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G Protein-selective GPCR Conformations Measured Using FRET Sensors in a Live Cell Suspension Fluorometer Assay
09:12

G Protein-selective GPCR Conformations Measured Using FRET Sensors in a Live Cell Suspension Fluorometer Assay

Published on: September 10, 2016

Affinity and selectivity of G4 ligands measured by FRET

Anne De Cian1, Lionel Guittat, Kazuo Shin-ya

  • 1Laboratoire de Biophysique, INSERM U565, CNRS UMR5153, Muséum National d'Histoire Naturelle, 43 rue Cuvier, 75005 Paris, France.

Nucleic Acids Symposium Series (2004)
|December 8, 2006
PubMed

Insights

Telomestatin and a cationic porphyrin stabilize telomeric G-quadruplex DNA, inhibiting telomerase. Telomestatin demonstrates superior selectivity for G-quadruplex over double-stranded DNA, indicating its potential as an anticancer agent.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Telomeric G-rich DNA forms intramolecular quadruplex structures in vitro.
  • These G-quadruplex structures inhibit telomerase activity.
  • Telomerase reactivation is common in cancer, making it a therapeutic target.

Purpose of the Study:

  • To analyze the stabilization and selectivity of telomestatin and a cationic porphyrin.
  • To evaluate their efficacy against human telomeric G-quadruplex species.

Main Methods:

  • Förster Resonance Energy Transfer (FRET) was employed.
  • Competition experiments with double-stranded DNA were conducted.

Main Results:

  • Both ligands strongly stabilize the G-quadruplex structure.
  • Telomestatin exhibited significantly higher selectivity for G-quadruplex compared to the cationic porphyrin.
  • Competition assays confirmed telomestatin's preferential binding to G-quadruplex DNA.

Conclusions:

  • Telomestatin and cationic porphyrin are effective G-quadruplex stabilizers.
  • Telomestatin shows promising selectivity, supporting its potential as a targeted anticancer therapeutic.
  • Further research into telomestatin's anticancer properties is warranted.

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