Abstract
The plant toxin ricin binds to both glycoproteins and glycolipids with terminal galactose, and the toxin will therefore be endocytosed by the different mechanisms operating in a given cell. After endocytosis the toxin is transported to the Golgi apparatus by a process that differs from the Rab9-dependent transport of mannose-6-phosphate receptors. Retrograde toxin transport from the Golgi apparatus to the endoplasmic reticulum (ER) seems to be a requirement for subsequent toxin translocation to the cytosol where the toxin inhibits protein synthesis enzymatically. By using ricin we have characterized different types of endocytosis and the transport steps used by this toxin.
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