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Open Access Research article

Structural modelling and comparative analysis of homologous, analogous and specific proteins from Trypanosoma cruzi versus Homo sapiens: putative drug targets for chagas' disease treatment

Priscila VSZ Capriles1*, Ana CR Guimarães2*, Thomas D Otto23, Antonio B Miranda4, Laurent E Dardenne1 and Wim M Degrave2

Author Affiliations

1 Grupo de Modelagem Molecular de Sistemas Biológicos, Laboratório Nacional de Computação Científica, LNCC/MCT, Petrópolis, CEP 25651-075, Brazil

2 Laboratório de Genômica Funcional e Bioinformática, Instituto Oswaldo Cruz, IOC/FIOCRUZ, Rio de Janeiro, CEP 21045-900, Brazil

3 Parasite Genomics, Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Cambridge, CB10 1SA, UK

4 Laboratório de Biologia Computacional e Sistemas, Instituto Oswaldo Cruz, IOC/FIOCRUZ, Rio de Janeiro, CEP 21045-900, Brazil

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BMC Genomics 2010, 11:610  doi:10.1186/1471-2164-11-610

Published: 29 October 2010

Abstract

Background

Trypanosoma cruzi is the etiological agent of Chagas' disease, an endemic infection that causes thousands of deaths every year in Latin America. Therapeutic options remain inefficient, demanding the search for new drugs and/or new molecular targets. Such efforts can focus on proteins that are specific to the parasite, but analogous enzymes and enzymes with a three-dimensional (3D) structure sufficiently different from the corresponding host proteins may represent equally interesting targets. In order to find these targets we used the workflows MHOLline and AnEnΠ obtaining 3D models from homologous, analogous and specific proteins of Trypanosoma cruzi versus Homo sapiens.

Results

We applied genome wide comparative modelling techniques to obtain 3D models for 3,286 predicted proteins of T. cruzi. In combination with comparative genome analysis to Homo sapiens, we were able to identify a subset of 397 enzyme sequences, of which 356 are homologous, 3 analogous and 38 specific to the parasite.

Conclusions

In this work, we present a set of 397 enzyme models of T. cruzi that can constitute potential structure-based drug targets to be investigated for the development of new strategies to fight Chagas' disease. The strategies presented here support the concept of structural analysis in conjunction with protein functional analysis as an interesting computational methodology to detect potential targets for structure-based rational drug design. For example, 2,4-dienoyl-CoA reductase (EC 1.3.1.34) and triacylglycerol lipase (EC 3.1.1.3), classified as analogous proteins in relation to H. sapiens enzymes, were identified as new potential molecular targets.