Cryo-EM structure of the mature dengue virus at 3.5-A resolution.Zhang, X., Ge, P., Yu, X., Brannan, J.M., Bi, G., Zhang, Q., Schein, S., Zhou, Z.H.
(2012) Nat Struct Mol Biol 20: 105-110
- PubMed: 23241927
- DOI: https://doi.org/10.1038/nsmb.2463
- Primary Citation of Related Structures:
- PubMed Abstract:
Regulated by pH, membrane-anchored proteins E and M function during dengue virus maturation and membrane fusion. Our atomic model of the whole virion from cryo-electron microscopy at 3.5-Å resolution reveals that in the mature virus at neutral extracellular pH, the N-terminal 20-amino-acid segment of M (involving three pH-sensing histidines) latches and thereby prevents spring-loaded E fusion protein from prematurely exposing its fusion peptide. This M latch is fastened at an earlier stage, during maturation at acidic pH in the trans-Golgi network. At a later stage, to initiate infection in response to acidic pH in the late endosome, M releases the latch and exposes the fusion peptide. Thus, M serves as a multistep chaperone of E to control the conformational changes accompanying maturation and infection. These pH-sensitive interactions could serve as targets for drug discovery.
Department of Microbiology, Immunology and Molecular Genetics, University of California, Los Angeles-UCLA, Los Angeles, California, USA.