Abstract
Np95/ICBP90-like RING finger protein (NIRF), a novel E3 ubiquitin ligase, has been shown to interact with HBc and promote its degradation. This study investigated the effects of NIRF on replication of hepatitis B virus (HBV) and the mechanisms. We have shown that NIRF inhibits replication of HBV DNA and secretion of HBsAg and HBeAg in HepG2 cells transfected with pAAV-HBV1.3. NIRF also inhibits the replication and secretion of HBV in a mouse model that expressed HBV. NIRF reduces acetylation of HBV cccDNA-bound H3 histones. These results showed that NIRF is involved in the HBV replication cycle not only through direct interaction with HBc but also reduces acetylation of HBV cccDNA-bound H3 histones.
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