The 37-kDa C-terminal fragment of Pseudomonas exotoxin A (PE; termed PE37 and composed of aa 280-613 of PE) translocates to the cell cytosol to cause cell death. PE37 requires a C-terminal endoplasmic reticulum retention sequence to be cytotoxic, indicating that the toxin may translocate to the cytosol from the endoplasmic reticulum. We show here that the N-terminal region of nascent PE37 can be inserted into the membrane of canine pancreatic microsomes by the preprocecropin signal sequence but then is exported or released from microsomes. The 34 N-terminal amino acids of the toxin fragment are sufficient to arrest translocation and prevent the microsomal accumulation of nascent chains that otherwise are sequestered into microsomes. These data support a role for the N-terminal region of PE37 in the translocation of the toxin from the endoplasmic reticulum to the cytosol in mammalian cells.
Theuer, C. P., Buchner, J., FitzGerald, D., & Pastan, I. (1993). The N-terminal region of the 37-kDa translocated fragment of Pseudomonas exotoxin A aborts translocation by promoting its own export after microsomal membrane insertion. Proceedings of the National Academy of Sciences of the United States of America, 90(16), 7774–7778. https://doi.org/10.1073/pnas.90.16.7774