Article (Scientific journals)
Guanines are a quartet's best friend: impact of base substitutions on the kinetics and stability of tetramolecular quadruplexes
Gros, Julien; Rosu, Frédéric; Amrane, Samir et al.
2007In Nucleic Acids Research, 35 (9), p. 3064-3075
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Keywords :
DNA; G-quadruplex; kinetics; guanine; modified bases; mass spectrometry
Abstract :
[en] Parallel tetramolecular quadruplexes may be formed with short oligodeoxynucleotides bearing a block of three or more guanines. We analyze the properties of sequence variants of parallel quadruplexes in which each guanine of the central block was systematically substituted with a different base. Twelve types of substitutions were assessed in more than 100 different sequences. We conducted a comparative kinetic analysis of all tetramers. Electrospray mass spectrometry was used to count the number of inner cations, which is an indicator of the number of effective tetrads. In general, the presence of a single substitution has a strong deleterious impact on quadruplex stability, resulting in reduced quadruplex lifetime/ thermal stability and in decreased association rate constants. We demonstrate extremely large differences in the association rate constants of these quadruplexes depending on modification position and type. These results demonstrate that most guanine substitutions are deleterious to tetramolecular quadruplex structure. Despite the presence of well- defined non- guanine base quartets in a number of NMR and X- ray structures, our data suggest that most non- guanine quartets do not participate favorably in structural stability, and that these quartets are formed only by virtue of the docking platform provided by neighboring G- quartets. Two notable exceptions were found with 8- bromoguanine ( X) and 6- methyl- isoxanthopterin ( P) substitutions, which accelerate quadruplex formation by a factor of 10 when present at the 50 end. The thermodynamic and kinetic data compiled here are highly valuable for the design of DNA quadruplex assemblies with tunable association/ dissociation properties.
Disciplines :
Biochemistry, biophysics & molecular biology
Chemistry
Author, co-author :
Gros, Julien;  Museum National d'Histoire Naturelle, Paris - MNHN > USM503, INSERM U565, CNRS UMR 5153 > Laboratoire de Biophysique
Rosu, Frédéric ;  Université de Liège - ULiège > Chimie physique, spectrométrie de masse
Amrane, Samir;  Museum National d'Histoire Naturelle, Paris - MNHN > USM503, INSERM U565, CNRS UMR 5153 > Laboratoire de Biophysique
De Cian, Anne;  Museum National d'Histoire Naturelle, Paris - MNHN > USM503, INSERM U565, CNRS UMR 5153 > Laboratoire de Biophysique
Gabelica, Valérie ;  Université de Liège - ULiège > Chimie physique, spectrométrie de masse
Lacroix, Laurent;  Museum National d'Histoire Naturelle, Paris - MNHN > USM503, INSERM U565, CNRS UMR 5153 > Laboratoire de Biophysique
Mergny, Jean-Louis;  Museum National d'Histoire Naturelle, Paris - MNHN > USM503, INSERM U565, CNRS UMR 5153 > Laboratoire de Biophysique
Language :
English
Title :
Guanines are a quartet's best friend: impact of base substitutions on the kinetics and stability of tetramolecular quadruplexes
Publication date :
2007
Journal title :
Nucleic Acids Research
ISSN :
0305-1048
eISSN :
1362-4962
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
35
Issue :
9
Pages :
3064-3075
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 28 July 2008

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