Site-specific acylation of a bacterial virulence regulator attenuates infection.
Nat Chem Biol
; 16(1): 95-103, 2020 01.
Article
em En
| MEDLINE
| ID: mdl-31740807
ABSTRACT
Microbiota generates millimolar concentrations of short-chain fatty acids (SCFAs) that can modulate host metabolism, immunity and susceptibility to infection. Butyrate in particular can function as a carbon source and anti-inflammatory metabolite, but the mechanism by which it inhibits pathogen virulence has been elusive. Using chemical proteomics, we found that several virulence factors encoded by Salmonella pathogenicity island-1 (SPI-1) are acylated by SCFAs. Notably, a transcriptional regulator of SPI-1, HilA, was acylated on several key lysine residues. Subsequent incorporation of stable butyryl-lysine analogs using CRISPR-Cas9 gene editing and unnatural amino acid mutagenesis revealed that site-specific modification of HilA impacts its genomic occupancy, expression of SPI-1 genes and attenuates Salmonella enterica serovar Typhimurium invasion of epithelial cells, as well as dissemination in vivo. Moreover, a multiple-site HilA lysine acylation mutant strain of S. Typhimurium was resistant to butyrate inhibition ex vivo and microbiota attenuation in vivo. Our results suggest that prominent microbiota-derived metabolites may directly acylate virulence factors to inhibit microbial pathogenesis in vivo.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Salmonella typhimurium
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Virulência
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Regulação Bacteriana da Expressão Gênica
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Ilhas Genômicas
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Ácidos Graxos
Limite:
Animals
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article