stored and used later with different fluorescent peptides.
4Reliability
If pMHC complexes are used for T cell detection, then antigen-specific detection is achieved, but the complexes are unstable and have limited functional lifetime
Solution Approach 1:
The patent segments the pMHC complex into two independent, stable components: MHC multimers and fluorescent peptides. Each component can be produced, purified, and stored separately with extended stability. When needed, they are combined fresh to form functional pMHC complexes for detection, ensuring both reliability and extended operational duration without degradation.
Solution Approach 2:
The patent performs preliminary action by pre-producing and stabilizing MHC multimers with extended half-lives through optimized production and storage conditions. These pre-stabilized MHC multimers maintain their structural integrity and binding capability over prolonged periods, ensuring reliable detection accuracy while extending the functional lifetime available for experiments.
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
The method provides a flexible, sensitive, and fast approach for high-throughput epitope identification and TCR specificity determination, capable of detecting rare and weak interactions, and maintaining stability over prolonged periods.
Implementation Method 1
peptide-free MHC class I molecules stabilized by a disulfide bridge
Implementation Method 2
contacting the loadable detection molecules with the at least one antigenic peptide to provide loaded detection molecules comprising at least one peptide-MHC (pMHC) class I molecule
Implementation Method 3
detecting binding of the loaded detection molecules to the one or more antigenic peptide responsive T cells
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
The present invention relates to detection of interactions between antigenic peptides and binding partners, such as T cell receptors (TCR) and antigenic peptide responsive T cells. In particular, the present invention relates to the provision of loadable detection molecules with peptide-free MHC molecules utilized for high throughput epitope identification and TCR specificity determination.