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Identification and preliminary characterization of a putative C-type lectin receptor-like protein in the T. cruzi tomato lectin endocytic-enriched proteome.
Microbiological Research 2017 December
Trypanosoma cruzi, the etiological agent of the Chagas' disease in Latin America undergoes a complex life cycle involving two hosts, a mammalian host and a reduviid insect vector (triatomine). In the insect midgut the parasite multiplies as epimastigote forms, which rely on endocytosis for their energy requirement. We recently showed that posttranslational modification of endocytic N-glycoproteins by tomato lectin (TL) binding-N-glycans is crucial for receptor-mediated endocytosis (RME) in epimastigote forms. In an attempt to characterize the endocytic proteome we used a TL affinity chromatography, which significantly enriched glycoproteins of the trypanosomal endocytic pathway. In addition to various lysosomal hydrolases, we found an endosomal C-type lectin-like protein, which displays some structural and topological characteristics of the mammalian lectin receptor superfamily. This lectin encoding a large transmembrane protein of around 375kDa contained three putative extracellular N-terminal C-type lectin domains (CTLD) and located inside the flagellar pocket (FP)/cytostome and endosomal compartments of the insect stage of the parasite and on the surface of the plasma membrane of intracellular amastigote parasites. Noteworthy, this endogenous lectin displayed similar sugar-binding specificity to that of TL and therefore could be important in either the N-glycan mediated endocytosis or parasite adhesion to host cells. We postulated that during the evolution of trypanosomatids, genes encoding lectin harboring 3 CTDLs represent an old acquisition present in free-living, monoxenic and heteroxenic trypanosomatids, which would have been secondarily lost in extracellular parasites from the T. brucei clade.
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