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- W2939914575 abstract "Abstract The endoplasmic reticulum (ER) is thought to play an essential role during egress of malaria parasites because the ER is assumed to be the calcium (Ca 2+ ) signaling hub and required for biogenesis of egress-related organelles. However, no proteins localized to the parasite ER have been shown to play a role in egress of malaria parasites. In this study, we generated conditional mutants of the Plasmodium falciparum E ndoplasmic R eticulum-resident C alcium-binding protein (PfERC), a member of the CREC family. Knockdown of PfERC shows that this gene is essential for asexual growth of P. falciparum . Analysis of the intraerythrocytic lifecycle revealed that PfERC is essential for parasite egress but not required for protein trafficking or Ca 2+ storage. We found that PfERC knockdown prevents the rupture of the parasitophorous vacuole membrane. This is because PfERC knockdown inhibited the proteolytic maturation of the subtilisin-like serine protease, SUB1. Using double mutant parasites, we show that PfERC is required for the proteolytic maturation of the essential aspartic protease, Plasmepsin X, which cleaves SUB1. Further, we show that processing of substrates downstream of the proteolytic cascade is inhibited by PfERC knockdown. Thus, these data establish the ER-resident CREC family protein, PfERC, as a key early regulator of the egress proteolytic cascade of malaria parasites." @default.
- W2939914575 created "2019-04-25" @default.
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- W2939914575 date "2018-10-31" @default.
- W2939914575 modified "2023-10-06" @default.
- W2939914575 title "An ER CREC family protein regulates the egress proteolytic cascade in malaria parasites" @default.
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- W2939914575 doi "https://doi.org/10.1101/457481" @default.
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