A single mutation in the envelope protein modulates flavivirus antigenicity, stability, and pathogenesis.

Abstract:

:The structural flexibility or 'breathing' of the envelope (E) protein of flaviviruses allows virions to sample an ensemble of conformations at equilibrium. The molecular basis and functional consequences of virus conformational dynamics are poorly understood. Here, we identified a single mutation at residue 198 (T198F) of the West Nile virus (WNV) E protein domain I-II hinge that regulates virus breathing. The T198F mutation resulted in a ~70-fold increase in sensitivity to neutralization by a monoclonal antibody targeting a cryptic epitope in the fusion loop. Increased exposure of this otherwise poorly accessible fusion loop epitope was accompanied by reduced virus stability in solution at physiological temperatures. Introduction of a mutation at the analogous residue of dengue virus (DENV), but not Zika virus (ZIKV), E protein also increased accessibility of the cryptic fusion loop epitope and decreased virus stability in solution, suggesting that this residue modulates the structural ensembles sampled by distinct flaviviruses at equilibrium in a context dependent manner. Although the T198F mutation did not substantially impair WNV growth kinetics in vitro, studies in mice revealed attenuation of WNV T198F infection. Overall, our study provides insight into the molecular basis and the in vitro and in vivo consequences of flavivirus breathing.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Goo L,VanBlargan LA,Dowd KA,Diamond MS,Pierson TC

doi

10.1371/journal.ppat.1006178

subject

Has Abstract

pub_date

2017-02-16 00:00:00

pages

e1006178

issue

2

eissn

1553-7366

issn

1553-7374

pii

PPATHOGENS-D-16-01717

journal_volume

13

pub_type

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