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Deciphering the intermolecular interactions between G-quadruplex (G4)-forming sequences.

Jianjun Xia1, Jiahang Zhou1, Xinzhe Zhuang1

  • 1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, China.

Nucleic Acids Research
|December 3, 2025
PubMed
Summary
This summary is machine-generated.

Guanine-rich sequences form G-quadruplex (G4) structures. This study found that intermolecular G4/G4 interactions in vitro are primarily driven by the specific sequences involved.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Biomolecular interactions are fundamental to cellular processes.
  • While protein and nucleic acid interactions are well-studied, interactions between non-canonical DNA structures remain less understood.
  • Guanine-rich sequences can form G-quadruplex (G4) structures, implicated in gene expression regulation and chromatin remodeling.

Purpose of the Study:

  • To investigate whether and how G-quadruplex (G4) structures or their G-rich sequences interact with each other.
  • To elucidate the mechanisms governing intermolecular G4/G4 interactions.

Main Methods:

  • Utilized a combination of various G-rich sequences.
  • Employed diverse experimental conditions.
  • Applied multiple biophysical and biochemical techniques for analysis.

Main Results:

  • Demonstrated that intermolecular G4/G4 interactions occur.
  • Found that these interactions are predominantly governed by primary sequence complementarity in vitro.
  • Sequence-specific interactions dictate the formation and stability of G4/G4 complexes.

Conclusions:

  • Intermolecular G4/G4 interactions are primarily sequence-dependent in an in vitro setting.
  • This finding provides insight into the potential regulatory roles of G4 structures in cellular processes.
  • Further research is warranted to explore these interactions in vivo.