Plasmodium falciparum RH5–CyRPA–RIPR complex (RCR-complex)

The Plasmodium falciparum RH5–CyRPA–RIPR complex is an essential protein assembly involved in the invasion of human erythrocytes by malaria parasites. It consists of reticulocyte-binding protein homologue 5 (RH5), cysteine-rich protective antigen (CyRPA), and RH5-interacting protein (RIPR). This complex binds to the erythrocyte membrane via the basigin (CD147) receptor, an interaction crucial for parasite survival. RH5 directly engages basigin and is structurally supported by CyRPA and RIPR, which mediate assembly and membrane interactions. All components are highly conserved across P. falciparum strains and are indispensable for infection, making them high-priority blood-stage vaccine targets. Antibodies against any part of this complex can inhibit red blood cell invasion and have shown synergistic effects, justifying continued development of multi-component vaccine candidates. The complex is not associated with known safety liabilities but must overcome immunogenicity and efficacy challenges for successful clinical translation.

Other names

RH5–CyRPA–RIPR complexRH5 complexRCR-complexPlasmodium falciparum RH5 complexPfRH5–CyRPA–RIPR complex

Inhibitory antibodies bind to RH5, CyRPA, or RIPR proteins and block their interaction with the erythrocyte receptor basigin, thereby preventing merozoite invasion into red blood cells. Vaccine-induced antibodies neutralize the parasite during the blood-stage and prevent parasitemia.