Immunofluorescence. Air-dried thin films of ring (12 hpi), trophozoite (28 hpi) and schizont (44 hpi) stage parasites were fixed in 4% paraformaldehyde, permeabilized with 0.1% Triton X-100, blocked with 3% BSA in phosphate-buffered saline for 1h at RT, incubated with rat α-HA antibody (clone 3F10, 1:50, Roche) at 4oC overnight, and detected with Alexa488-conjugated goat α-rat antibody (1:1000, Invitrogen) for 1h at RT. For PfMAHRP1 co-staining, rabbit α-PfMAHRP1 was added at 1:500 and detected with Alexa555-conjugated goat -rabbit (1:1000, Invitrogen). Slides were mounted with Vectashield anti-fading media containing 4',6-diamidino-2-phenylindole (Vector Laboratories) for nuclear counterstaining. Images were acquired with 100x objectives using a Nikon E800 Microscope. The images were analyzed using ImageJ. PfRACK1 localizes diffusely within the parasite cytoplasm, but not overlapping with the nuclei. we do not observe any exported PfRACK1 in the host cell cytoplasm or in Maurer’s clefts (identified by staining with antibodies directed against PfMAHRP.

Blomqvist K, DiPetrillo C, Streva VA, Pine S, Dvorin JD. Receptor for Activated C-Kinase 1 (PfRACK1) is required for Plasmodium falciparum intra-erythrocytic proliferation. Mol Biochem Parasitol. 2016 Oct 9. pii: S0166-6851(16)30129-3.