A secreted bacterial peptidoglycan hydrolase enhances tolerance to enteric pathogens.

A secreted bacterial peptidoglycan hydrolase enhances tolerance to enteric pathogens.
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DOI:
10.1126/science.aaf3552
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发表时间:
2016-09-23
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Hang HC
Hang HC
中科院分区:
其他
文献类型:
--
作者:
Rangan KJ;Pedicord VA;Wang YC;Kim B;Lu Y;Shaham S;Mucida D;Hang HC

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The intestinal microbiome modulates host susceptibility to enteric pathogens, but the specific protective factors and mechanisms of individual bacterial species are not fully characterized. We show that secreted antigen A (SagA) from Enterococcus faecium is sufficient to protect Caenorhabditis elegans against Salmonella pathogenesis by promoting pathogen tolerance. The NlpC/p60 peptidoglycan hydrolase activity of SagA is required and generated muramyl-peptide fragments that are sufficient to protect C. elegans against Salmonella pathogenesis in a tol-1-dependent manner. SagA can also be expressed and secreted in other bacteria and improve the protective activity of probiotics against Salmonella pathogenesis in C. elegans and mice. Our study highlights how protective intestinal bacteria can modify microbial-associated molecular patterns to enhance pathogen tolerance.
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