Apical membrane antigen 1 (Plasmodium falciparum) (AMA1)

Apical membrane antigen 1 (AMA1) is a critical type I transmembrane protein found in Plasmodium falciparum and other apicomplexan parasites [1.1.1]. It is primarily localized in the micronemes and later on the surface of merozoites, where it plays an essential role in the invasion of host erythrocytes by forming a "moving junction" through interaction with rhoptry neck proteins, specifically RON2 [1.1.4, 1.3.1]. AMA1 is also involved in the invasion of hepatocytes by sporozoites [1.2.1]. Due to its indispensable role in the parasite life cycle, it has been a primary target for blood-stage malaria vaccines [1.3.4, 1.4.4]. However, the protein's ectodomain is highly polymorphic, particularly in Domain I, which allows the parasite to evade host immune responses and presents a significant challenge for developing a vaccine that provides broad, strain-transcending protection [1.2.2, 1.2.4]. Therapeutic strategies include recombinant protein vaccines, viral vector-based vaccines, and inhibitory peptides designed to block the AMA1-RON2 interaction [1.1.4, 1.3.5, 1.4.2].

Other names

PfAMA1AMA-1Apical membrane antigen 1PK66 (homolog)Merozoite surface antigen (in some contexts)

Inhibition of host cell invasion by blocking the formation of the moving junction, specifically the interaction between the AMA1 ectodomain and RON2 [1.1.4, 1.3.5].