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- W2012607141 abstract "ABSTRACT Streptococcus pneumoniae is a major causative agent of otitis media, pneumonia, bacteremia, and meningitis. Pneumolysin (Ply), a member of the cholesterol-dependent cytolysins (CDCs), is produced by virtually all clinical isolates of S. pneumoniae , and ply mutant strains are severely attenuated in mouse models of colonization and infection. In contrast to all other known members of the CDC family, Ply lacks a signal peptide for export outside the cell. Instead, Ply has been hypothesized to be released upon autolysis or, alternatively, via a nonautolytic mechanism that remains undefined. We show that an exogenously added signal sequence is not sufficient for Sec-dependent Ply secretion in S. pneumoniae but is sufficient in the surrogate host Bacillus subtilis . Previously, we showed that Ply is localized primarily to the cell wall compartment in the absence of detectable cell lysis. Here we show that Ply released by autolysis cannot reassociate with intact cells, suggesting that there is a Ply export mechanism that is coupled to cell wall localization of the protein. This putative export mechanism is capable of secreting a related CDC without its signal sequence. We show that B. subtilis can export Ply, suggesting that the export pathway is conserved. Finally, through truncation and domain swapping analyses, we show that export is dependent on domain 2 of Ply." @default.
- W2012607141 created "2016-06-24" @default.
- W2012607141 creator A5009524336 @default.
- W2012607141 creator A5054764389 @default.
- W2012607141 creator A5059940971 @default.
- W2012607141 date "2012-07-15" @default.
- W2012607141 modified "2023-10-17" @default.
- W2012607141 title "Export Requirements of Pneumolysin in Streptococcus pneumoniae" @default.
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- W2012607141 doi "https://doi.org/10.1128/jb.00114-12" @default.
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