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Journal of Chemistry
Volume 2015 (2015), Article ID 473051, 6 pages
Research Article

Unusual Chair-Like G-Quadruplex Structures: Heterochiral TBA Analogues Containing Inversion of Polarity Sites

Dipartimento di Farmacia, Università degli Studi di Napoli Federico II, Via D. Montesano, 49-80131 Naples, Italy

Received 2 December 2014; Revised 9 February 2015; Accepted 12 February 2015

Academic Editor: Shu Taira

Copyright © 2015 Antonella Virgilio et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Heterochiral oligodeoxynucleotides based on the thrombin binding aptamer sequence, namely, 5′gg3′-3′TT5′-5′ggtgtgg3′-3′TT5′-5′gg3′ (H1), 5′gg3′-3′TT5′-5′gg3′-3′TGT5′-5′gg3′-3′TT5′-5′gg3′ (H2), and 5′gGTTGgtgtgGTTGg3′ (H3), where lower case letters indicate L-residues, have been investigated in their ability to fold in G-quadruplex structures through a combination of gel electrophoresis, circular dichroism, and UV spectroscopy techniques. In H1 and H2 inversions of polarity sites have been introduced to control the strand direction in the loop regions. Collected data suggest that all modified sequences are able to fold in chair-like G-quadruplexes mimicking the original TBA structure.