2e4i
From Proteopedia
(New page: 200px<br /><applet load="2e4i" size="350" color="white" frame="true" align="right" spinBox="true" caption="2e4i" /> '''Human Telomeric DNA mixed-parallel/antiparal...) |
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==Overview== | ==Overview== | ||
| - | The structure of human telomeric DNA is controversial; it depends upon the | + | 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== | ==About this Structure== | ||
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[[Category: telomere]] | [[Category: telomere]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:05:54 2008'' |
Revision as of 15:05, 21 February 2008
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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
Page seeded by OCA on Thu Feb 21 17:05:54 2008
Categories: Single protein | Katahira, M. | Matsugami, A. | Noguchi, Y. | Sugiyama, H. | Xu, Y. | Dna | Mixed-parallel/antiparallel | Nmr | Quadruplex | Structure | Telomere
