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Open Access Highly Accessed Research article

Dengue-2 Structural Proteins Associate with Human Proteins to Produce a Coagulation and Innate Immune Response Biased Interactome

Brenda B Folly1, Almeriane M Weffort-Santos2, CG Fathman3 and Luis RB Soares34*

Author Affiliations

1 Federal University of Paraná, Pharmaceutical Sciences Post-graduation Program, Av. Pref. Lothário Meissner 632, CEP 80210-170, Curitiba-PR, Brazil

2 Federal University of Paraná, Medical Pathology Department, Av. Pref. Lothario Meissner 632, CEP 80210-170, Curitiba-PR, Brazil

3 Stanford University School of Medicine, Department of Medicine, Division of Immunology & Rheumatology, CCSR Building, 269 Campus Drive, Room 2225 Stanford, CA 94305-5166, USA

4 Instituto Pelé Pequeno Príncipe, Hospital Pequeno Príncipe, Av. Silva Jardim, 1632 - Curitiba - PR - CEP 80250-060, Brazil

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BMC Infectious Diseases 2011, 11:34  doi:10.1186/1471-2334-11-34

Published: 31 January 2011

Abstract

Background

Dengue virus infection is a public health threat to hundreds of millions of individuals in the tropical regions of the globe. Although Dengue infection usually manifests itself in its mildest, though often debilitating clinical form, dengue fever, life-threatening complications commonly arise in the form of hemorrhagic shock and encephalitis. The etiological basis for the virus-induced pathology in general, and the different clinical manifestations in particular, are not well understood. We reasoned that a detailed knowledge of the global biological processes affected by virus entry into a cell might help shed new light on this long-standing problem.

Methods

A bacterial two-hybrid screen using DENV2 structural proteins as bait was performed, and the results were used to feed a manually curated, global dengue-human protein interaction network. Gene ontology and pathway enrichment, along with network topology and microarray meta-analysis, were used to generate hypothesis regarding dengue disease biology.

Results

Combining bioinformatic tools with two-hybrid technology, we screened human cDNA libraries to catalogue proteins physically interacting with the DENV2 virus structural proteins, Env, cap and PrM. We identified 31 interacting human proteins representing distinct biological processes that are closely related to the major clinical diagnostic feature of dengue infection: haemostatic imbalance. In addition, we found dengue-binding human proteins involved with additional key aspects, previously described as fundamental for virus entry into cells and the innate immune response to infection. Construction of a DENV2-human global protein interaction network revealed interesting biological properties suggested by simple network topology analysis.

Conclusions

Our experimental strategy revealed that dengue structural proteins interact with human protein targets involved in the maintenance of blood coagulation and innate anti-viral response processes, and predicts that the interaction of dengue proteins with a proposed human protein interaction network produces a modified biological outcome that may be behind the hallmark pathologies of dengue infection.