Crystal structure of the human astrovirus capsid spike
| Autor: | Yizhi Tao, Liping Dong, Jinhui Dong, Ernesto Méndez |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Models
Molecular Avastrovirus Viral protein viruses Biology medicine.disease_cause Astrovirus Capsid fluids and secretions Protein structure X-Ray Diffraction Hepatitis E virus medicine Humans Homology modeling Protein Structure Quaternary Multidisciplinary Dose-Response Relationship Drug Cryoelectron Microscopy Dextran Sulfate virus diseases RNA Biological Sciences biology.organism_classification Virology Recombinant Proteins Protein Subunits Capsid Proteins Heparitin Sulfate Caco-2 Cells Protein Multimerization Crystallization |
| Zdroj: | Proceedings of the National Academy of Sciences. 108:12681-12686 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.1104834108 |
| Popis: | Astroviruses are single-stranded, plus-sense RNA viruses that infect both mammals and birds, causing gastroenteritis and other extraintestinal diseases. Clinical studies have established astroviruses as the second leading cause of viral diarrhea in young children. Here we report the crystal structure of the human astrovirus dimeric surface spike determined to 1.8-Å resolution. The overall structure of each spike/projection domain has a unique three-layered β-sandwiches fold, with a core, six-stranded β-barrel structure that is also found in the hepatitis E virus capsid protrusions, suggesting a closer phylogenetic relationship between these two viruses than previously acknowledged. Based on a hepatitis E virus capsid model, we performed homology modeling and produced a complete, T = 3 astrovirus capsid model with features remarkably similar to those observed in a cryoelectron microscopy reconstruction image of a human astrovirus. Mapping conserved residues onto the astrovirus projection domain revealed a putative receptor binding site with amino acid compositions characteristic for polysaccharide recognition. Our results will have an important impact on future characterization of astrovirus structure and function, and will likely have practical applications in the development of vaccines and antivirals. |
| Databáze: | OpenAIRE |
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