RESUMEN

Poxviruses are important human and animal pathogens that have evolved elaborate strategies for antagonizing host innate and adaptive immunity. The E3 protein of vaccinia virus, the prototypic member of the orthopoxviruses, functions as an inhibitor of innate immune signaling and is essential for vaccinia virus replication in vivo and in many human cell culture systems. However, the function of orthologues of E3 expressed by poxviruses of other genera with different host specificity remains largely unknown. In the present study, we characterized the E3 orthologues from sheeppox virus, yaba monkey tumor virus, swinepox virus, and myxoma virus for their ability to modulate protein kinase R (PKR) function, cytokine responses and virus pathogenicity. We found that the E3 orthologues of myxoma virus and swinepox virus could suppress PKR activation and interferon (IFN)-induced antiviral activities and restore the host range function of E3 in HeLa cells. In contrast, the E3 orthologues from sheeppox virus and yaba monkey tumor virus were unable to inhibit PKR activation. While the sheeppox orthologue was unable to restore the host range function of E3, the yaba monkey tumor virus orthologue partially restored E3-deficient vaccinia virus replication in HeLa cells, correlated with its ability to suppress IFN-induced antiviral activities. Moreover, poxvirus E3 orthologues show varying ability to inhibit the induction of antiviral and proinflammatory cytokines. Despite these in vitro results, none of the E3 orthologues tested was capable of restoring pathogenicity to E3-deficient vaccinia virus in vivo.

Asunto(s)

Citocinas/metabolismo , Proteínas de Unión al ARN/metabolismo , Virus Vaccinia/metabolismo , Virus Vaccinia/patogenicidad , Vaccinia/inmunología , Vaccinia/virología , Proteínas Virales/metabolismo , eIF-2 Quinasa/metabolismo , Secuencia de Aminoácidos , Animales , Western Blotting , Cricetinae , Citocinas/genética , Femenino , Células HeLa , Humanos , Inmunoprecipitación , Ratones , Ratones Endogámicos BALB C , Datos de Secuencia Molecular , Fosforilación , ARN Mensajero/genética , ARN Interferente Pequeño/genética , Proteínas de Unión al ARN/genética , Reacción en Cadena en Tiempo Real de la Polimerasa , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Homología de Secuencia de Aminoácido , Transducción de Señal , Vaccinia/metabolismo , Virus Vaccinia/genética , Proteínas Virales/genética , Replicación Viral , eIF-2 Quinasa/antagonistas & inhibidores , eIF-2 Quinasa/genética