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Distribution and Processing of Eimeria nieschulzi OWP13, a New Protein of the COWP Family.
Journal of Eukaryotic Microbiology 2018 July
Eimeria species are important veterinary coccidian parasites and are transmitted between hosts via oocysts. The infectious sporozoites are protected by the oocyst and sporocyst wall. Tyrosine-rich proteins are well-known components of the Eimeria oocyst wall. Recently, cysteine motif containing proteins (COWP family), as described in Toxoplasma gondii and Cryptosporidium spp., have also been characterized in Eimeria. Here, we identified a novel COWP-related protein, EnOWP13, and tracked it via transfection technology in Eimeria nieschulzi. The subsequent analysis suggests that the mCherry-tagged EnOWP13 localizes to the wall-forming bodies I and the outer wall. Immunohistochemical analysis confirmed the distribution of wall-forming bodies similar to avian Eimeria species and revealed that the wall-forming bodies I show peroxidase activity. The EnOWP13 amino acid composition and FITC-cadaverine-positive wall-forming bodies I suggest a participation of an enzyme with transglutaminase activity. This is the first description and characterization of this novel outer oocyst wall protein, which is also orthologous to other Eimeria species and Toxoplasma gondii, suggesting a new potential cross-linking mechanism of wall-forming proteins via isopeptide bonds.
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