Trimerizing Peptide Inhibits Type IVb Pili Colonization
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Solution Overview
Problem
Current ETEC vaccines are ineffective against strains producing type IV pili and secretory colonization factors not covered by existing vaccines, and they fail to induce long-term immunity, particularly against prevalent strains like Longus in regions such as Latin America and North Africa.
Innovation Solution
A novel peptide that inhibits the colonization of pathogenic bacteria by binding to type IVb pili, comprising a first domain with specific amino acid sequences capable of binding to minor pilin and a second domain that trimerizes, allowing simultaneous binding to all binding sites on the pili, thereby preventing bacterial adhesion and colonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current ETEC vaccines are used, then immunity against covered strains is achieved, but effectiveness against type IV pili-producing strains and prevalent strains like Longus is insufficient
Solution Approach 1:
The peptide is designed to bind to a conserved region of minor pilin that is common across multiple type IV pili systems (CFA/III, Longus, Tcp, Cfc), enabling a single peptide to provide broad-spectrum protection against diverse ETEC strains that produce type IV pili, rather than requiring strain-specific vaccines
Solution Approach 2:
The peptide acts as an intermediary molecule that blocks the interaction between minor pilin and secretory colonization factors, preventing bacterial adhesion without requiring the immune system to recognize and neutralize multiple variable antigen structures
2Reliability
If live or inactivated ETEC vaccines are administered, then broad immune response is induced, but long-term immunity and protection against secretory colonization factors are not achieved
Solution Approach 1:
The invention extracts and targets the specific adhesion mechanism involving minor pilin and secretory colonization factors, separating this critical pathogenic function from the overall bacterial system, and neutralizing it with a peptide that specifically blocks this interaction without requiring complete bacterial inactivation
Solution Approach 2:
The peptide changes the binding parameters of the pilus-secretory factor interaction by introducing a competitive inhibitor that alters the affinity and specificity of the bacterial adhesion process, preventing colonization without affecting other bacterial functions
3Adaptability or versatility
If multiple antigens are introduced for broad immune coverage, then vaccine complexity increases, but manufacturing and immunization protocols become more difficult
Solution Approach 1:
Instead of introducing multiple different antigens from various ETEC strains, the invention uses a single synthesized peptide that copies and mimics the conserved binding interface of minor pilin, providing broad coverage through a simplified single-antigen approach rather than complex multi-antigen formulations
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
The peptide effectively inhibits the adhesion and colonization of type IVb pili-producing bacteria in digestive organs, offering a selective anti-adhesion mechanism with minimal impact on host cells and reducing the risk of drug-resistant bacteria emergence.
Implementation Method 1
a first domain having any one of the amino acid sequences of SEQ ID NO: 1 to 5 and 23, and capable of binding to minor pilin of type IVb pili
Implementation Method 2
a second domain having an amino acid sequence connected via a linker sequence to said first domain, and capable of trimerizing
Data Source
Figure 1(a)~1(b)
Figure 2(a)~3
Figure 4(a)~5(b)
AI summary
A peptide capable of preventing colonization of pathogenic bacteria in digestive organs comprises a first domain having an amino acid sequence capable of binding to minor pilin of type IVb pili, and a second domain having an amino acid sequence connected via a linker sequence to the first domain and capable of multimerizing.