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Science beyond Barriers

abberior instruments

Cell Biology

2021
PloS Pathogens

Co-chaperone involvement in knob biogenesis implicates host-derived chaperones in malaria virulence

Authors:

Diehl, M., Weber, S., Cyrklaff, M., Sanchez, C. P., Beretta, C. A., Roling, L., ... & Przyborski, J. M.

Keywords:

Plasmodium falciparum, HSP40, HSP70, knobs, KAHRP, malaria, virulence, PfEMP1, co-chaperone, chaperone

Abstract:

The pathology associated with malaria infection is largely due to the ability of infected human erythrocytes to adhere to a number of receptors on endothelial cells within tissues and organs. This phenomenon is driven by the export of parasite-encoded proteins to the host cell, the exact function of many of which is still unknown. Here we inactivate the function of one of these exported proteins, PFA66, a member of the J-domain protein family. Although parasites lacking this protein were still able to grow in cell culture, we observed severe defects in normal host cell modification, including aberrant morphology of surface knobs, disrupted presentation of the cytoadherence molecule PfEMP1, and a total lack of cytoadherence, despite the presence of the knob associated protein KAHRP. Complementation assays demonstrate that an intact J-domain is required for recovery to a wild-type phenotype and suggest that PFA66 functions in concert with a HSP70 to carry out host cell modification. Strikingly, this HSP70 is likely to be of host origin.

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