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Related Experiment Video

Updated: Oct 25, 2025

Biomimetic Materials to Characterize Bacteria-host Interactions

Biomimetic Materials to Characterize Bacteria-host Interactions

Published on: November 16, 2015

Inhibiting Type VI Secretion System Activity with a Biomimetic Peptide Designed To Target the Baseplate Wedge

Y Cherrak¹, I Filella-Merce^2,3, V Schmidt¹

¹Laboratoire d'Ingénierie des Systèmes Macromoléculaires, Institut de Microbiologie de la Méditerranée, UMR7255, Aix-Marseille Université-CNRS, Marseille, France.

|August 10, 2021

Summary

This summary is machine-generated.

Researchers developed a novel biomimetic cyclic peptide (BCP) to block the type VI secretion system (T6SS), a key virulence factor in many bacterial pathogens. This antivirulence strategy offers a promising new approach against drug-resistant infections.

Keywords:

T6SS bacterial secretion system bioinformatic biomimetic peptide protein-protein interface type VI secretion system virulence inhibitor

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Engineering Antiviral Agents via Surface Plasmon Resonance

Engineering Antiviral Agents via Surface Plasmon Resonance

Published on: June 14, 2022

Area of Science:

Microbiology
Structural Biology
Drug Discovery

Background:

Bacterial infections pose a significant threat due to increasing multidrug resistance.
Targeting bacterial virulence factors, rather than growth, is a promising antivirulence strategy.
The type VI secretion system (T6SS) is a critical virulence factor in many human pathogens, including ESKAPE bacteria.

Purpose of the Study:

To identify and validate a target for broad-spectrum T6SS inhibition.
To rationally design a novel therapeutic agent against T6SS-mediated virulence.
To demonstrate a proof of concept for an antivirulence strategy targeting T6SS assembly.

Main Methods:

Protein-protein interaction analysis (TssK-TssG interface).
In silico and biochemical studies for interface conservation.
High-resolution structural determination of the TssKFGE wedge complex.
Rational design of a biomimetic cyclic peptide (BCP) based on structural data.
Inhibition assays in bacterial cultures to assess T6SS function.

Main Results:

The TssK-TssG interface was identified as crucial for T6SS baseplate assembly in enteroaggregative Escherichia coli (EAEC).
The interface determinants are conserved across various pathogenic species, indicating broad therapeutic potential.
A rationally designed BCP effectively blocked T6SS baseplate assembly and inhibited T6SS function.
This BCP is the first compound designed from structural knowledge to exhibit anti-T6SS activity.

Conclusions:

The TssK-TssG interface is a validated target for T6SS inhibition.
Biomimetic cyclic peptides represent a novel class of antivirulence agents.
This study provides a new model for developing antivirulence therapies against T6SS-dependent pathogens.