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Endosomal ricin transport: involvement of Rab4- and Rab5-positive compartments
Authors:Mihail?Moisenovich  Alex?Tonevitsky  Natalia?Maljuchenko  Natalia?Kozlovskaya  Igor?Agapov  Walter?Volknandt  Email author" target="_blank">Jürgen?Bereiter-HahnEmail author
Institution:(1) Institute of Zoology, Biocentre, Johann Wolfgang Goethe University, Marie Curie Strasse 9, 60439 Frankfurt am Main, Germany;(2) Biological Faculty, Lomonosov Moscow State University, Vorobjovi gory, 119992 Moscow, Russia
Abstract:Transport of the ribosome-inactivating protein ricin through endosomes was studied in A431 cells expressing Rab5-, Rab4-, and Rab11-GFP. It was shown that Rab5- and Rab4-positive functional domains of early endosomes are involved in ricin transport. Ricin enters cells by both clathrin-dependent and clathrin-independent mechanisms. The main pool of internalized toxin accumulates in early endosomes and remains associated with them for a long time. In contrast to earlier observations, current observations indicate that the majority of ricin avoids transport to lysosomes. The low level of ricin association with Rab11 as well as with transferrin accumulated in the pericentriolar recycling compartment shows that the compartment is not responsible for keeping ricin away from degradation in lysosomes. Escape from degradation in lysosomes is assumed to result from the potentiality of ricin to form assemblies within compartments.
Keywords:Endocytosis  Ricin  Transferrin  Recycling  Rab proteins  Lysosome
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