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Safeguarding intestine cells against enteropathogenic Escherichia coli by intracellular protein reaction, a preventive antibacterial mechanism.


ABSTRACT: A critical problem in the fight against bacterial infection is the rising rates of resistance and the lack of new antibiotics. The discovery of new targets or new antibacterial mechanisms is a potential solution but is becoming more difficult. Here we report an antibacterial mechanism that safeguards intestine cells from enteropathogenic Escherichia coli (EPEC) by shutting down an infection-responsive signal of the host intestine cell. A key step in EPEC infection of intestinal cells involves Tir-induced actin reorganization. Nck mediates this event by binding with Tir through its SH2 domain (Nck-SH2) and with WIP through its second SH3 domain (Nck-SH3.2). Here we report the design of a synthetic peptide that reacts precisely with a unique cysteine of the Nck-SH3.2 domain, blocks the binding site of the Nck protein, and prevents EPEC infection of Caco-2 cells. Oral update of this nontoxic peptide before EPEC administration safeguards mice from EPEC infection and diarrhea. This study demonstrates domain-specific blockage of an SH3 domain of a multidomain adaptor protein inside cells and the inhibition of Tir-induced rearrangement of the host actin cytoskeleton as a previously unknown antibacterial mechanism.

SUBMITTER: Qiu J 

PROVIDER: S-EPMC7071885 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Safeguarding intestine cells against enteropathogenic <i>Escherichia coli</i> by intracellular protein reaction, a preventive antibacterial mechanism.

Qiu Jiaming J   Nie Yunyu Y   Zhao Yuan Y   Zhang Yu Y   Li Linting L   Wang Rui R   Wang Miaomiao M   Chen Sheng S   Wang Jianhao J   Li Yong-Qiang YQ   Xia Jiang J  

Proceedings of the National Academy of Sciences of the United States of America 20200224 10


A critical problem in the fight against bacterial infection is the rising rates of resistance and the lack of new antibiotics. The discovery of new targets or new antibacterial mechanisms is a potential solution but is becoming more difficult. Here we report an antibacterial mechanism that safeguards intestine cells from enteropathogenic <i>Escherichia coli</i> (EPEC) by shutting down an infection-responsive signal of the host intestine cell. A key step in EPEC infection of intestinal cells invo  ...[more]

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