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© Gail Rozen-Gagnon, Christine Schmitt,
Cells infected with Chikungunya (CHIK) virus.
Publication : Nature

Cryo-electron microscopy structure of a coronavirus spike glycoprotein trimer

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nature - 08 Feb 2016

Walls AC, Tortorici MA, Bosch BJ, Frenz B, Rottier PJM, DiMaio F, Rey FA, Veesler D

Link to Pubmed [PMID] – 26855426

Nature 2016 Mar;531(7592):114-117

The tremendous pandemic potential of coronaviruses was demonstrated twice in the past few decades by two global outbreaks of deadly pneumonia. Entry of coronaviruses into cells is mediated by the transmembrane spike glycoprotein S, which forms a trimer carrying receptor-binding and membrane fusion functions. S also contains the principal antigenic determinants and is the target of neutralizing antibodies. Here we present the structure of a mouse coronavirus S trimer ectodomain determined at 4.0 Å resolution by single particle cryo-electron microscopy. It reveals the metastable pre-fusion architecture of S and highlights key interactions stabilizing it. The structure shares a common core with paramyxovirus F proteins, implicating mechanistic similarities and an evolutionary connection between these viral fusion proteins. The accessibility of the highly conserved fusion peptide at the periphery of the trimer indicates potential vaccinology strategies to elicit broadly neutralizing antibodies against coronaviruses. Finally, comparison with crystal structures of human coronavirus S domains allows rationalization of the molecular basis for species specificity based on the use of spatially contiguous but distinct domains.

https://www.ncbi.nlm.nih.gov/pubmed/26855426