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Title

Evaluation of the effect of polymorphism on G-quadruplex-ligand interaction by means of spectroscopic and chromatographic techniques

AuthorsBenito, S.; Ferrer, A.; Benavou, S.; Aviñó, A.; Eritja Casadellà, Ramón ; Gargallo, Raimundo
KeywordsG-quadruplex
Crystal violet
Binding equilibria
Polymorphism
Multivariate analysis
Issue Date5-May-2018
PublisherElsevier
CitationSpectrochimica Acta - A - Molecular and Biomolecular Spectroscopy: 196: 185-195 (2018)
AbstractGuanine-rich sequences may fold into highly ordered structures known as G-quadruplexes. Apart from the monomeric G-quadruplex, these sequences may form multimeric structures that are not usually considered when studying interaction with ligands. This work studies the interaction of a ligand, crystal violet, with three guanine-rich DNA sequences with the capacity to form multimeric structures. These sequences correspond to short stretches found near the promoter regions of c-kit and SMARCA4 genes. Instrumental techniques (circular dichroism, molecular fluorescence, size-exclusion chromatography and electrospray ionization mass spectrometry) and multivariate data analysis were used for this purpose. The polymorphism of G-quadruplexes was characterized prior to the interaction studies. The ligand was shown to interact preferentially with the monomeric G-quadruplex; the binding stoichiometry was 1:1 and the binding constant was in the order of 105 M−1 for all three sequences. The results highlight the importance of DNA treatment prior to interaction studies.
Publisher version (URL)https://doi.org/10.1016/j.saa.2018.02.006
URIhttp://hdl.handle.net/10261/161760
DOIhttps://doi.org/10.1016/j.saa.2018.02.006
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