1. 20S proteasomes secreted by the malaria parasite promote its growth.
- Author
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Dekel E, Yaffe D, Rosenhek-Goldian I, Ben-Nissan G, Ofir-Birin Y, Morandi MI, Ziv T, Sisquella X, Pimentel MA, Nebl T, Kapp E, Ohana Daniel Y, Karam PA, Alfandari D, Rotkopf R, Malihi S, Temin TB, Mullick D, Revach OY, Rudik A, Gov NS, Azuri I, Porat Z, Bergamaschi G, Sorkin R, Wuite GJL, Avinoam O, Carvalho TG, Cohen SR, Sharon M, and Regev-Rudzki N
- Subjects
- Cytoskeleton metabolism, Erythrocytes cytology, Erythrocytes parasitology, Humans, Malaria, Falciparum parasitology, Membrane Proteins metabolism, Phosphorylation, Plasmodium falciparum growth & development, Proteomics, Biological Transport physiology, Erythrocytes metabolism, Host-Parasite Interactions physiology, Malaria, Falciparum metabolism, Plasmodium falciparum metabolism, Proteasome Endopeptidase Complex metabolism
- Abstract
Mature red blood cells (RBCs) lack internal organelles and canonical defense mechanisms, making them both a fascinating host cell, in general, and an intriguing choice for the deadly malaria parasite Plasmodium falciparum (Pf), in particular. Pf, while growing inside its natural host, the human RBC, secretes multipurpose extracellular vesicles (EVs), yet their influence on this essential host cell remains unknown. Here we demonstrate that Pf parasites, cultured in fresh human donor blood, secrete within such EVs assembled and functional 20S proteasome complexes (EV-20S). The EV-20S proteasomes modulate the mechanical properties of naïve human RBCs by remodeling their cytoskeletal network. Furthermore, we identify four degradation targets of the secreted 20S proteasome, the phosphorylated cytoskeletal proteins β-adducin, ankyrin-1, dematin and Epb4.1. Overall, our findings reveal a previously unknown 20S proteasome secretion mechanism employed by the human malaria parasite, which primes RBCs for parasite invasion by altering membrane stiffness, to facilitate malaria parasite growth.
- Published
- 2021
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