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• W1571012244 abstract "The role of the receptor in the transport of diphtheria toxin (DT) to the cytosol was examined. A point-mutant form of DT, CRM 107 (CRM represents cross-reacting material), that has an 8,000-fold lower affinity for the DT receptor than native toxin was conjugated to transferrin and monoclonal antibodies specific for the cell-surface receptors T3 and Thy1. Conjugating the binding site-inactivated CRM 107 to new binding moieties reconstituted full toxicity, indistinguishable from native DT linked to the same ligand, indicating that the entry activity of the DT B chain can be fully separated from the receptor binding function. Like DT, the toxin conjugates exhibited a dose-dependent lag period before first-order inactivation of protein synthesis. Inactivation of the binding site of the toxin portion of the conjugate was found to have no effect on the kinetics of protein synthesis inactivation. The receptor used by the toxin determined the length of the lag period relative to the killing rate. Comparing the potency of CRM 107 conjugates with native DT, standardized for receptor occupancy, shows that new receptors can be as or more efficient than the DT receptor in transporting DT to the cytosol. The transferrin-CRM 107 conjugate, unlike native DT, was highly toxic to murine cells. All the data presented are consistent with a model that the DT receptor, other than initiating rapid internalization of the toxin to low pH compartments, is unnecessary for transport of the toxin to the cytosol and that membrane translocation activity is expressed by the DT B subunit independent of the receptor-binding site." @default.
• W1571012244 created "2016-06-24" @default.
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• W1571012244 date "1988-01-01" @default.
• W1571012244 modified "2023-10-18" @default.
• W1571012244 title "The role of the diphtheria toxin receptor in cytosol translocation." @default.
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• W1571012244 doi "https://doi.org/10.1016/s0021-9258(19)57299-4" @default.
• W1571012244 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3257214" @default.
• W1571012244 hasPublicationYear "1988" @default.
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