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High resolution crystal structure of dengue-3 envelope protein domain III suggests possible molecular mechanisms for
Montasir Elahi1, Monirul M Islam, Keiichi Noguchi
1Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei-shi, Tokyo, Japan.
Abstract:
Dengue viruses are classified into four serotypes. Here, we report a 1.7 Å crystal structure of a recombinant dengue-3 envelope protein domain III (ED3), which contains most of the putative epitopes. Although the fold was well conserved, we found that a local backbone deformation in the first β-strand, which contains the putative epitope-1, occurred upon domain isolation. Furthermore, a comparison with dengue-2 ED3 indicated a large structural change by as much as 4.0 Å at Asp(662), located in epitope-2. These minute structural and surface properties changes observed in the high resolution ED3 structure represent potential determinants for serospecificity and epitope recognition by antibodies.
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