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Influence of loop size on the stability of intramolecular DNA quadruplexes

Risitano, A. and Fox, K.R. (2004) Influence of loop size on the stability of intramolecular DNA quadruplexes Nucleic Acids Research, 32, (8), pp. 2598-2606. (doi:10.1093/nar/gkh598).

Record type: Article


We have determined the stability of intramolecular DNA quadruplexes in which the four G(3)-tracts are connected by non-nucleosidic linkers containing propanediol, octanediol or hexaethylene glycol, replacing the TTA loops in the human telomeric repeat sequence. We find that these sequences all fold to form intramolecular complexes, which are stabilized by lithium < sodium < potassium. Quadruplex stability increases in the order propanediol < hexaethylene glycol < octanediol. The shallower shape of the melting profile with propanediol linkers and its lower dependency on potassium concentration suggests that this complex contains fewer stacks of G-quartets. The sequence with octanediol linkers displays a biphasic melting profile, suggesting that it can adopt more than one stable structure. All these complexes display melting temperatures above 310 K in the presence of 10 mM lithium, without added potassium, in contrast to the telomeric repeat sequence. These complexes also fold much faster than the telomeric repeat and there is little or no hysteresis between their melting and annealing profiles. In contrast, the human telomeric repeat sequence and a complex containing two hexaethylene glycol groups in each loop, are less stable and fold more slowly. The melting and annealing profiles for the latter sequence show significant differences, even when heated at 0.2degreesC min(-1). CD spectra for the oligonucleotides containing non-nucleosidic linkers show positive maxima at 264 nm, with negative minima similar to244 nm, which are characteristic of parallel quadruplex structures. These results show that the structure and stability of intramolecular quadruplexes is profoundly influenced by the length and composition of the loops.

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Submitted date: 11 February 2004
Published date: 11 May 2004
Keywords: tetrad-forming oligonucleotides, stranded guanine tetraplex, resonance energy-transfer, telomeric dna, crystal-structure, quartet structures, in-vitro, c-myc, region, resolution


Local EPrints ID: 24229
ISSN: 0305-1048
PURE UUID: 2f21fe77-666a-44d7-b776-cafe8381a026
ORCID for K.R. Fox: ORCID iD

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Date deposited: 29 Mar 2006
Last modified: 17 Jul 2017 16:14

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Author: A. Risitano
Author: K.R. Fox ORCID iD

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