CD-loop Extension in Zika Virus Envelope Protein Key for Stability and Pathogenesis

Emily N. Gallichotte, Kenneth H. Dinnon, Xin Ni Lim, Thiam Seng Ng, Elisa X.Y. Lim, Vineet Menachery, Shee Mei Lok, Ralph S. Baric

Research output: Contribution to journalArticle

7 Scopus citations


With severe disease manifestations including microcephaly, congenital malformation, and Guillain-Barré syndrome, Zika virus (ZIKV) remains a persistent global public health threat. Despite antigenic similarities with dengue viruses, structural studies have suggested the extended CD-loop and hydrogen-bonding interaction network within the ZIKV envelope protein contribute to stability differences between the viral families. This enhanced stability may lead to the augmented infection, disease manifestation, and persistence in body fluids seen following ZIKV infection. To examine the role of these motifs in infection, we generated a series of ZIKV recombinant viruses that disrupted the hydrogen-bonding network (350A, 351A, and 350A/351A) or the CD-loop extension (Δ346). Our results demonstrate a key role for the ZIKV extended CD-loop in cell-type-dependent replication, virion stability, and in vivo pathogenesis. Importantly, the Δ346 mutant maintains similar antigenicity to wild-type virus, opening the possibility for its use as a live-attenuated vaccine platform for ZIKV and other clinically relevant flaviviruses.

Original languageEnglish (US)
Pages (from-to)1196-1204
Number of pages9
JournalThe Journal of infectious diseases
Issue number10
StatePublished - Dec 5 2017


  • cryo-electron microscopy
  • flavivirus
  • stability
  • structural virology
  • Zika virus

ASJC Scopus subject areas

  • Immunology and Allergy
  • Infectious Diseases

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    Gallichotte, E. N., Dinnon, K. H., Lim, X. N., Ng, T. S., Lim, E. X. Y., Menachery, V., Lok, S. M., & Baric, R. S. (2017). CD-loop Extension in Zika Virus Envelope Protein Key for Stability and Pathogenesis. The Journal of infectious diseases, 216(10), 1196-1204.