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Title: The effect of l-thymidine, acyclic thymine and 8-bromoguanine on the stability of model G-quadruplex structures
Author: Aviñó Andrés, Anna
Mazzini, Stefania
Fàbrega i Claveria, Ma. Carme
Peñalver, Pablo
Gargallo Gómez, Raimundo
Morales, J.C.
Eritja i Casadellà, Ramon
Keywords: Biologia molecular
Molecular biology
Issue Date: 2-Oct-2016
Publisher: Elsevier B.V.
Abstract: Background Guanine-rich oligonucleotides are capable of forming tetrahelical structures known as G-quadruplexes with interesting biological properties. We have investigated the effects of site-specific substitution in the loops and in the tetrads model G-quadruplexes using thymine glycol nucleic acid (GNA) units, l-thymidine and 8-Br-2′-deoxyguanosine. Methods Modified oligonucleotides were chemically synthesized and spectroscopic techniques were used to determine the relative stability of the modified G-quadruplex. The double 8-BrdG-modified quadruplexes were further characterized by Nuclear Magnetic Resonance. Binding to thrombin of selected quadruplex was analyzed by gel electrophoresis retention assay. Results The most interesting results were found with a 8-bromoG substitution that had the larger stabilization of the quadruplex. NMR studies indicate a tight relationship between the loops and the tetrads to accommodate 8-bromoG modifications within the TBA. Conclusions The substitutions of loop positions with GNA T affect the TBA stability except for single modification in T7 position. Single l-thymidine substitutions produced destabilization of TBA. Larger changes on quadruplex stability are observed with the use of 8-bromoG finding a single substitution with the highest thermal stabilization found in thrombin binding aptamers modified at the guanine residues and having good affinity for thrombin. Double 8-BrdG modification in anti positions of different tetrads produce a conformational flip from syn to anti conformation of 8-Br-dG to favor loop-tetrad interaction and preserve the overall TBA stability.
Note: Versió postprint del document publicat a:
It is part of: Biochimica et Biophysica Acta-General Subjects, 2017, vol. 1861, num. 5, Part B, p. 1205-1212
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ISSN: 0304-4165
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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