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G-quadruplex as an essential structural element in cytomegalovirus replication origin.

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G-quadruplex (G4) motifs in human cytomegalovirus (HCMV) replication origins are essential for viral growth and DNA replication. These G4 structures recruit viral replication factors, suggesting they are a potential therapeutic target.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • G-quadruplex (G4) structures are present in eukaryotic replication origins, but their precise function is not fully understood.
  • The lytic DNA replication origin (oriLyt) of human cytomegalovirus (HCMV) is critical for viral propagation.

Purpose of the Study:

  • To investigate the role of G4 motifs within the HCMV oriLyt in viral replication.
  • To identify viral proteins that interact with G4 structures in the oriLyt.

Main Methods:

  • Analysis of G4 motifs in the HCMV oriLyt using recombinant viruses and replication assays.
  • Biochemical and biophysical characterization of G4 formation and its impact on DNA replication.
  • G4 pull-down assays to identify G4-binding viral proteins.
  • Enzyme-linked immunosorbent assays (ELISAs) to assess the effect of G4-binding ligands on protein-G4 interactions.

Main Results:

  • A G4 motif in the essential region I (ER-I) of the HCMV oriLyt is necessary for viral growth.
  • G4 formation in ER-I is crucial for efficient viral DNA replication.
  • Viral replication factors, including IE2, UL84, and UL44, were identified as G4-binding proteins.
  • Specific G4-binding ligands were shown to inhibit the binding of these viral proteins to G4 structures.
  • The oriLyt core element of Epstein-Barr virus also forms a G4 that can functionally substitute for the HCMV ER-I G4.

Conclusions:

  • Viral G4 structures within replication origins are essential structural elements for recruiting viral replication factors.
  • These G4 motifs play a critical role in viral DNA replication.
  • Viral G4s represent a potential therapeutic target for antiviral strategies.