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Many protozoans of the phylum Apicomplexa are invasive parasites that exhibit a substrate-dependent gliding motility. Plasmodium (malaria) sporozoites, the stage of the parasite that invades the salivary glands of the mosquito vector and the liver of the vertebrate host, express a surface protein called thrombospondin-related anonymous protein (TRAP) that has homologs in other Apicomplexa. By gene targeting in a rodent Plasmodium, we demonstrate that TRAP is critical for sporozoite infection of the mosquito salivary glands and the rat liver, and is essential for sporozoite gliding motility in vitro. This suggests that in Plasmodium sporozoites, and likely in other Apicomplexa, gliding locomotion and cell invasion have a common molecular basis.

Type

Journal article

Journal

Cell

Publication Date

08/08/1997

Volume

90

Pages

511 - 522

Keywords

Animals, Anopheles, Cloning, Molecular, Digestive System, Erythrocytes, Genes, Protozoan, Liver, Movement, Plasmodium berghei, Polymerase Chain Reaction, Protozoan Proteins, Rats, Recombinant Proteins, Salivary Glands, Spores