Merozoite surface protein 3 of Plasmodium falciparum (MSP3)

Merozoite surface protein 3 (MSP3) of Plasmodium falciparum is an approximately 40 kDa secreted protein found on the surface of merozoites, playing a critical role during the erythrocytic stage of malaria infection. Unlike many other merozoite surface proteins, MSP3 does not possess a glycosylphosphatidylinositol (GPI) anchor or transmembrane domain, and is retained on the parasite surface via protein-protein interactions within an MSP1-MSP6-MSP7 complex. MSP3 forms elongated amyloid-like oligomers that can bind numerous heme molecules, suggesting a protective role against heme toxicity released during red blood cell lysis. Functionally, MSP3 is highly immunogenic—eliciting strong antibody responses both naturally and via immunization, which can mediate parasite inhibition and are being explored for malaria vaccine design. Although MSP3 itself is not an enzymatic drug target or small molecule receptor, its surface exposure and antigenicity render it a valuable therapeutic target for immune-based interventions.

Other names

MSP3PfMSP3

Antibody-mediated inhibition: Induction of antibodies against MSP3 can promote opsonic phagocytosis and directly inhibit parasite growth, via recognition of MSP3 epitopes on the merozoite surface leading to clearance Vaccine-induced immunity: Immunization with MSP3 antigens stimulates protective responses that suppress parasitemia