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                <term xml:lang="en">Basal bodies</term>
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              <p>Centrins are cytoskeletal proteins associated with the centrosomes or basal bodies in the eukaryotes. We previously reported the involvement of Centrin 1-3 proteins in cell division in the protozoan parasites Leishmania donovani and Trypanosoma brucei. Centrin4 and 5, unique to such parasites, had never been characterized in Leishmania parasite. In the current study, we addressed the function of centrin4 (LdCen4) in Leishmania. By dominant-negative study, the episomal expression of C-terminal truncated LdCen4 in the parasite reduced the parasite growth. LdCen4 double allele gene deletion by either homologous recombination or CRISPR-Cas9 was not successful in L. donovani. However, CRISPR-Cas9-based deletion of the homologous gene was possible in L. mexicana, which attenuated the parasite growth in vitro, but not ex vivo in the macrophages. LdCen4 also interacts with endogenous and overexpressed LdPOC protein, a homolog of centrin reacting human POC (protein of centriole) in a calcium sensitive manner. LdCen4 and LdPOC binding has also been confirmed through in silico analysis by protein structural docking and validated by co-immunoprecipitation. By immunofluorescence studies, we found that both the proteins share a common localization at the basal bodies. Thus, for the first time, this article describes novel centrin4 and its binding protein in the protozoan parasites.</p>
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  </text>
</TEI>