E3 ubiquitin ligase TRIM21 restricts hepatitis B virus replication by targeting HBx for proteasomal degradation

被引:43
作者
Song, Yahui [1 ]
Li, Min [1 ]
Wang, Yanqi [1 ]
Zhang, Hongkai [1 ]
Wei, Lin [1 ]
Xu, Wei [1 ]
机构
[1] Soochow Univ, Inst Biol & Med Sci, 199 RengAi Rd, Suzhou 215123, Peoples R China
关键词
Hepatitis B virus; TRIM21; HBV X protein; Ubiquitination; Smc6; HEPATOCELLULAR-CARCINOMA; PROTEIN; NEUTRALIZATION; TRANSCRIPTION; ACTIVATION; GROWTH; SMC5/6;
D O I
10.1016/j.antiviral.2021.105107
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
As a cytosol ubiquitin ligase and antibody receptor, Tripartite motif-containing 21 (TRIM21) has been reported to mediate the restriction of hepatitis B virus (HBV) through an HBx-antibody-dependent intracellular neutralization (ADIN) mechanism. However, whether TRIM21 limits HBV replication by targeting viral proteins remains unclarified. In this study, we demonstrate that TRIM21 inhibits HBV gene transcription and replication in HBV plasmid transfected and HBV-infected hepatoma cells. RING and PRY-SPRY domains are involved in this activity. TRIM21 interacts with HBx protein and targets HBx for ubiquitination and proteasomal degradation, leading to impaired HBx-mediated degradation of structural maintenance of chromosomes 6 (Smc6) and suppression of HBV replication. TRIM21 fails to restrict the replication of an HBx-deficient HBV. And knock-down of Smc6 largely impairs the anti-HBV activity of TRIM21 in HepG2 cells. In a hydrodynamic injection (HDI)-based HBV mouse model, we confirm an in vivo anti-HBV and anti-HBx therapeutic effect of TRIM21 by over-expression or knocking-out strategy. Our findings reveal a novel mechanism that TRIM21 restricts HBV replication through targeting HBx-Smc5/6 pathway, which may have an implication in the future TRIM21-based therapeutic application.
引用
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页数:10
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