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Malaria is a devastating disease caused by apicomplexan parasites of the genus Plasmodium that use a divergent actin-powered molecular motor for motility and invasion. Plasmodium actin differs from canonical actins in sequence, structure and function. Here, the purification, crystallization and secondary-structure analysis of the two Plasmodium actin isoforms are presented. The recombinant parasite actins were folded and could be purified to homogeneity. Plasmodium actins I and II were crystallized in complex with the gelsolin G1 domain; the crystals diffracted to resolutions of 1.19 and 2.2 Å and belonged to space groups P212121 and P21, respectively, each with one complex in the asymmetric unit.

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