Abstract
VIP36 is a protein described as an L-type lectin in animals, responsible for the intracellular transport of glycoproteins within the secretory pathway, and also localized on the plasma membrane. Schistosoma mansoni has a complex system of vesicles and protein transport machinery to the cell surface. The excreted/secreted products of the larvae and eggs are known to be exposed to the host immune system. Hence, characterizing the role and action of SmVIP36 in the S. mansoni life cycle is important for a better understanding of the parasite-host relationship. To this purpose, we firstly performed in silico analysis. Analysis of SmVIP36 in silico revealed that it contains a lectin leg-like domain with a jellyroll fold as seen by its putative 3D tertiary structure. Additionally, it was also observed that its CRD contains calcium ion-binding amino acids, suggesting that the binding of SmVIP36 to glycoproteins is calcium-dependent. Finally, we observed that the SmVIP36 predicted amino acid sequence relative to its orthologs was conserved. However, phylogenetic analysis revealed that SmVIP36 follows species evolution, forming a further cluster with its definitive host Homo sapiens. Moreover, q-PCR analysis in the S. mansoni life cycle points to a significant increase in gene expression in the eggs, schistosomulae, and female adult stages. Similarly, protein expression increased in eggs, cercariae, schistosomulae, and adult worm stages. These results suggest that SmVIP36 might participate in the complex secretory activity within the egg envelope and tegument proteins, both important for the stages of the parasite that interact with the host.
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Acknowledgments
The authors acknowledge the Olinda Mara Brigato and Elenice Aparecida de Macedo for technical assistance. Additionally, we are grateful to Dr. Hélio Vannucchi for provision of the q-PCR platform and to Lívia Maria Cordeiro Simões Ambrósio for technical assistance.
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All experiments involving animals were authorized by the Animal Research Ethics Commission (CETEA) of the University of São Paulo (protocol number n° 078/2012) and complied with the ethical principles in animal research adopted by the Brazilian College of Animal Experimentation (COBEA). The study protocols were in accordance with internationally accepted principles concerning the care and use of laboratory animals.
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The authors are grateful to FAPESP for fellowships and financial support (Processes FAPESP: 2011/04081-0).
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Fig. S1
Predicted amino acid sequence of 308 amino acids of SmVIP36 highlighting lectin leg-like domain. The predicted amino acid sequence was analyzed by using the Pfam algorithm to identify the domain conserved in primary amino acid sequence. The lectin leg-like domain is underlined (GIF 119 kb)
Fig. S2
Transcript amplification of the 133 bp from the SmVIP36 gene and of the 70 bp from the endogenous control GAPDH gene. The primers were designed using the Primer3Plus program and validated by PCR. The samples were analyzed on a 1% agarose gel. 1—molecular weight of 100 bp DNA ladder (Invitrogen), 2—SmVIP36, 3—GAPDH (GIF 72 kb)
ESM 1
3D tertiary structure of SmVIP36 showing their hydrophobic cavities. The three hydrophobic cavities were found using the online software 3D-SURFER and are highlighted in green, blue, and red (MPG 1770 kb)
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Ornelas, A.M.d., de Paula, R.G., Morais, E.R. et al. Molecular characterization of transport lectin vesicular integral membrane protein 36 kDa (VIP36) in the life cycle of Schistosoma mansoni . Parasitol Res 116, 2765–2773 (2017). https://doi.org/10.1007/s00436-017-5587-7
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DOI: https://doi.org/10.1007/s00436-017-5587-7