Implication for alphavirus host-cell entry and assembly indicated by a 3.5 angstrom resolution cryo-EM structure.Chen, L., Wang, M., Zhu, D., Sun, Z., Ma, J., Wang, J., Kong, L., Wang, S., Liu, Z., Wei, L., He, Y., Wang, J., Zhang, X.
(2018) Nat Commun 9: 5326-5326
- PubMed: 30552337
- DOI: https://doi.org/10.1038/s41467-018-07704-x
- Primary Citation of Related Structures:
- PubMed Abstract:
Alphaviruses are enveloped RNA viruses that contain several human pathogens. Due to intrinsic heterogeneity of alphavirus particles, a high resolution structure of the virion is currently lacking. Here we provide a 3.5 Å cryo-EM structure of Sindbis virus, using block based reconstruction method that overcomes the heterogeneity problem. Our structural analysis identifies a number of conserved residues that play pivotal roles in the virus life cycle. We identify a hydrophobic pocket in the subdomain D of E2 protein that is stabilized by an unknown pocket factor near the viral membrane. Residues in the pocket are conserved in different alphaviruses. The pocket strengthens the interactions of the E1/E2 heterodimer and may facilitate virus assembly. Our study provides structural insights into alphaviruses that may inform the design of drugs and vaccines.
National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 100101, Beijing, People's Republic of China. firstname.lastname@example.org.