The P. falciparum artemisinin resistance determinant K13 localizes to the parasite ER and intracellular vesicles. Representative

immunoelectron microscopy (IEM) images depicting K13 localization in NF54WTattB-GFP-K13WT or NF54WTattB-3HA-K13C580Y parasites stained with 18 nm colloidal gold-conjugated anti-GFP or anti-HA antibodies. Arrowheads highlight locations of interest. ER, endoplasmic reticulum; Hz, hemozoin; N, nucleus; PVM, parasitophorous vacuolar membrane. Scale bars: 100 nm. K13 was also frequently associated with the ER itself, as well as with the plasma and nuclear membranes and the DV. We also saw evidence of K13 associating with cytostomes that traffic host-endocytosed hemoglobin from the parasitophorous vacuolar space to the DV.

Gnädig NF, Stokes BH, Edwards RL, Kalantarov GF, Heimsch KC, Kuderjavy M, Crane A, Lee MCS, Straimer J, Becker K, Trakht IN, Odom John AR, Mok S, Fidock DA. Insights into the intracellular localization, protein associations and artemisinin resistance properties of Plasmodium falciparum K13. PLoS Pathog. 2020 Apr 20;16(4):e1008482.