Anti-infective bile acids bind and inactivate a Salmonella virulence regulator.

Anti-infective bile acids bind and inactivate a Salmonella virulence regulator.
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DOI:
10.1038/s41589-022-01122-3
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发表时间:
2023-01
影响因子:
14.8
通讯作者:
Hang, Howard C.
Hang, Howard C.
中科院分区:
生物学1区
文献类型:
--
作者:
Yang, Xinglin;Stein, Kathryn R.;Hang, Howard C.

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Bile acids are prominent host and microbiota metabolites that modulate host immunity and microbial pathogenesis. However, the mechanisms by which bile acids suppress microbial virulence are not clear. To identify the direct protein targets of bile acids in bacterial pathogens, we performed activity-guided chemical proteomic studies. In Salmonella enterica serovar Typhimurium, chenodeoxycholic acid (CDCA) most effectively inhibited the expression of virulence genes, invasion of epithelial cells and interacted with many proteins. Notably, we discovered that CDCA can directly bind and inhibit the function of HilD, an important transcriptional regulator of S. Typhimurium virulence and pathogenesis. Our characterization of bile acid-resistant HilD mutants in vitro and in S. Typhimurium infection models, suggests HilD is one of the key protein targets of anti-infective bile acids. This study highlights the utility of chemical proteomics to identify the direct protein targets of microbiota metabolites for mechanistic studies in bacterial pathogens.
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