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2akg

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[[Image:2akg.gif|left|200px]]
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{{STRUCTURE_2akg| PDB=2akg | SCENE= }}
{{STRUCTURE_2akg| PDB=2akg | SCENE= }}
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'''Thallium form of the G-Quadruplex from Oxytricha Nova, d(G4T4G4)2'''
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===Thallium form of the G-Quadruplex from Oxytricha Nova, d(G4T4G4)2===
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==Overview==
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Monovalent cations play an important role in many biological functions. The guanine rich sequence, d(G4T4G4), requires monovalent cations for formation of the G-quadruplex, d(G4T4G4)2. This requirement can be satisfied by thallium (Tl+), a potassium (K+) surrogate. To verify that the structure of d(G4T4G4)2 in the presence of Tl+ is similar to the K+-form of the G-quadruplex, the solution structure of the Tl+-form of d(G4T4G4)2 was determined. The 10 lowest energy structures have an all atom RMSD of 0.76 +/- 0.16 A. Comparison of this structure to the identical G-quadruplex formed in the presence of K+ validates the isomorphous nature of Tl+ and K+. Using a 1H-205Tl spin-echo difference experiment we show that, in the Tl+-form of d(G4T4G4)2, small scalar couplings (&lt;1 Hz) exist between 205Tl and protons in the G-quadruplex. These data comprise the first 1H-205Tl scalar couplings observed in a biological system and have the potential to provide important constraints for structure determination. These experiments can be applied to any system in which the substituted Tl+ cations are in slow exchange with the bulk ions in solution.
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(as it appears on PubMed at http://www.pubmed.gov), where 16305263 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16305263}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AKG OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AKG OCA].
==Reference==
==Reference==
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[[Category: G-quadruplex]]
[[Category: G-quadruplex]]
[[Category: Thallium]]
[[Category: Thallium]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 19:09:29 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 16:54:36 2008''

Revision as of 13:54, 27 July 2008

Image:2akg.png

Template:STRUCTURE 2akg

Thallium form of the G-Quadruplex from Oxytricha Nova, d(G4T4G4)2

Template:ABSTRACT PUBMED 16305263

About this Structure

Full experimental information is available from OCA.

Reference

205Tl NMR methods for the characterization of monovalent cation binding to nucleic acids., Gill ML, Strobel SA, Loria JP, J Am Chem Soc. 2005 Nov 30;127(47):16723-32. PMID:16305263

Page seeded by OCA on Sun Jul 27 16:54:36 2008

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