Envelope Proteins of Hepatitis B Virus: Molecular Biology and Involvement in Carcinogenesis

Viruses. 2021 Jun 11;13(6):1124. doi: 10.3390/v13061124.


The envelope of hepatitis B virus (HBV), which is required for the entry to hepatocytes, consists of a lipid bilayer derived from hepatocyte and HBV envelope proteins, large/middle/small hepatitis B surface antigen (L/M/SHBs). The mechanisms and host factors for the envelope formation in the hepatocytes are being revealed. HBV-infected hepatocytes release a large amount of subviral particles (SVPs) containing L/M/SHBs that facilitate escape from the immune system. Recently, novel drugs inhibiting the functions of the viral envelope and those inhibiting the release of SVPs have been reported. LHBs that accumulate in ER is considered to promote carcinogenesis and, especially, deletion mutants in the preS1/S2 domain have been reported to be associated with the development of hepatocellular carcinoma (HCC). In this review, we summarize recent reports on the findings regarding the biological characteristics of HBV envelope proteins, their involvement in HCC development and new agents targeting the envelope.

Keywords: Dane particle; HBV; envelope; subviral particle.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Antiviral Agents / pharmacology
  • Antiviral Agents / therapeutic use
  • Carcinoma, Hepatocellular / etiology
  • Cell Transformation, Viral*
  • Disease Management
  • Gene Expression Regulation, Viral
  • Genetic Variation
  • Genome, Viral
  • Hepatitis B / complications
  • Hepatitis B / diagnosis
  • Hepatitis B / drug therapy
  • Hepatitis B / virology*
  • Hepatitis B Surface Antigens / metabolism*
  • Hepatitis B virus / physiology*
  • Hepatitis B virus / ultrastructure
  • Host-Pathogen Interactions
  • Humans
  • Liver Neoplasms / etiology
  • Molecular Diagnostic Techniques
  • Viral Envelope Proteins / metabolism*
  • Virion


  • Antiviral Agents
  • Hepatitis B Surface Antigens
  • Viral Envelope Proteins