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Updated: May 14, 2026

Monitoring Activation of the Antiviral Pattern Recognition Receptors RIG-I And PKR By Limited Protease Digestion and Native PAGE
Published on: July 29, 2014
RAD23A negatively regulates RIG-I/MDA5 signaling through promoting TRAF2 polyubiquitination and degradation
Di-Feng Fang1, Kun He, Jie Wang
1Cancer Center, The First Hospital, Jilin University, Changchun 130021, PR China.
Abstract:
RIG-I/MDA5 plays a pivotal role in innate immunity by detecting intracellular double-stranded RNA (dsRNA) and activating the transcription of type I interferons and proinflammatory factors, but the exactly regulating mechanism of RIG-I/MDA5 signaling remains elusive. In this study, UbL-UBA domain containing protein RAD23A was identified as a negative regulator of RIG-I/MDA5-mediated signaling activation through a small interfering RNA (siRNA)-based screening. Knockdown of RAD23A augmented the expression of RIG-I/MDA5-mediated expression of proinflammatory cytokines and IFN-β whereas ectopic expression of RAD23A showed the converse effect. Moreover, we confirmed the interaction between RAD23A and tumor necrosis factor receptor-associated factor 2 (TRAF2), an essential mediator of RIG-I/MDA5 signaling, and found that RAD23A down-regulated TRAF2 protein level through ubiquitin-proteasome system. Therefore, this study identified RAD23A as a novel negative regulator of RIG-I/MDA5 mediated anti-virus response.
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