Stable Peptide-Deficient MHC Class I Chaperone Complexes
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Solution Overview
Problem
The instability of peptide-deficient MHC class I molecules limits the large-scale production of peptide-MHC class I multimers, leading to challenges in high-throughput screening for antigen-specific T cells and therapies, as existing methods result in sample aggregation and high background levels due to the use of conditional ligands.
Innovation Solution
The development of stable peptide-deficient MHC class I/chaperone complexes, where MHC class I heavy and light chains are incubated with placeholder peptides to form a complex, which is then contacted with a dipeptide and chaperone to displace the placeholder peptide, forming a stable peptide-deficient MHC class I/chaperone complex, enabling the production of peptide-MHC class I multimers for high-throughput applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conditional ligands are used to circumvent instability of peptide-deficient MHC class I molecules, then production of peptide-MHC class I multimers is enabled, but sample aggregation and precipitation occur during photolysis/peptide exchange
Solution Approach 1:
The patent introduces a conditional ligand as an intermediary molecule that temporarily occupies the peptide-binding groove of MHC class I molecules. This conditional ligand can be cleaved by UV irradiation or heat treatment, allowing subsequent exchange with target peptides. The conditional ligand acts as a mediator that enables stable production of peptide-deficient MHC class I multimers while preventing aggregation during the peptide exchange process.
Solution Approach 2:
The patent applies preliminary action by pre-loading MHC class I molecules with conditional ligands before multimerization. This allows the MHC class I molecules to be stabilized in a peptide-deficient state during production and storage, and only after multimerization is complete does the peptide exchange occur through conditional ligand cleavage. This sequence prevents aggregation by maintaining stability during the critical multimerization step.
2Measurement precision
If high-throughput screening using large arrays of peptide-MHC class I multimers is implemented, then identification of antigen-specific T cells and antigens is improved, but production capacity is limited by instability of peptide-deficient MHC class I molecules
Solution Approach 1:
The conditional ligand serves as an intermediary that enables large-scale production of peptide-deficient MHC class I multimers by providing temporary stability during production and storage. This mediator allows the accumulation of large quantities of multimers needed for high-throughput screening, which would otherwise be impossible due to instability.
Solution Approach 2:
The patent utilizes parameter changes by controlling the stability of MHC class I molecules through the conditional ligand. The conditional ligand can be cleaved by changing physical parameters such as UV irradiation or temperature, transforming the MHC class I molecules from a stable peptide-deficient state during production to an unstable state capable of peptide exchange during screening. This parameter control enables both high productivity and high measurement precision.
3Ease of manufacture
If suboptimal peptides are used in peptide exchange, then peptide-MHC class I complexes can be formed, but high background levels of exchange occur
Solution Approach 1:
The conditional ligand acts as an intermediary that facilitates controlled peptide exchange. By designing the conditional ligand with specific cleavage properties, the patent enables selective exchange with optimal peptides while preventing exchange with suboptimal peptides. This mediator ensures that only peptides with sufficient affinity can displace the conditional ligand, thereby reducing background levels while maintaining ease of complex formation.
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.