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Updated: May 30, 2025

Identifying Inhibitors of the HBx-DDB1 Interaction Using a Split Luciferase Assay System
Published on: December 21, 2019
Cholesterol metabolism regulator SREBP2 inhibits HBV replication via suppression of HBx nuclear translocation
Fan Yang1,2, Feng Hu3, Hongxiao Song1
1Department of Hepatology, Center for Pathogen Biology and Infectious Diseases, Institute of Translational Medicine, The First Hospital of Jilin University, Changchun, Jilin, China.
Abstract:
The intricate link between cholesterol metabolism and host immune responses is well recognized, but the specific mechanisms by which cholesterol biosynthesis influences hepatitis B virus (HBV) replication remain unclear. In this study, we show that SREBP2, a key regulator of cholesterol metabolism, inhibits HBV replication by interacting directly with the HBx protein, thereby preventing its nuclear translocation. We also found that inhibiting the ER-to-Golgi transport of the SCAP-SREBP2 complex or blocking SREBP2 maturation significantly enhances HBV suppression. Notably, we demonstrate that the C-terminal domain (CTD) of SREBP2, rather than its N-terminal domain (NTD), mediates this inhibition by interacting with HBx and promoting its extracellular secretion, thus reducing nuclear HBx accumulation. These findings reveal a novel regulatory pathway that links cholesterol metabolism to HBV replication via SREBP2-mediated control of HBx localization. This insight provides a potential basis for new therapeutic strategies against HBV infection, addressing an important global health issue.
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