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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Related Experiment Video

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Modeling Hepatitis B Virus Infection in Non-Hepatic 293T-NE-3NRs Cells
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Hepatitis B Virus Exploits ERGIC-53 in Conjunction with COPII to Exit Cells.

Lisa Zeyen1, Tatjana Döring1, Reinhild Prange1

  • 1Institute for Virology, University Medical Center of the Johannes Gutenberg University Mainz, Augustusplatz, D-55131 Mainz, Germany.

Cells
|August 19, 2020
PubMed
Summary

Hepatitis B virus (HBV) uses cellular ERGIC-53 and COPII export machinery for replication. Targeting these interactions offers new therapeutic strategies against HBV infection.

Keywords:
COPIIERGIC-53HBVHBV assemblyHBV egressLMAN-1N-glycosylationSec24A

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Area of Science:

  • Virology
  • Cell Biology
  • Molecular Medicine

Background:

  • Hepatitis B virus (HBV) remains a significant global health challenge.
  • Understanding virus-host interactions is key to developing effective antiviral therapies.
  • HBV relies heavily on host cell machinery for its lifecycle due to its compact genome.

Purpose of the Study:

  • To identify and characterize cellular factors involved in hepatitis B virus (HBV) trafficking and egress.
  • To elucidate the specific roles of ERGIC-53 and COPII components in HBV propagation.
  • To explore potential therapeutic targets within the HBV assembly and egress pathways.

Main Methods:

  • Biochemical-silencing methods were employed in HBV-expressing liver cells.
  • Molecular interaction studies were conducted to map viral-host protein interactions.
  • Cell-imaging techniques were utilized to visualize HBV assembly and trafficking dynamics.

Main Results:

  • The cellular lectin ERGIC-53 and COPII export machinery components (Sec24A, Sec23B, Sar1) were identified as crucial for HBV trafficking.
  • COPII subunits are essential for both viral and subviral HBV particle release.
  • ERGIC-53 specifically facilitates viral particle propagation by interacting with the HBV envelope N146-glycan.
  • HBV assembly initiates in ER-derived compartments, utilizing ERGIC-53, Sec24A, and ESCRT components.

Conclusions:

  • HBV assembly and egress are dependent on host cell factors, including ERGIC-53 and the COPII machinery.
  • ERGIC-53 plays a unique and critical role in viral particle propagation, distinct from general particle export.
  • The findings reveal novel mechanisms of HBV assembly and trafficking, highlighting ERGIC-53 and Sec24A as potential therapeutic targets.