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• W2021951566 abstract "Pseudomonas exotoxin A (PE) is a cytotoxin composed of three structural domains. Domain I is responsible for cell binding, domain II for membrane translocation enabling access to the cytosol, and domain III for the catalytic inactivation of protein synthesis, which results in cell death. To investigate the role of the six alpha-helices (A-F) that form the translocation domain, we deleted them successively one at a time. All mutants showed native cell-binding and catalytic activities, indicating that deletions specifically affected translocation activity. This step of the intoxication procedure was examined directly using a cell-free translocation assay, and indirectly by monitoring cytotoxicity. Translocation activity and log(cytotoxicity) were highly correlated, directly indicating that translocation is rate limiting for PE intoxication. Deletion of B, C and D helices resulted in non-toxic and non-translocating molecules, whereas mutants lacking the A or E helix displayed significant cytotoxicity albeit 500-fold lower than native PE. We concluded that B, C and D helices, which make up the core of domain II, are essential, whereas the more peripheral A and E helices are comparatively dispensable. The last helix (F) is inhibitory for translocation because its deletion produced a mutant displaying a translocation activity 60% higher than PE, along with a three- to sixfold increase in cytotoxicity in all tested cell lines. This toxin is the most in vitro active PE mutant obtained until now. Finally, partial duplication of domain II did not give rise to a more actively translocated PE, but rather to a threefold less active molecule." @default.
• W2021951566 created "2016-06-24" @default.
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• W2021951566 date "1999-03-01" @default.
• W2021951566 modified "2023-09-27" @default.
• W2021951566 title "A deletion within the translocation domain of Pseudomonas exotoxin A enhances translocation efficiency and cytotoxicity concomitantly" @default.
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• W2021951566 doi "https://doi.org/10.1046/j.1365-2958.1999.01280.x" @default.
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