Chaperone-Stabilized Peptide-Deficient MHC-I for Low-Background Multimers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The instability of peptide-deficient MHC class I molecules hinders large-scale production of peptide-MHC class I multimers, leading to sample aggregation and high background levels during photolysis/peptide exchange, limiting high-throughput screening strategies for antigen-specific T cells.
Innovation Solution
Formation of stable peptide-deficient MHC class I/chaperone complexes through incubation with placeholder peptides and chaperones, followed by dipeptide exchange to create solubilized and purified peptide-MHC class I multimers, which are then multimerized with detectable labels for high-throughput applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If peptide-deficient MHC class I molecules are used for large-scale production of peptide-MHC class I multimers, then productivity is improved, but stability of the molecules deteriorates
Solution Approach 1:
The patent introduces chaperone proteins (such as TAPBPR, ERp57, calreticulin, and GRP94) as intermediary molecules that bind to peptide-deficient MHC class I molecules. These chaperones act as stabilizing agents that prevent aggregation and precipitation of the unstable peptide-deficient MHC class I molecules during large-scale production, enabling high-throughput screening applications without compromising molecular stability.
2Stability of the object's composition
If conditional ligands are used to circumvent instability of peptide-deficient MHC class I molecules, then stability is improved, but sample aggregation and precipitation occur during photolysis/peptide exchange
Solution Approach 1:
The patent extracts and removes the problematic conditional ligand component from the system. Instead of using conditional ligands that require photolysis or temperature-induced release (which cause aggregation), the invention directly introduces the desired peptide antigen to the chaperone-stabilized peptide-deficient MHC class I complex. This eliminates the harmful photolysis step and associated aggregation issues while maintaining stability.
3Ease of manufacture
If conditional ligands are used for peptide exchange, then peptide-MHC class I complex formation is improved, but background levels of exchange increase
Solution Approach 1:
The patent applies preliminary stabilization by pre-forming complexes between chaperone proteins and peptide-deficient MHC class I molecules before introducing the peptide antigen. This preliminary chaperone binding creates a stable platform that enhances the specificity and efficiency of subsequent peptide exchange, reducing non-specific background binding and improving the precision of antigen-specific T cell identification.
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 stable, solubilized peptide-MHC class I multimers suitable for high-throughput screening of antigen-specific T cells, reducing sample aggregation and background noise, and facilitating the detection and characterization of T cell profiles.
Implementation Method 1
contacting the placeholder peptide-MHC class I complex with a dipeptide and chaperone, thereby displacing the placeholder peptide from the placeholder peptide-MHC complex and forming the peptide deficient-MHC class I/chaperone complex
Data Source
AI summary
Compositions that include stable peptide deficient MHC class I/chaperone complexes and methods of making and using such complexes are provided. In particular embodiments, such peptide deficient MHC class I/chaperone complexes are used to form peptide MHC class I (pMHC-I) multimers useful for high throughput applications, such as, for the detection of antigen specific T cells and characterization of T cell profiles in subjects.