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Updated: Mar 26, 2026
Author Spotlight: Identifying Compensatory Pathways in Malaria Parasites Containing Hypomorphic Allele of Essential Protein Kinases
Published on: November 22, 2024
Quantitative phospho-proteomics reveals the Plasmodium merozoite triggers pre-invasion host kinase modification of
Elizabeth S Zuccala1,2, Timothy J Satchwell3, Fiona Angrisano1,2
1Division of Infection and Immunity, Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria, Australia.
Abstract:
The invasive blood-stage malaria parasite - the merozoite - induces rapid morphological changes to the target erythrocyte during entry. However, evidence for active molecular changes in the host cell that accompany merozoite invasion is lacking. Here, we use invasion inhibition assays, erythrocyte resealing and high-definition imaging to explore red cell responses during invasion. We show that although merozoite entry does not involve erythrocyte actin reorganisation, it does require ATP to complete the process. Towards dissecting the ATP requirement, we present an in depth quantitative phospho-proteomic analysis of the erythrocyte during each stage of invasion. Specifically, we demonstrate extensive increased phosphorylation of erythrocyte proteins on merozoite attachment, including modification of the cytoskeletal proteins beta-spectrin and PIEZO1. The association with merozoite contact but not active entry demonstrates that parasite-dependent phosphorylation is mediated by host-cell kinase activity. This provides the first evidence that the erythrocyte is stimulated to respond to early invasion events through molecular changes in its membrane architecture.
Insights
Malaria parasites (merozoites) trigger host red blood cell (erythrocyte) molecular changes during invasion. This involves increased protein phosphorylation, indicating an active host cell response to malaria parasite entry.
Area of Science:
- Cell Biology
- Parasitology
- Biochemistry
Background:
- The malaria parasite's blood stage involves merozoite invasion of erythrocytes.
- Little is known about active molecular changes within the host erythrocyte during merozoite invasion.
Purpose of the Study:
- To investigate host erythrocyte molecular responses during merozoite invasion.
- To identify specific molecular events and host cell kinases involved in erythrocyte invasion by malaria parasites.
Main Methods:
- Invasion inhibition assays and high-definition imaging were employed.
- Erythrocyte resealing experiments were conducted.
- Quantitative phosphoproteomic analysis of erythrocytes during invasion stages was performed.
Main Results:
- Merozoite entry requires ATP but not erythrocyte actin reorganization.
- Significant increases in erythrocyte protein phosphorylation were observed upon merozoite attachment.
- Key cytoskeletal proteins, including beta-spectrin and PIEZO1, were modified.
- Phosphorylation is mediated by host-cell kinase activity, independent of active parasite entry.
Conclusions:
- The erythrocyte actively responds to merozoite attachment through host-cell kinase-mediated phosphorylation.
- This study provides the first evidence of molecular changes in erythrocyte membrane architecture during early malaria parasite invasion events.
