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Multimerization rules for G-quadruplexes.

Sofia Kolesnikova1,2, Martin Hubálek1, Lucie Bednárová1

  • 1The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague 166 10, Czech Republic.

Nucleic Acids Research
|September 16, 2017
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Summary
This summary is machine-generated.

G-quadruplexes can form higher-order structures like dimers and tetramers. Specific sequence variations in G-quadruplexes dictate their ability to multimerize, revealing new structural insights.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • G-quadruplexes are nucleic acid structures with diverse biological roles.
  • The sequence requirements for G-quadruplex multimerization remain largely unknown.
  • Understanding G-quadruplex higher-order structures is crucial for their functional characterization.

Purpose of the Study:

  • To investigate the sequence requirements for G-quadruplex multimerization.
  • To explore the formation of dimeric and tetrameric G-quadruplex structures.
  • To characterize the sequence determinants of homomultimeric and heteromultimeric G-quadruplexes.

Main Methods:

  • Systematic mutagenesis of the central tetrad in a parallel-strand G-quadruplex.
  • High-throughput screening to assess monomeric, dimeric, and tetrameric formation.
  • Investigation of structural formation across various monovalent and divalent metal ions.

Main Results:

  • Approximately 10% of 256 central tetrad variants formed dimers or tetramers.
  • G-quadruplex multimerization occurred in diverse ionic conditions and showed high cooperativity.
  • Distinct sequence requirements were identified for dimeric/tetrameric G-quadruplexes and heteromultimers.

Conclusions:

  • G-quadruplex multimerization is sequence-dependent, with specific variants favoring higher-order structures.
  • The study elucidates sequence requirements for both homomultimeric and heteromultimeric G-quadruplex formation.
  • These findings enhance our understanding of G-quadruplex structural diversity and formation.