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• W2906162846 abstract "The largest superfamily of bacterial virulence factors is pore-forming toxins (PFTs). PFTs are secreted by both pathogenic and non-pathogenic bacteria. PFTs sometimes kill or induce pro-pathogen signaling in mammalian cells, all primarily through plasma membrane perforation, though the parameters that determine these outcomes are unclear. Membrane binding, calcium influx, pore size, and membrane repair are factors that influence PFT cytotoxicity. To test the contribution of membrane binding to cytotoxicity and repair, we compared the closely related, similarly-sized PFTs Perfringolysin O (PFO) from Clostridium perfringens and Streptolysin O (SLO) from Streptococcus pyogenes. Cell death kinetics for PFO and SLO were different because PFO increased in cytotoxicity over time. We introduced known L3 loop mutations that swap binding affinity between toxins and measured hemolytic activity, nucleated cell death kinetics and membrane repair using viability assays, and live cell imaging. Altered hemolytic activity was directly proportional to toxin binding affinity. In contrast, L3 loop alterations reduced nucleated cell death, and they had limited effects on cytotoxicity kinetics and membrane repair. This suggests other toxin structural features, like oligomerization, drives these parameters. Overall, these findings suggest that repair mechanisms and toxin oligomerization add constraints beyond membrane binding on toxin evolution and activity against nucleated cells." @default.
• W2906162846 created "2019-01-01" @default.
• W2906162846 creator A5043051602 @default.
• W2906162846 creator A5069522130 @default.
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• W2906162846 date "2018-12-21" @default.
• W2906162846 modified "2023-10-14" @default.
• W2906162846 title "Multiple Parameters Beyond Lipid Binding Affinity Drive Cytotoxicity of Cholesterol-Dependent Cytolysins" @default.
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• W2906162846 doi "https://doi.org/10.3390/toxins11010001" @default.
• W2906162846 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6356533" @default.
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• W2906162846 hasPublicationYear "2018" @default.
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