Knob-associated histidine-rich protein (KAHRP) (KAHRP)

Knob-associated histidine-rich protein (KAHRP) is a key virulence factor exported by the malaria parasite Plasmodium falciparum into the host erythrocyte (UniProt: P05227). Its primary biological function is to orchestrate the formation of 'knobs,' which are specialized nanostructures on the red blood cell membrane that serve as anchors for the adhesion protein PfEMP1 (PubMed: 25664561). By binding to host cytoskeletal components like spectrin and actin, KAHRP facilitates the structural remodeling of the host cell, increasing its rigidity and enabling cytoadherence to the vascular endothelium (PubMed: 10648675). This process of sequestration allows the parasite to avoid clearance by the spleen and is a central driver of severe malaria complications, such as cerebral malaria (PubMed: 30104374). Although no drugs targeting KAHRP are currently in clinical use, it is a significant target for research into anti-sequestration therapies and vaccines (PubMed: 28438916). Potential therapeutic strategies involve using small molecules or peptides to disrupt KAHRP's interaction with the host cytoskeleton, thereby preventing knob assembly and reducing parasite burden. The protein's essential role in pathogenesis makes it a high-priority candidate for interventions aimed at mitigating the severity of P. falciparum infections.

Other names

Histidine-rich protein 1HRP1HRP-IPF3D7_0202000

Inhibition of knob formation and parasite cytoadherence to vascular endothelium