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The RIG-I receptor induces the innate antiviral responses upon sensing RNA viruses. The mechanisms through which RIG-I optimizes the strength of the downstream signaling remain incompletely understood. In this study, we identified that NSUN5 could potentiate the RIG-I innate signaling pathway. Deficiency of NSUN5 enhanced RNA virus proliferation and inhibited the induction of the downstream antiviral genes. Consistently, NSUN5 - deficient mice were more susceptible to RNA virus infection than their wild-type littermates. Mechanistically, NSUN5 bound directly to both viral RNA and RIG-I, synergizing the recognition of dsRNA by RIG-I. Collectively, to our knowledge, this study characterized NSUN5 as a novel RIG-I coreceptor, playing a vital role in restricting RNA virus infection.

NSUN5 Facilitates Viral RNA Recognition by RIG-I Receptor