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Nucleic Acids Research Advance Access published online on December 22, 2008
Nucleic Acids Research, doi:10.1093/nar/gkn990
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© 2008 The Author(s)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Structural Biology

A novel chair-type G-quadruplex formed by a Bombyx mori telomeric sequence

Samir Amrane, Rita Wan Lin Ang, Zhong Ming Tan, Chun Li, Joefina Kim Cheow Lim, Jocelyn Mei Wen Lim, Kah Wai Lim and Anh Tuân Phan*

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371

*To whom correspondence should be addressed. Tel: +65 6514 1915; Fax: +65 6794 1325; Email: phantuan{at}ntu.edu.sg

Received September 2, 2008. Revised November 23, 2008. Accepted November 24, 2008.

Recently, the human telomeric d[TAGGG(TTAGGG)3] sequence has been shown to form in K+ solution an intramolecular (3+1) G-quadruplex structure, whose G-tetrad core contains three strands oriented in one direction and the fourth in the opposite direction. Here we present a study on the structure of the Bombyx mori telomeric d[TAGG(TTAGG)3] sequence, which differs from the human counterpart only by one G deletion in each repeat. We found that this sequence adopted multiple G-quadruplex structures in K+ solution. We have favored a major G-quadruplex form by a judicious U-for-T substitution in the sequence and determined the folding topology of this form. We showed by NMR that this was a new chair-type intramolecular G-quadruplex which involved a two-layer antiparallel G-tetrad core and three edgewise loops. Our result highlights the effect of G-tract length on the folding topology of G-quadruplexes, but also poses the question of whether a similar chair-type G-quadruplex fold exists in the human telomeric sequences.


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K. W. Lim, P. Alberti, A. Guedin, L. Lacroix, J.-F. Riou, N. J. Royle, J.-L. Mergny, and A. T. Phan
Sequence variant (CTAGGG)n in the human telomere favors a G-quadruplex structure containing a G{middle dot}C{middle dot}G{middle dot}C tetrad
Nucleic Acids Res., October 1, 2009; 37(18): 6239 - 6248.
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