The gp82 Surface Molecule of Trypanosoma cruzi Metacyclic Forms

  • Cristian Cortez
  • Tiago J. P. Sobreira
  • Fernando Y. Maeda
  • Nobuko Yoshida
Part of the Subcellular Biochemistry book series (SCBI, volume 74)


Gp82 is a surface glycoprotein expressed in Trypanosoma cruzi metacyclic trypomastigotes, the parasite forms from the insect vector that initiate infection in the mammalian host. Studies with metacyclic forms generated in vitro, as counterparts of insect-borne parasites, have shown that gp82 plays an essential role in host cell invasion and in the establishment of infection by the oral route. Among the gp82 properties relevant for infection are the gastric mucin-binding capacity and the ability to induce the target cell signaling cascades that result in actin cytoskeleton disruption and lysosome exocytosis, events that facilitate parasite internalization. The gp82 sequences from genetically divergent T. cruzi strains are highly conserved, displaying >90 % identity. Both the host cell-binding sites, as well as the gastric mucin-binding sequence of gp82, are localized in the C-terminal domain of the molecule. In the gp82 structure model, the main cell-binding site consists of an α-helix, which connects the N-terminal β-propeller domain to the C-terminal β-sandwich domain, where the second cell binding site is nested. The two cell binding sites are fully exposed on gp82 surface. Downstream and close to the α-helix is the gp82 gastric mucin-binding site, which is partially exposed. All available data support the notion that gp82 is structurally suited for metacyclic trypomastigote invasion of host cells and for initiating infection by the oral route.


Gastric Mucin Host Cell Invasion Gp82 Sequence Metacyclic Trypomastigotes Metacyclic Form 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



Acute Chagas’ disease




Enteroinvasive Escherichia coli


Glutathione S transferase


Inositol 1,4,5-triphosphate


Metacyclic trypomastigotes


Mammalian target of rapamycin


Phosphatidylinositol 3-kinase


Protein tyrosine kinase


Tissue culture trypomastigotes


Protein kinase C


Phospholipase C



 Work supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional de Desenvolvimento Cientfico e Tecnológico (CNPq).


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Cristian Cortez
    • 1
  • Tiago J. P. Sobreira
    • 2
  • Fernando Y. Maeda
    • 1
  • Nobuko Yoshida
    • 1
  1. 1.Departamento de Microbiologia, Imunologia e Parasitologia, Escola Paulista de MedicinaUniversidade Federal de São PauloSão PauloBrazil
  2. 2.Laboratório Nacional de BiociênciasCentro Nacional de Pesquisa em Energia e MateriaisCampinasBrazil

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