Plasmodium falciparum thrombospondin-related anonymous protein (PfTRAP)

Plasmodium falciparum thrombospondin-related anonymous protein (PfTRAP) is a membrane-bound adhesive protein expressed on the surface of sporozoites and localized within micronemes. It is essential for the motility, host cell recognition, and infection of both mosquito vectors and mammalian hepatocytes. Structurally, PfTRAP contains an N-terminal von Willebrand factor A (vWA)-like domain, a thrombospondin type-1 repeat (TSR) domain, a proline-rich region, a transmembrane domain, and a cytoplasmic tail. The adhesive domains are responsible for binding to sulfated glycoconjugates on hepatocytes and playing a direct role in host cell entry. TRAP also interacts with host cell kinases, undergoing phosphorylation, which may facilitate cell signaling during invasion. The protein is critical for the life cycle of P. falciparum and is considered a leading vaccine and drug target for malaria[1][3][4][5][7][9][10]. *Note: The phrase “fused multiple epitope string” indicates this might refer to a vaccine immunogen design rather than a natural protein in the parasite. The canonical target is PfTRAP; artificial constructs should be separately classified as vaccine candidates, not innate parasite targets.*

Other names

Thrombospondin-related adhesive proteinTRAPSSP2 (sporozoite surface protein 2)

Inhibition of parasite–host cell interaction by blocking TRAP’s binding to sulfated glycoconjugates (e.g., suramin). Blockage of adhesive domains prevents sporozoite invasion of hepatocytes. Neutralizing antibodies (e.g., anti-TRAP monoclonal antibodies) block TRAP function and prevent hepatocyte infection.