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Thermodynamic stability of domain III from the envelope protein of flaviviruses and its improvement by molecular design

TitoloThermodynamic stability of domain III from the envelope protein of flaviviruses and its improvement by molecular design
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2013
AutoriZidane, N., Dussart P., Bremand L., Villani Maria Elena, and Bedouelle H.
RivistaProtein Engineering, Design and Selection
Volume26
Paginazione389-399
ISSN17410126
Parole chiaveAmino Acid Sequence, Antibodies, antigenicity, Antigens, article, Cell membranes, Chemical properties, consensus sequence, controlled study, Covalent bonds, cytoplasm, Dengue virus 3, disulfide bond, ED3 domain, envelope protein, Envelope proteins, Escherichia coli, Flavivirus, Flavivirus Infections, genotype, Humans, Models, Molecular, Molecular Sequence Data, mutation, nonhuman, priority journal, protein domain, protein engineering, protein stability, Protein Structure, protein unfolding, Proteins, Recombinant Proteins, Temperature, Thermodynamic stability, thermodynamics, Viral, Viral Envelope Proteins, virus envelope protein, Viruses
Abstract

The Flavivirus genus includes widespread and severe human pathogens like the four serotypes of dengue virus (DENV1 to DENV4), yellow fever virus, Japanese encephalitis virus and West Nile virus. Domain III (ED3) of the viral envelope protein interacts with cell receptors and contains epitopes recognized by virus neutralizing antibodies. Its structural, antigenic and immunogenic properties have been thoroughly studied contrary to its physico-chemical properties. Here, the ED3 domains of the above pathogenic flaviviruses were produced in the periplasm of Escherichia coli. Their thermodynamic stabilities were measured and compared in experiments of unfolding equilibriums, induced with chemicals or heat and monitored through protein fluorescence. A designed ED3 domain, with the consensus sequence of DENV strains from all serotypes, was highly stable. The low stability of the ED3 domain from DENV3 was increased by three changes of residues in the protein core without affecting its reactivity towards DENV-infected human serums. Additional changes showed that the stability of ED3 varied with the DENV3 genotype. The Tm of ED3 was higher than 69°C for all the tested viruses and reached 86°C for the consensus ED3. The latter, deprived of its disulfide bond by mutations, was predominantly unfolded at 20°C. These results will help better understand and design the properties of ED3 for its use as diagnostic, vaccine or therapeutic tools. © 2013 The Author.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84878055217&doi=10.1093%2fprotein%2fgzt010&partnerID=40&md5=b38330d06d2055b15b23d9194bf5b81b
DOI10.1093/protein/gzt010
Citation KeyZidane2013389