Efficiency of immunotoxin cytotoxicity is modulated by the intracellular itinerary.
Pseudomonas exotoxin-based immunotoxins, including LMB-2 (antiTac(F(v))-PE38), are proposed to traffic to the trans-Golgi network (TGN) and move by a retrograde pathway to the endoplasmic reticulum, here where they undergo translocation to the cytoplasm, a step that is essential for cytotoxicity.The retrograde transport pathways used by LMB-2 are n