Crystal Structure of the Pre-fusion Nipah Virus Fusion Glycoprotein Reveals a Novel Hexamer-of-Trimers Assembly

Kai Xu, Yee Peng Chan, Birgit Bradel-Tretheway, Zeynep Akyol-Ataman, Yongqun Zhu, Somnath Dutta, Lianying Yan, Yan Ru Feng, Lin Fa Wang, Georgios Skiniotis, Benhur Lee, Z. Hong Zhou, Christopher C. Broder, Hector C. Aguilar, Dimitar B. Nikolov

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Nipah virus (NiV) is a paramyxovirus that infects host cells through the coordinated efforts of two envelope glycoproteins. The G glycoprotein attaches to cell receptors, triggering the fusion (F) glycoprotein to execute membrane fusion. Here we report the first crystal structure of the pre-fusion form of the NiV-F glycoprotein ectodomain. Interestingly this structure also revealed a hexamer-of-trimers encircling a central axis. Electron tomography of Nipah virus-like particles supported the hexameric pre-fusion model, and biochemical analyses supported the hexamer-of-trimers F assembly in solution. Importantly, structure-assisted site-directed mutagenesis of the interfaces between F trimers highlighted the functional relevance of the hexameric assembly. Shown here, in both cell-cell fusion and virus-cell fusion systems, our results suggested that this hexamer-of-trimers assembly was important during fusion pore formation. We propose that this assembly would stabilize the pre-fusion F conformation prior to cell attachment and facilitate the coordinated transition to a post-fusion conformation of all six F trimers upon triggering of a single trimer. Together, our data reveal a novel and functional pre-fusion architecture of a paramyxoviral fusion glycoprotein.

Original languageEnglish
Article numbere1005322
JournalPLoS Pathogens
Volume11
Issue number12
DOIs
StatePublished - 2015

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