Plasmodium falciparum Endoplasmic Reticulum Protein Folding and Trafficking Machinery

The Plasmodium falciparum Endoplasmic Reticulum (ER) protein folding and trafficking machinery is a complex network of chaperones and transporters essential for the parasite's survival and virulence (Külzer et al., 2012, PMID: 22438784). Key components include the Hsp70-family chaperone PfBiP and PfHsp90, which ensure correct protein folding, and the Sec61 translocon, which facilitates protein entry into the ER (Heiber et al., 2013, PMID: 23413034). This machinery is particularly vital for the export of hundreds of effector proteins into the host erythrocyte, a process necessary for host cell remodeling and immune evasion (Elsworth et al., 2014, PMID: 25043010). Disruption of these processes by inhibitors like 17-AAG or Brefeldin A triggers severe ER stress and the Unfolded Protein Response (UPR), leading to parasite growth arrest (Chaubey et al., 2014, PMID: 24634458). Because the parasite undergoes rapid multiplication and extensive protein synthesis during its intraerythrocytic cycle, it is highly sensitive to disruptions in ER proteostasis (Bridgford et al., 2018, PMID: 30104376). Targeting this machinery induces the accumulation of misfolded proteins, which is lethal to the parasite across multiple life stages (Promeneur et al., 2007, PMID: 17502371). Despite its potential as a drug target, the high structural similarity between Plasmodium and human ER chaperones poses a significant risk of host toxicity (Banumathy et al., 2003, PMID: 12804512).

Other names

Plasmodium ER proteostasis networkMalaria ER protein quality control systemPlasmodium ER-associated degradation (ERAD) pathwayPfER-PFTM

Inhibition of molecular chaperones (e.g., Hsp70, Hsp90) or translocons (e.g., Sec61) to disrupt protein folding and transport, leading to lethal ER stress and proteotoxicity.