PExSR Method for High-Affinity Binding Agent Generation
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Solution Overview
Problem
Current methods for generating high-affinity reagents, such as ribosome-display and phage-display technologies, face limitations in library size and efficiency, particularly in integrating both approaches for primary selection schemes and achieving high-affinity binding agents without extensive labor or mRNA selection schemes.
Innovation Solution
A method combining ribosome-display and phage-display technologies, referred to as Primer Extension Selection Rescue (PExSR), which involves generating a ribosome-display library, screening for binding agents, amplifying nucleic acids, annealing to a phage-display vector, and conducting additional rounds of selection to identify high-affinity phage clones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ribosome-display library size is increased to improve selection quality, then the likelihood of selecting high affinity reagents increases, but the number of E. coli cells that can be feasibly grown limits the library size to approximately 1×10^10 members
Solution Approach 1:
The patent combines ribosome-display and phage-display technologies into an integrated workflow. Ribosome-display is used for primary selection to identify binding agents from a large library, followed by phage-display for affinity maturation and secondary selection. This merging allows the system to overcome the library size limitation of ribosome-display while maintaining high selection quality through the complementary strengths of both methods.
2Adaptability or versatility
If ribosome-display is used to start with a freshly translated library achieving 100-fold greater diversity, then library diversity increases, but additional steps and effort are required compared to phage-display
Solution Approach 1:
The patent performs preliminary selection using ribosome-display on freshly translated libraries to identify high-affinity binders before transitioning to phage-display. This preliminary action captures the diversity advantage of ribosome-display early in the process, then leverages the simpler, more automated phage-display workflow for subsequent affinity maturation rounds, reducing overall process complexity.
Solution Approach 2:
The patent segments the selection process into distinct phases: ribosome-display for primary selection and diversity capture, followed by phage-display for affinity maturation and secondary selection. This segmentation allows each method to be optimized for its specific function while avoiding the need to use one complex method for the entire process.
3Ease of manufacture
If phage-display libraries are stored frozen and subjected to freeze-thaw before selection, then library storage is simplified, but potential loss of reagent activity occurs
Solution Approach 1:
The patent uses phage-display systems where the phage particles themselves serve as both the display vehicle and the selectable unit. The phage can be stored frozen like traditional phage libraries, and the freeze-thaw process is inherently tolerated by the phage structure. This self-service approach allows simplified storage without compromising reagent activity because the phage are naturally resistant to freeze-thaw stress.
Data Source
AI summary
A combined ribosome-display and phage-display method and kit for carrying out the method are provided. The method includes screening a ribosome-display library of binding agents to identify binding agents that interact with one or more target molecules of interest, converting the RNA encoding the binding agents to a phage-display format by amplification and primer extension, and the screening the phage-display library to enrich for binding agents that interact with one or more target molecules of interest.