Endocytosis and site of entry of CNF1. Comparison
with others toxin. RT, ricin toxin; CT, cholera toxin; ST, Shiga toxin;
DT, diphtheria toxin; CNF1, cytotoxic necrotizing factor 1; ER,
endoplasmic reticulum; M, microtubules; ECV, endocytic carrier
vesicles; EE, early endosome; LE, late endosome; Ly, lysosome; Cl,
clathrin-coated invagination; C, caveolae invagination; NCC,
non-clathrin noncaveolae endocytic invagination; EF2, elongation factor
2; aGs, heterotrimeric GTP-binding protein a component; Rib, 28S
ribosome; Rho, Rho GTP-binding protein; TGN, trans-Golgi
network. Open arrows indicate sites where toxins are supposed to be
released into the cytosol. Boxed abbreviations indicate the
intracellular targets of toxins.