Artemisinin kills malaria parasites by damaging proteins and inhibiting the proteasome.

Abstract:

:Artemisinin and its derivatives (collectively referred to as ARTs) rapidly reduce the parasite burden in Plasmodium falciparum infections, and antimalarial control is highly dependent on ART combination therapies (ACTs). Decreased sensitivity to ARTs is emerging, making it critically important to understand the mechanism of action of ARTs. Here we demonstrate that dihydroartemisinin (DHA), the clinically relevant ART, kills parasites via a two-pronged mechanism, causing protein damage, and compromising parasite proteasome function. The consequent accumulation of proteasome substrates, i.e., unfolded/damaged and polyubiquitinated proteins, activates the ER stress response and underpins DHA-mediated killing. Specific inhibitors of the proteasome cause a similar build-up of polyubiquitinated proteins, leading to parasite killing. Blocking protein synthesis with a translation inhibitor or inhibiting the ubiquitin-activating enzyme, E1, reduces the level of damaged, polyubiquitinated proteins, alleviates the stress response, and dramatically antagonizes DHA activity.

journal_name

Nat Commun

journal_title

Nature communications

authors

Bridgford JL,Xie SC,Cobbold SA,Pasaje CFA,Herrmann S,Yang T,Gillett DL,Dick LR,Ralph SA,Dogovski C,Spillman NJ,Tilley L

doi

10.1038/s41467-018-06221-1

subject

Has Abstract

pub_date

2018-09-18 00:00:00

pages

3801

issue

1

issn

2041-1723

pii

10.1038/s41467-018-06221-1

journal_volume

9

pub_type

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