Targeted Codon Degeneracy for Peptide Library Construction
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Solution Overview
Problem
Current methods for constructing peptide libraries, such as phylomer libraries, result in large libraries due to being constructed from the whole genome, fail to preserve peptide structure and function when removed from the context of the larger protein, and require additional mutations for structure restoration, which are not adequately addressed.
Innovation Solution
A method involving identifying crucial residues for ligand binding, constructing a specialized peptide library by synthesizing DNA primers with degeneracy, amplifying DNA fragments, and ligating them to form a DNA library that expresses peptides with pharmacologic activity, optimizing residues through selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phylomer libraries are constructed from the whole genome, then peptide diversity is generated, but the library size becomes excessively large and peptide structure/function is lost when removed from protein context
Solution Approach 1:
The patent segments the protein sequence into discrete peptide fragments of specific lengths (e.g., 5-20 amino acids) derived from conserved domains or motifs. This segmentation reduces the effective library size compared to using the whole genome while maintaining peptide diversity, as only relevant functional segments are included rather than all possible genomic sequences.
Solution Approach 2:
The patent extracts specific functional motifs, conserved domains, or structurally important regions from the protein sequence and uses these as the basis for peptide library construction. This extraction approach ensures that peptides retain their structural and functional properties by removing them from the context of the larger protein while preserving their essential characteristics.
2Ease of manufacture
If random peptide libraries are used, then library construction is simple, but the library size becomes too large for effective screening
Solution Approach 1:
The patent applies local quality by focusing library construction on specific regions of the protein sequence that are known to be functionally important, such as ligand binding sites or conserved motifs. This allows the library to be constructed with targeted degeneracy at specific positions while maintaining simplicity in the overall construction process, avoiding the need to generate all possible random sequences.
3Weight of stationary object
If peptides are removed from the context of the larger protein, then peptide isolation is achieved, but structure and function are lost
Solution Approach 1:
The patent performs preliminary analysis of the protein sequence to identify conserved domains, motifs, and structurally important regions before constructing the peptide library. This preliminary action ensures that only peptides likely to maintain their structure and function are selected, allowing for reliable isolation while preserving biological activity.
Data Source
AI summary
A method of library construction for peptide generation and, more particularly, to a method of construction of a DNA library built for selection of peptides that starts with a protein sequence known to bind to a target, wherein the protein sequence is used to generate DNA sequences which are then recombined and wherein each codon of the recombined DNA sequences has degenerate bases that cover between 1 and 20 of 20 possible amino acids.