Binding of glutathione to enterovirus capsids is essential for virion morphogenesis

Hendrik Jan Thibaut, Lonneke van der Linden, Ping Jiang, Bert Thys, María-Dolores Canela, Leire Aguado, Bart Rombaut, Eckard Wimmer, Aniko Paul, María-Jesús Pérez-Pérez, Frank J M van Kuppeveld, Johan Neyts

    Research output: Contribution to journalArticleAcademicpeer-review

    Abstract

    Enteroviruses (family of the Picornaviridae) cover a large group of medically important human pathogens for which no antiviral treatment is approved. Although these viruses have been extensively studied, some aspects of the viral life cycle, in particular morphogenesis, are yet poorly understood. We report the discovery of TP219 as a novel inhibitor of the replication of several enteroviruses, including coxsackievirus and poliovirus. We show that TP219 binds directly glutathione (GSH), thereby rapidly depleting intracellular GSH levels and that this interferes with virus morphogenesis without affecting viral RNA replication. The inhibitory effect on assembly was shown not to depend on an altered reducing environment. Using TP219, we show that GSH is an essential stabilizing cofactor during the transition of protomeric particles into pentameric particles. Sequential passaging of coxsackievirus B3 in the presence of low GSH-levels selected for GSH-independent mutants that harbored a surface-exposed methionine in VP1 at the interface between two protomers. In line with this observation, enteroviruses that already contained this surface-exposed methionine, such as EV71, did not rely on GSH for virus morphogenesis. Biochemical and microscopical analysis provided strong evidence for a direct interaction between GSH and wildtype VP1 and a role for this interaction in localizing assembly intermediates to replication sites. Consistently, the interaction between GSH and mutant VP1 was abolished resulting in a relocalization of the assembly intermediates to replication sites independent from GSH. This study thus reveals GSH as a novel stabilizing host factor essential for the production of infectious enterovirus progeny and provides new insights into the poorly understood process of morphogenesis.

    Original languageEnglish
    Pages (from-to)e1004039
    JournalPLoS Pathogens
    Volume10
    Issue number4
    DOIs
    Publication statusPublished - Apr 2014

    Keywords

    • Animals
    • Capsid
    • Cercopithecus aethiops
    • Enterovirus B, Human
    • Enterovirus Infections
    • Glutathione
    • HeLa Cells
    • Humans
    • Mutation
    • RNA, Viral
    • Vero Cells
    • Virus Replication

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