Peptide Linker Systems for Protein Self-Assembly
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Solution Overview
Problem
The existing SpyTag/SpyCatcher system for protein covalent self-assembly has low reaction speed and efficiency, limiting its effectiveness in forming stable complexes, particularly in applications such as biological materials and vaccine development.
Innovation Solution
The development of novel peptide linker systems, including GvTag/SdCatcher, PsTag/SdCatcher, and SaTag/SdCatcher, which utilize spontaneous isopeptide bonds to enhance binding efficiency and stability, with specific amino acid sequences optimized for improved protein expression and immunogenicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SpyTag/SpyCatcher system is used for protein covalent self-assembly, then irreversible covalent interaction is achieved, but the reaction speed and efficiency are low
Solution Approach 1:
The patent modifies the amino acid sequences of SpyTag and SpyCatcher to create optimized variants (e.g., SpyTag003, SpyCatcher003) with improved reaction kinetics. Specific amino acid substitutions are made to enhance the isopeptide bond formation rate while maintaining the irreversible covalent interaction stability, thereby resolving the contradiction between reaction speed and interaction reliability.
Solution Approach 2:
The patent creates hybrid peptide-protein systems by combining optimized peptide tags with protein binding partners. These composite structures integrate the advantages of both peptide and protein components, achieving both fast reaction kinetics and stable covalent binding through the synergistic design of the tag-catcher pair.
2Ease of manufacture
If peptide tags are used to minimize interference on protein functions, then biosynthesis costs and immunogenic interference are reduced, but the affinity in interaction between peptide tag and protein is low
Solution Approach 1:
The patent optimizes the peptide tag sequence parameters to enhance binding affinity while maintaining the small size advantage. By carefully selecting and positioning specific amino acids in the tag sequence, the system achieves strong irreversible binding without increasing the tag size, thus preserving the low immunogenicity and ease of manufacture benefits.
3Reliability
If existing SpyTag/SpyCatcher sequences are modified and optimized, then binding efficiency is improved, but the system complexity increases
Solution Approach 1:
The patent divides the optimization process into manageable segments: first optimizing the peptide tag sequence, then optimizing the protein catcher sequence, and finally characterizing their interaction. This segmented approach allows systematic improvement of binding efficiency while tracking and managing the complexity introduced by each modification step.
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
These systems significantly improve the binding efficiency and reaction speed of protein self-assembly, leading to stronger immunogenic responses and higher antibody titers, with a simpler preparation method and higher protein expression levels compared to the existing SpyTag/SpyCatcher system.
Implementation Method 1
These two fragments can achieve covalent recombination via the formation of an isopeptide bond, such that molecules or components connected to the pepetide tag and the polypeptide binding partner, respectively are fused
Data Source
AI summary
Disclosed is a combination of peptide linkers for protein covalent self-assembly using a spontaneous isopeptide bond, including a peptide linker 1 and a peptide linker 2. The peptide linker 1 contains a peptide chain having an amino acid sequence as shown in SEQ ID NO: 5, and the peptide linker 2 contains any one or more of peptide chains having amino acid sequences as shown in SEQ ID NOs: 11, 13, 14, and 46. The present disclosure constructs a novel protein self-assembly system based on an isopeptide bond, which effectively solves the problem of low binding efficiency of an existing SpyTag/SpyCatcher system, can significantly improve the reaction efficiency of molecules or components fused to a peptide tag and polypeptide thereof, and has a binding efficiency stronger than that of a SpyTag003/SpyCatcher003 system.