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Interactions between Flavins and Quadruplex Nucleic Acids.

Tobias Merkle1, Malte Sinn1, Jörg S Hartig2

  • 1Department of Chemistry and Research School Chemical Biology, University of Konstanz, Universitätsstrasse 10, P. O. Box: 630, 78457, Konstanz, Germany.

Chembiochem : a European Journal of Chemical Biology
|October 2, 2015
PubMed
Summary
This summary is machine-generated.

Flavin derivatives like FMN and FAD bind to quadruplex nucleic acids, potentially regulating gene expression. This discovery suggests intracellular flavin levels could modulate DNA structures and cellular functions.

Keywords:
DNA structuresFADflavin metabolismnucleic acidsriboswitch

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Quadruplex nucleic acids are crucial genomic structures influencing gene regulation.
  • While synthetic ligands are known, few natural metabolites interact with quadruplexes.
  • Understanding metabolite interactions could reveal novel regulatory mechanisms.

Purpose of the Study:

  • To investigate interactions between flavin derivatives and quadruplex nucleic acids.
  • To explore the potential of these interactions in modulating gene expression.
  • To identify natural compounds that can act as riboswitch-like regulators of quadruplexes.

Main Methods:

  • Studied interactions between flavin derivatives (FMN, FAD) and parallel quadruplexes.
  • Measured binding affinities using dissociation constants (Kd).
  • Considered intracellular flavin concentrations in E. coli.

Main Results:

  • Flavin derivatives, FMN and FAD, were found to interact with quadruplex nucleic acids.
  • Highest affinities were observed with parallel quadruplexes, showing low dissociation constants (14-20 μm).
  • Intracellular flavin concentrations in E. coli (243 μm) suggest these interactions are physiologically relevant.

Conclusions:

  • Flavin derivatives can bind to quadruplex nucleic acids, particularly parallel structures.
  • These interactions present a potential mechanism for flavin levels to influence gene expression.
  • This opens possibilities for flavin-based riboswitch-like regulation of genomic functions.