An inability to maintain the ribonucleoprotein genomic structure is responsible for host detection of negative-sense RNA viruses

Abstract

SUMMARYCellular biology has a uniformity not shared amongst viruses. This is perhaps best exemplified by negative-sense RNA viruses that encode their genetic material as a ribonucleoprotein complex composed of genome, RNA-dependent RNA polymerase, and the nucleoprotein. Here we demonstrate that limiting nucleoprotein availability not only universally culminates in a replicative catastrophe for negative-sense RNA viruses, but it results in the production of aberrant genomic material and induction of the interferon-based host defenses. This dynamic illustrates the tremendous stress imposed on negative-sense RNA viruses during replication as genomic products accumulate in an environment that requires an increasing demand on nucleoprotein availability. We show that limiting NP by RNA interference or drug targeting blocks replication and primes neighboring cells through the production of interferon. Together, these results demonstrate that the nucleoprotein represents the Achilles heel of the entire phylum of negative-sense RNA viruses. Here we establish this principle for a diverse collection of human pathogens and propose that the nucleoprotein should be a primary target for the development of future antiviral drugs.HIGHLIGHTSLimited levels of NP result in production of defective viral genomesDefective viral genomes and viral antagonists are key determinants of the host antiviral responseThe host response and defective viral genome generation further exasperate NP availabilityNP is an optimal drug target for the whole phylum of negative-sense RNA viruses