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Related Experiment Video

Updated: Jan 28, 2026

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The BOLF1 gene is necessary for effective Epstein-Barr viral infectivity.

H M Abdullah Al Masud1, Takahiro Watanabe1, Yoshitaka Sato1

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Virology
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Summary

The Epstein-Barr virus (EBV) protein BOLF1 is crucial for enhancing viral infectivity by aiding nuclear transport of incoming viruses. Its absence significantly reduces EBV

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Area of Science:

  • Virology
  • Molecular Biology

Background:

  • Epstein-Barr virus (EBV) causes infectious mononucleosis and cancers.
  • BOLF1 is a conserved EBV lytic tegument protein.

Purpose of the Study:

  • Investigate the role of EBV BOLF1 protein in viral replication and infectivity.
  • Determine BOLF1's function in the viral lytic cycle.

Main Methods:

  • Constructed BOLF1-deficient EBV using BAC and CRISPR/Cas9.
  • Assessed viral protein expression, DNA synthesis, and progeny release.
  • Analyzed viral nuclear transport and infectivity.

Main Results:

  • BOLF1 deficiency minimally impacted viral protein expression, DNA synthesis, and progeny release.
  • Loss of BOLF1 significantly reduced EBV infectivity.
  • Disruption of BOLF1 decreased nuclear transport of incoming EBV particles.
  • BOLF1 interacts with BKRF4 and both localize to the nucleus/perinuclear area during the lytic cycle.

Conclusions:

  • BOLF1 enhances EBV progeny virion infectivity.
  • BOLF1 facilitates nuclear transport of incoming nucleocapsids.
  • BOLF1 and BKRF4 play roles in nuclear localization during the EBV lytic cycle.