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@article{1102673, author = {Rache, Aurore De and Kejnovská, Iva and Vorlíčková, Michaela and BuessandHerman, Claudine}, article_location = {WEINHEIM}, article_number = {14}, doi = {http://dx.doi.org/10.1002/chem.201103381}, keywords = {circular dichroism; DNA structures; G-quadruplexes; hexa-ammine ruthenium; thermal difference spectra}, language = {eng}, issn = {0947-6539}, journal = {Chemistry - A European Journal}, title = {Elongated Thrombin Binding Aptamer: A G-Quadruplex Cation-Sensitive Conformational Switch}, url = {http://www.sciencedirect.com/science/article/pii/S0925857415000658}, volume = {18}, year = {2012} }
TY - JOUR ID - 1102673 AU - Rache, Aurore De - Kejnovská, Iva - Vorlíčková, Michaela - Buess-Herman, Claudine PY - 2012 TI - Elongated Thrombin Binding Aptamer: A G-Quadruplex Cation-Sensitive Conformational Switch JF - Chemistry - A European Journal VL - 18 IS - 14 SP - 4392-4400 EP - 4392-4400 PB - WILEY-VCH SN - 09476539 KW - circular dichroism KW - DNA structures KW - G-quadruplexes KW - hexa-ammine ruthenium KW - thermal difference spectra UR - http://www.sciencedirect.com/science/article/pii/S0925857415000658 N2 - Aptamer-based biosensors offer promising perspectives for high performance, specific detection of proteins. The thrombin binding aptamer (TBA) is a G-quadruplex-forming DNA sequence, which is frequently elongated at one end to increase its analytical performances in a biosensor configuration. Herein, we investigate how the elongation of TBA at its 5' end affects its structure and stability. Circular dichroism spectroscopy shows that TBA folds in an antiparallel G-quadruplex conformation with all studied cations (Ba2+, Ca2+, K+, Mg2+, Na+, NH4+, Sr2+ and the [Ru(NH3)6]2+/3+ redox marker) whereas other structures are adopted by the elongated aptamers in the presence of some of these cations. The stability of each structure is evaluated on the basis of UV spectroscopy melting curves. Thermal difference spectra confirm the quadruplex character of all conformations. The elongated sequences can adopt a parallel or an antiparallel structure, depending on the nature of the cation; this can potentially confer an ion-sensitive switch behavior. This switch property is demonstrated with the frequently employed redox complex [Ru(NH3)6]3+, which induces the parallel conformation at very low concentrations (10 equiv per strand). The addition of large amounts of K+ reverts the conformation to the antiparallel form, and opens interesting perspectives for electrochemical biosensing or redox-active responsive devices. ER -
RACHE, Aurore De, Iva KEJNOVSKÁ, Michaela VORLÍČKOVÁ a Claudine BUESS-HERMAN. Elongated Thrombin Binding Aptamer: A G-Quadruplex Cation-Sensitive Conformational Switch. \textit{Chemistry - A European Journal}. WEINHEIM: WILEY-VCH, 2012, roč.~18, č.~14, s.~4392-4400. ISSN~0947-6539. Dostupné z: https://dx.doi.org/10.1002/chem.201103381.
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