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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism.   Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members.   If these new proteins contain similar amino acids in key...
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The EBNA3 Proteins.

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  • 1Section of Virology, Department of Infectious Disease, Imperial College London, London, UK. robert.e.white@imperial.ac.uk.

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|January 29, 2026
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Summary
This summary is machine-generated.

Epstein-Barr virus manipulates B cell biology using EBV nuclear antigens (EBNAs), particularly the EBNA3 family, to alter cell epigenetics, survival, and function. Their roles in B cell cancers are complex, with both tumor-promoting and suppressing activities.

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Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Epstein-Barr virus (EBV) profoundly impacts B cell biology, driving activation, proliferation, and survival.
  • Epigenetic reprogramming of the host cell genome and transcriptome is central to EBV's B cell manipulation.
  • EBV nuclear antigens (EBNAs) are key effectors in mediating these cellular changes.

Purpose of the Study:

  • To elucidate the role of the EBNA3 family proteins (EBNA3A, EBNA3B, EBNA3C) in EBV-mediated B cell manipulation.
  • To detail the genomic and transcriptomic context of EBNA3 gene expression and regulatory mechanisms.
  • To explore the impact of EBNA3 proteins on B cell survival, differentiation, and function, including oncogenic potential.

Main Methods:

  • Review of existing literature on EBNA3 proteins and their functions.
  • Analysis of genomic and transcriptomic data related to EBNA3 expression.
  • Examination of findings from mouse models investigating EBNA3 protein roles.

Main Results:

  • EBNA3 proteins are crucial for EBV's epigenetic control over B cells.
  • These proteins regulate host gene expression, influencing B cell survival, differentiation, and function.
  • Mouse models reveal dual roles for EBNA3 proteins, acting as both pro- and anti-oncogenic factors in B cell malignancies.

Conclusions:

  • The EBNA3 family plays a multifaceted role in EBV-driven B cell pathology.
  • Understanding EBNA3 regulatory mechanisms is critical for deciphering EBV's oncogenic potential.
  • Further research is needed to fully resolve the complex roles and regulation of EBNA3 proteins.