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Adhesin degradation accelerates delivery of heat-labile toxin by enterotoxigenic Escherichia coli.


ABSTRACT: Many enteric pathogens, including enterotoxigenic Escherichia coli (ETEC), produce one or more serine proteases that are secreted via the autotransporter (or type V) bacterial secretion pathway. These molecules have collectively been referred to as SPATE proteins (serine protease autotransporter of the Enterobacteriaceae). EatA, an autotransporter previously identified in ETEC, possesses a functional serine protease motif within its secreted amino-terminal passenger domain. Although this protein is expressed by many ETEC strains and is highly immunogenic, its precise function is unknown. Here, we demonstrate that EatA degrades a recently characterized adhesin, EtpA, resulting in modulation of bacterial adhesion and accelerated delivery of the heat-labile toxin, a principal ETEC virulence determinant. Antibodies raised against the passenger domain of EatA impair ETEC delivery of labile toxin to epithelial cells suggesting that EatA may be an effective target for vaccine development.

SUBMITTER: Roy K 

PROVIDER: S-EPMC3191018 | biostudies-literature | 2011 Aug

REPOSITORIES: biostudies-literature

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Adhesin degradation accelerates delivery of heat-labile toxin by enterotoxigenic Escherichia coli.

Roy Koushik K   Kansal Rita R   Bartels Scott R SR   Hamilton David J DJ   Shaaban Salwa S   Fleckenstein James M JM  

The Journal of biological chemistry 20110708 34


Many enteric pathogens, including enterotoxigenic Escherichia coli (ETEC), produce one or more serine proteases that are secreted via the autotransporter (or type V) bacterial secretion pathway. These molecules have collectively been referred to as SPATE proteins (serine protease autotransporter of the Enterobacteriaceae). EatA, an autotransporter previously identified in ETEC, possesses a functional serine protease motif within its secreted amino-terminal passenger domain. Although this protein  ...[more]

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