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EBNA2 and EBNA-LP: The Earliest Viral Latency Proteins
Jana M Cable1,2, Jenna C Grabowski1, Micah A Luftig3,4
1Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Duke Center for Virology, Durham, NC, USA.
Current Topics in Microbiology and Immunology
|December 2, 2025
Summary
Epstein-Barr virus (EBV) proteins EBNA2 and EBNA-LP are crucial for B cell immortalization. EBNA2 reorganizes chromatin via phase separation, while EBNA-LP independently blocks antiviral defenses, enabling viral establishment.
Area of Science:
- Virology
- Molecular Biology
- Epigenetics
Background:
- Epstein-Barr virus (EBV) latency proteins EBNA2 and EBNA-LP are expressed early after infection.
- These proteins are essential for B cell transformation and immortalization.
- They are co-expressed in latency IIb and III states and regulated by viral promoters.
Purpose of the Study:
- To elucidate the mechanisms of EBNA2 and EBNA-LP in B cell transformation and viral latency.
- To investigate EBNA2's role in chromatin reorganization and its association with autoimmune diseases.
- To define EBNA-LP's independent functions in antagonizing host restriction factors.
Main Methods:
- Analysis of EBNA2's liquid-liquid phase separation and nuclear condensate formation.
- Investigation of EBNA2's interactions with transcription factors (RBP-Jκ, EBF1) and chromatin targets.
- Characterization of EBNA-LP's antagonism of restriction factors (Sp100, Sp140L) and its role in viral genome establishment.
Main Results:
- EBNA2 forms nuclear condensates that alter host chromatin topology and create accessible domains.
- EBNA2 targets super-enhancers, altering over 1700 chromatin looping interactions genome-wide.
- EBNA-LP independently antagonizes Sp100 and Sp140L, preventing innate antiviral sensing.
- EBNA2 and EBNA-LP cooperate at EBV super-enhancers to control essential B cell transformation networks.
Conclusions:
- EBNA2 utilizes phase separation to remodel chromatin, crucial for B cell transformation.
- EBNA-LP possesses essential EBNA2-independent functions in viral immune evasion.
- Understanding these proteins' structural features and functions offers potential therapeutic targets for EBV-associated diseases, including multiple sclerosis.
Keywords:
Autoimmune diseaseB cell transformationChromatin architectureEBF1EBNA-LPEBNA2Phase separationRBP-JκSuper-enhancersTranscriptional regulationMore Related Videos
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