1i0k: Difference between revisions

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[[Image:1i0k.gif|left|200px]]
{{Seed}}
[[Image:1i0k.png|left|200px]]


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{{STRUCTURE_1i0k|  PDB=1i0k  |  SCENE=  }}  
{{STRUCTURE_1i0k|  PDB=1i0k  |  SCENE=  }}  


'''1.05 A STRUCTURE OF THE A-DECAMER GCGTATACGC WITH A SINGLE 2'-O-METHYL-[TRI(OXYETHYL)] THYMINE IN PLACE OF T6, MEDIUM CS-SALT'''
===1.05 A STRUCTURE OF THE A-DECAMER GCGTATACGC WITH A SINGLE 2'-O-METHYL-[TRI(OXYETHYL)] THYMINE IN PLACE OF T6, MEDIUM CS-SALT===




==Overview==
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The observation of light metal ions in nucleic acids crystals is generally a fortuitous event. Sodium ions in particular are notoriously difficult to detect because their X-ray scattering contributions are virtually identical to those of water and Na(+.)O distances are only slightly shorter than strong hydrogen bonds between well-ordered water molecules. We demonstrate here that replacement of Na(+) by K(+), Rb(+) or Cs(+) and precise measurements of anomalous differences in intensities provide a particularly sensitive method for detecting alkali metal ion-binding sites in nucleic acid crystals. Not only can alkali metal ions be readily located in such structures, but the presence of Rb(+) or Cs(+) also allows structure determination by the single wavelength anomalous diffraction technique. Besides allowing identification of high occupancy binding sites, the combination of high resolution and anomalous diffraction data established here can also pinpoint binding sites that feature only partial occupancy. Conversely, high resolution of the data alone does not necessarily allow differentiation between water and partially ordered metal ions, as demonstrated with the crystal structure of a DNA duplex determined to a resolution of 0.6 A.
The line below this paragraph, {{ABSTRACT_PUBMED_11222771}}, adds the Publication Abstract to the page
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{{ABSTRACT_PUBMED_11222771}}


==About this Structure==
==About this Structure==
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[[Category: A-form double helix]]
[[Category: A-form double helix]]
[[Category: Modified sugar]]
[[Category: Modified sugar]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:26:02 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:13:52 2008''

Revision as of 07:13, 1 July 2008

File:1i0k.png

Template:STRUCTURE 1i0k

1.05 A STRUCTURE OF THE A-DECAMER GCGTATACGC WITH A SINGLE 2'-O-METHYL-[TRI(OXYETHYL)] THYMINE IN PLACE OF T6, MEDIUM CS-SALT

Template:ABSTRACT PUBMED 11222771

About this Structure

Full crystallographic information is available from OCA.

Reference

Detection of alkali metal ions in DNA crystals using state-of-the-art X-ray diffraction experiments., Tereshko V, Wilds CJ, Minasov G, Prakash TP, Maier MA, Howard A, Wawrzak Z, Manoharan M, Egli M, Nucleic Acids Res. 2001 Mar 1;29(5):1208-15. PMID:11222771

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