Affordable Access

deepdyve-link
Publisher Website

Asymmetric distyrylpyridinium dyes as red-emitting fluorescent probes for quadruplex DNA.

Authors
  • Xie, Xiao
  • Choi, Bina
  • Largy, Eric
  • Guillot, Régis
  • Granzhan, Anton
  • Teulade-Fichou, Marie-Paule
Type
Published Article
Journal
Chemistry - A European Journal
Publisher
Wiley (John Wiley & Sons)
Publication Date
Jan 21, 2013
Volume
19
Issue
4
Pages
1214–1226
Identifiers
DOI: 10.1002/chem.201203710
PMID: 23292703
Source
Medline
License
Unknown

Abstract

The interactions of three cationic distyryl dyes, namely 2,4-bis(4-dimethylaminostyryl)-1-methylpyridinium (1a), its derivative with a quaternary aminoalkyl chain (1b), and the symmetric 2,6-bis(4-dimethylaminostyryl)-1-methylpyridinium (2a), with several quadruplex and duplex nucleic acids were studied with the aim to establish the influence of the geometry of the dyes on their DNA-binding and DNA-probing properties. The results from spectrofluorimetric titrations and thermal denaturation experiments provide evidence that asymmetric (2,4-disubstituted) dyes 1a and 1b bind to quadruplex DNA structures with a near-micromolar affinity and a fair selectivity with respect to double-stranded (ds) DNA [K(a)(G4)/K(a)(ds)=2.5-8.4]. At the same time, the fluorescence of both dyes is selectively increased in the presence of quadruplex DNAs (more than 80-100-fold in the case of human telomeric quadruplex), even in the presence of an excess of competing double-stranded DNA. This optical selectivity allows these dyes to be used as quadruplex-DNA-selective probes in solution and stains in polyacrylamide gels. In contrast, the symmetric analogue 2a displays a strong binding preference for double-stranded DNA [K(a) (ds)/K(a) (G4)=40-100), presumably due to binding in the minor groove. In addition, 2a is not able to discriminate between quadruplex and duplex DNA, as its fluorescence is increased equally well (20-50-fold) in the presence of both structures. This study emphasizes and rationalizes the strong impact of subtle structural variations on both DNA-recognition properties and fluorimetric response of organic dyes.

Report this publication

Statistics

Seen <100 times