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Related Experiment Video

Updated: Dec 31, 2025

Isolation and Quantification of Epstein-Barr Virus from the P3HR1 Cell Line
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Epstein-Barr Virus BBRF2 Is Required for Maximum Infectivity.

H M Abdullah Al Masud1,2, Yusuke Yanagi1, Takahiro Watanabe1

  • 1Department of Virology, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan.

Microorganisms
|January 1, 2020
PubMed
Summary

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Epstein-Barr virus (EBV) gene BBRF2 is crucial for progeny virus infectivity. Its interaction with BSRF1 protein enhances viral spread by preventing BSRF1 degradation.

Area of Science:

  • Virology
  • Molecular Biology
  • Oncology

Background:

  • Epstein-Barr virus (EBV), a gammaherpesvirus, is linked to infectious mononucleosis and cancers.
  • BBRF2 is an uncharacterized EBV gene expressed during the lytic replication phase.

Purpose of the Study:

  • To investigate the function of the EBV BBRF2 gene.
  • To determine the role of BBRF2 in viral replication and infectivity.

Main Methods:

  • Generation of BBRF2-knockout EBV using bacterial artificial chromosome (BAC) technology and CRISPR/Cas9.
  • Analysis of viral gene expression, DNA synthesis, and progeny production.
  • Subcellular localization studies of BBRF2 and its interaction with BSRF1.
  • Assessment of BSRF1 protein stability in the presence of BBRF2.
Keywords:
BACBBRF2CRISPR/Cas9EBVlytic cycle

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Last Updated: Dec 31, 2025

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Main Results:

  • Disruption of BBRF2 did not affect viral gene expression, DNA synthesis, or progeny secretion.
  • BBRF2 knockout significantly reduced the infectivity of progeny viruses.
  • BBRF2 protein localizes to the nucleus and cytoplasm; coexpression with BSRF1 directs it to the cytoplasm.
  • BBRF2 protects BSRF1 from proteasome/ubiquitin-dependent degradation.

Conclusions:

  • BBRF2 plays a significant role in augmenting EBV infectivity.
  • The BBRF2-BSRF1 interaction enhances viral spread by stabilizing BSRF1.
  • BBRF2 is a potential target for therapeutic interventions against EBV-associated diseases.