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Proteins on the surface of the malaria parasite and cell invasion

Published online by Cambridge University Press:  06 April 2009

A. A. Holder
A. A. Holder
Affiliation:
Division of Parasitology, National Institute for Medical Research, Mill Hill, London NW7 1AA, UK
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Summary

The malaria parasite exists in an extracellular form at several stages in its life cycle. Within the vertebrate host, sporozoites and merozoites have to invade specific cell types. Proteins on the surface of the parasite or externalized from specialized organelles have been implicated as ligands for receptors on the host cell surface. Direct binding studies have identified parasite proteins that interact with the target cell surface. Examination of the deduced amino acid sequences has allowed the identification of primary structural motifs which may have roles in this process. On the sporozoite, the circum-sporozoite protein and sporozoite surface protein-2, a protein initially located within micronemes, have been found to contain an amino acid sequence thought to be involved in mediating recognition of sulphated polysaccharides on the surface of a liver cell. On the merozoite, merozoite surface protein-1 may be involved in the initial recognition of red blood cells; this protein undergoes a complex series of modifications in the time between its synthesis as a precursor molecule and successful erythrocyte invasion. Other merozoite proteins located at the apical end of the parasite have been identified as erythrocyte or reticulocyte binding proteins.

Keywords

malariaPlasmodiuminvasion
Type
Research Article
Information
Parasitology , Volume 108 , supplement S1: Symposia of the British Society for Parasitology Volume 31:Functional molecules on the surface of protozoan parasites , March 1994 , pp. S5 - S18
Copyright
Copyright © Cambridge University Press 1994

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