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• W2912385955 abstract "Human pathogenic gram‐negative bacteria, such as enteropathogenic Escherichia coli (EPEC), rely on type III secretion systems (T3SS) to translocate virulence factors directly into host cells. The coiled‐coil domains present in the structural proteins of T3SS are conformed by amphipathic alpha‐helical structures that play an important role in the protein‐protein interaction and are essential for the assembly of the translocation complex. To investigate the inhibitory capacity of these domains on the T3SS of EPEC, we synthesized peptides between 7 and 34 amino acids based on the coiled‐coil domains of proteins that make up this secretion system. This analysis was performed through in vitro hemolysis assays by assessing the reduction of T3SS‐dependent red blood cell lysis in the presence of the synthesized peptides. After confirming its inhibitory capacity, we performed molecular modeling assays using combined techniques, docking‐molecular dynamic simulations, and quantum‐mechanic calculations of the various peptide‐protein complexes, to improve the affinity of the peptides to the target proteins selected from T3SS. These techniques allowed us to demonstrate that the peptides with greater inhibitory activity, directed against the coiled‐coil domain of the C‐terminal region of EspA, present favorable hydrophobic and hydrogen bond molecular interactions. Particularly, the hydrogen bond component is responsible for the stabilization of the peptide‐protein complex. This study demonstrates that compounds targeting T3SS from pathogenic bacteria can indeed inhibit bacterial infection by presenting a higher specificity than broad‐spectrum antibiotics. In turn, these peptides could be taken as initial structures to design and synthesize new compounds that mimic their inhibitory pharmacophoric pattern." @default.
• W2912385955 created "2019-02-21" @default.
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• W2912385955 date "2019-02-11" @default.
• W2912385955 modified "2023-10-16" @default.
• W2912385955 title "An inhibitory mechanism of action of coiled‐coil peptides against type three secretion system from enteropathogenic <scp>Escherichia coli</scp>" @default.
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• W2912385955 doi "https://doi.org/10.1002/psc.3149" @default.
• W2912385955 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30746861" @default.
• W2912385955 hasPublicationYear "2019" @default.
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