2e4i

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Human Telomeric DNA mixed-parallel/antiparallel quadruplex under Physiological Ionic Conditions Stabilized by Proper Incorporation of 8-Bromoguanosines

Overview

The structure of human telomeric DNA is controversial; it depends upon the, sequence contexts and the methodologies used to determine it. The solution, structure in the presence of K(+) is particularly interesting, but the, structure is yet to be elucidated, due to possible conformational, heterogeneity. Here, a unique strategy is applied to stabilize one such, structure in a K(+) solution by substituting guanosines with, 8-bromoguanosines at proper positions. The resulting spectra are cleaner, and led to determination of the structure at a high atomic resolution., This demonstrates that the application of 8-bromoguanosine is a powerful, tool to overcome the difficulty of nucleic acid structure determination, arising from conformational heterogeneity. The obtained structure is a, mixed-parallel/antiparallel quadruplex. The structure of telomeric DNA was, recently reported in another study, in which stabilization was brought, about by mutation and resultant additional interactions [Luu KN, Phan AT, Kuryavyi V, Lacroix L & Patel DJ (2006) Structure of the human telomere in, K(+) solution: an intramolecular (3+1) G-quadruplex scaffold. J Am Chem, Soc 128, 9963-9970]. The structure of the guanine tracts was similar, between the two. However, a difference was seen for loops connecting, guanine tracts, which may play a role in the higher order arrangement of, telomeres. Our structure can be utilized to design a small molecule which, stabilizes the quadruplex. This type of molecule is supposed to inhibit a, telomerase and thus is expected to be a candidate anticancer drug.

About this Structure

2E4I is a Single protein structure of sequence from [1]. Full crystallographic information is available from OCA.

Reference

Structure of a human telomeric DNA sequence stabilized by 8-bromoguanosine substitutions, as determined by NMR in a K+ solution., Matsugami A, Xu Y, Noguchi Y, Sugiyama H, Katahira M, FEBS J. 2007 Jul;274(14):3545-56. Epub 2007 Jun 11. PMID:17561958

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