Abstract
A novel dynamin-like GTPase gene, Pfdyn1, was cloned from an asexual stage cDNA library of Plasmodium falciparum Dd2 strain. Pfdyn1 contains a highly conserved N-terminal tripartite GTPase domain, a coiled-coil region, and a C-terminal 129 aa unknown function domain. Like yeast Vps1p, it lacks pleckstrin homology domain and proline-rich region. Western blot analysis showed that Pfdyn1 is a Triton X-100 insoluble protein expressed only in the mature sub-stage. Morphological studies indicated that Pfdyn1 is partly co-localized with PfGRP, a known ER-resident protein, and localizes diffusely with several membrane structures and a 60-100 nm vesicle both inside and on surface of the parasites and also in the cytoplasm of infected erythrocytes. The dsRNA originated by C-terminus fragment of Pfdyn1 inhibits markedly the growth of P. falciparum parasite at the erythrocyte stage. Those data showed that Pfdyn1 is a conservative, membrane related protein and plays an essential role for the survival of Plasmodium parasite.
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