Peptide Library Screening via DNA-Tagged In Vitro Translation
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Solution Overview
Problem
Current methods for identifying synthetic molecular binding agents from large synthetic small-molecule libraries are labor-intensive and lack cost- and time-effectiveness, struggling to efficiently explore the binding affinities of diverse molecules for rare high-affinity agents.
Innovation Solution
A method involving peptide libraries tagged with DNA sequences, where peptide libraries comprising thousands to millions of constructs are used to identify specific peptides binding to target molecules, with subsequent cycles of mutagenesis and screening to enhance binding affinity, utilizing techniques like complete single residue mutagenesis, sliding window mutagenesis, and alanine scanning to generate variant peptides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large synthetic small-molecule libraries are used to identify binding agents, then the diversity of molecules to be screened increases, but the labor intensity and time consumption increase significantly
Solution Approach 1:
The patent replaces manual chemical synthesis and screening with automated in vitro translation systems. Ribosomes synthesize peptides from DNA templates in a high-throughput manner, eliminating the need for individual chemical synthesis of each molecule while maintaining library diversity of millions of constructs.
Solution Approach 2:
The patent changes the fundamental parameter of molecule synthesis from chemical methods to biological translation methods. By using cell-free translation systems with purified ribosomes, the system can rapidly produce diverse peptide libraries without the time-consuming chemical synthesis steps, achieving both high diversity and high throughput.
2Measurement precision
If individual chemical synthesis of each molecule is performed, then the binding affinity can be precisely measured, but the process becomes labor-intensive and costly
Solution Approach 1:
The patent merges the synthesis of millions of different peptide constructs into a single in vitro translation reaction mixture. All peptides are synthesized simultaneously by ribosomes using different DNA templates, eliminating the need for individual synthesis while maintaining the ability to precisely measure binding affinities through subsequent screening assays.
Solution Approach 2:
The patent uses DNA sequences as templates to direct ribosomal synthesis of peptide copies. Each DNA sequence serves as a template for producing multiple copies of its corresponding peptide, enabling rapid production of large library sizes without manual synthesis of each unique molecule.
3Adaptability or versatility
If starting abundances of molecules vary in large libraries, then the library diversity increases, but the ability to identify rare high-affinity binding agents decreases
Solution Approach 1:
The patent incorporates normalization procedures that use the known starting abundances of peptides (derived from DNA template concentrations) as reference values. By comparing observed binding signals against expected abundances, the system can identify true high-affinity binders even when starting abundances vary across the library, effectively using feedback from abundance data to correct measurement biases.
Data Source
AI summary
The present invention provides methods of maturing a peptide library and of identifying peptides having increased specific binding to a target molecule and/or differential specific binding to target molecules. The present invention also provide methods of developing diagnostic assays, detection kits and therapeutic agents with the peptides.