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Analyses of mutations selected by passaging a chimeric flavivirus identify mutations that alter infectivity and reveal an interaction between the structural proteins and the nonstructural glycoprotein NS1.

Abstract：

:We previously described a single-cycle dengue vaccine (RepliVAX D2) engineered from a capsid (C) gene-deleted West Nile virus (WNV) expressing dengue virus serotype 2 (DENV2) prM/E genes in place of the corresponding WNV genes. That work demonstrated that adaptation of RepliVAX D2 to grow in WNV C-expressing cells resulted in acquisition of non-synonymous mutations in the DENV2 prM/E and WNV NS2A/NS3 genes. Here we demonstrate that the prM/E mutations increase the specific infectivity of chimeric virions and the NS2A/NS3 mutations independently enhance packaging. Studies with the NS2A mutant demonstrated that it was unable to produce a larger form of NS1 (NS1'), suggesting that the mutation had been selected to eliminate a ribosomal frame-shift "slippage site" in NS2A. Evaluation of a synonymous mutation at this slippage site confirmed that genomes that failed to make NS1' were packaged more efficiently than WT genomes supporting a role for NS1/NS1' in orchestrating virion assembly.

journal_name

Virology

journal_title

Virology

authors

Winkelmann ER,Widman DG,Suzuki R,Mason PW

doi

10.1016/j.virol.2011.09.007

subject

Has Abstract

pub_date

2011-12-20 00:00:00

pages

96-104

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(11)00426-0

journal_volume

421

pub_type

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