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. 1992 Oct 15;89(20):9647–9651. doi: 10.1073/pnas.89.20.9647

Plasmodium chabaudi p68 serine protease activity required for merozoite entry into mouse erythrocytes.

C B Breton 1, T Blisnick 1, H Jouin 1, J C Barale 1, T Rabilloud 1, G Langsley 1, L H Pereira da Silva 1
PMCID: PMC50189  PMID: 1409678

Abstract

To define the role of malaria parasite enzymes during the process of erythrocyte invasion, we have developed an in vitro serum-free invasion assay of mouse erythrocytes by purified Plasmodium chabaudi merozoites. The sensitivity of a merozoite-specific serine protease (p68) to various inhibitors and the effect of these inhibitors on invasion indicate a crucial role for p68. The substrate specificity of the purified enzyme has been partially defined using fluorogenic peptides. Consistent with this, in vitro incubation of mouse erythrocytes with the merozoite enzyme led to the cleavage of band 3 protein. The possible implication of erythrocyte band 3 truncation for the successful entry of the merozoite into the erythrocyte is discussed.

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Selected References

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