Mechanisms of Host Erythrocyte Remodeling by Plasmodium falciparum

Plasmodium falciparum invades human erythrocytes and orchestrates extensive structural and functional remodelling of the host cell to ensure its own survival, replication and transmission. Soon after invasion, the parasite exports a cascade of effector proteins across the parasitophorous vacuole membrane into the erythrocyte cytosol. Some of these effectors, including members of the PHIST family and the knob-associated histidine-rich protein (KAHRP), target and bind components of the spectrin–actin network, reshaping the cytoskeleton and altering membrane rigidity. Concomitantly, parasite-derived adhesins such as Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) are trafficked to knob structures on the erythrocyte surface, where their presentation underpins cytoadherence to vascular endothelium and immune evasion. At a molecular level, signalling pathways involving parasite phosphatidylinositol 3-kinase and host ubiquitin–proteasome systems modulate the selective degradation of spectrin subunits, fine-tuning the mechanical properties of the infected cell. These combined alterations facilitate nutrient uptake, avoid splenic clearance and contribute to the pathogenesis of severe malaria by promoting microvascular sequestration and vascular obstruction.

Research from Nature Portfolio

Recent advances in live-cell imaging have enabled unprecedented insights into the dynamic processes of host-cell remodelling. A continuous, single-cell three-dimensional imaging workflow has been developed, integrating label-free differential interference contrast with fluorescence microscopy and deep-learning segmentation to visualise the spatiotemporal export of KAHRP and its clustering beneath the erythrocyte membrane throughout the 48-hour intraerythrocytic cycle. Complementing this, single-molecule super-resolution microscopy has quantified the number and nanoscale distribution of PfEMP1 adhesins on individual knob structures, revealing that only a handful of adhesin molecules localise predominantly at knob tips, a finding with implications for the force and specificity of cytoadhesion. Furthermore, molecular studies of the KAHRP–PfEMP1 interaction have elucidated positively charged linear motifs on KAHRP that form a dynamic, electrostatically driven complex with the cytoplasmic domain of PfEMP1, shedding light on the molecular architecture of cytoadherent knobs.

Mechanisms of Host Erythrocyte Remodeling by Plasmodium falciparum publication trend

The graph below shows the total number of articles in mechanisms of host erythrocyte remodeling by plasmodium falciparum across all publications each year (not limited to Nature Index journals).

Technical terms

Erythrocyte remodelling: The process by which P. falciparum alters the red blood cell’s membrane and cytoskeleton to facilitate parasite survival.

Knobs: Nanoscopic protrusions on the surface of infected erythrocytes composed of parasite proteins that present adhesive ligands.

PfEMP1: A major parasite-derived adhesion molecule exported to the erythrocyte surface, mediating cytoadherence to endothelial receptors.

KAHRP: Knob-associated histidine-rich protein that directs knob assembly through interactions with the erythrocyte spectrin network.

Spectrin: A structural protein forming a flexible network beneath the erythrocyte membrane, targeted and remodelled by parasite effectors.

Ubiquitination: A post-translational modification where ubiquitin is attached to a protein, marking it for proteasomal degradation.

References

1. Deep learning image analysis for continuous single-cell imaging of dynamic processes in Plasmodium falciparum-infected erythrocytes. Communications Biology (2025).
2. Plasmodium falciparum selectively degrades α-spectrin of infected erythrocytes after invasion. mBio (2024).
3. Single-molecule imaging and quantification of the immune-variant adhesin VAR2CSA on knobs of Plasmodium falciparum-infected erythrocytes. Communications Biology (2019).
4. Structural analysis of P. falciparum KAHRP and PfEMP1 complexes with host erythrocyte spectrin suggests a model for cytoadherent knob protrusions. PLOS Pathogens (2017).
5. Structural and Functional Studies of Interaction between Plasmodium falciparum Knob-associated Histidine-rich Protein (KAHRP) and Erythrocyte Spectrin*. Journal of Biological Chemistry (2005).
6. A member of the Plasmodium falciparum PHIST family binds to the erythrocyte cytoskeleton component band 4.1. Malaria Journal (2013).
7. Mapping the Binding Domains Involved in the Interaction between the Plasmodium falciparum Knob-associated Histidine-rich Protein (KAHRP) and the Cytoadherence Ligand P. falciparum Erythrocyte Membrane Protein 1 (PfEMP1)*. Journal of Biological Chemistry (1999).