1d7z: Difference between revisions

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[[Image:1d7z.gif|left|200px]]
{{Seed}}
[[Image:1d7z.png|left|200px]]


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{{STRUCTURE_1d7z|  PDB=1d7z  |  SCENE=  }}  
{{STRUCTURE_1d7z|  PDB=1d7z  |  SCENE=  }}  


'''CRYSTAL STRUCTURE OF A HEXITOL NUCLEIC ACID (HNA) DUPLEX AT 2.2 A RESOLUTION'''
===CRYSTAL STRUCTURE OF A HEXITOL NUCLEIC ACID (HNA) DUPLEX AT 2.2 A RESOLUTION===




==Overview==
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A huge variety of chemically modified oligonucleotide derivatives has been synthesized for possible antisense applications. One such derivative, hexitol nucleic acid (HNA), is a DNA analogue containing the standard nucleoside bases, but with a phosphorylated 1',5'-anhydrohexitol backbone. Hexitol nucleic acids are some of the strongest hybridizing antisense compounds presently known, but HNA duplexes are even more stable. We present here the first high-resolution structure of a double helical nucleic acid with all sugars being hexitols. Although designed to have a restricted conformational flexibility, the hexitol oligomer h(GTGTACAC) is able to crystallize in two different double helical conformations. Both structures display a high x-displacement, normal Watson-Crick base pairing, similar base stacking patterns, and a very deep major groove together with a minor groove with increased hydrophobicity. One of the conformations displays a major groove which is wide enough to accommodate a second HNA double helix resulting in the formation of a double helix of HNA double helices. Both structures show most similarities with the A-type helical structure, the anhydrohexitol chair conformation thereby acting as a good mimic for the furanose C3'-endo conformation observed in RNA. As compared to the quasi-linear structure of homo-DNA, the axial position of the base in HNA allows efficient base stacking and hence double helix formation.
The line below this paragraph, {{ABSTRACT_PUBMED_11829600}}, adds the Publication Abstract to the page
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{{ABSTRACT_PUBMED_11829600}}


==About this Structure==
==About this Structure==
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[[Category: Double helix]]
[[Category: Double helix]]
[[Category: Hexitol nucleic acid]]
[[Category: Hexitol nucleic acid]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 13:33:08 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 22:39:01 2008''

Revision as of 19:39, 30 June 2008

File:1d7z.png

Template:STRUCTURE 1d7z

CRYSTAL STRUCTURE OF A HEXITOL NUCLEIC ACID (HNA) DUPLEX AT 2.2 A RESOLUTION

Template:ABSTRACT PUBMED 11829600

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structure of double helical hexitol nucleic acids., Declercq R, Van Aerschot A, Read RJ, Herdewijn P, Van Meervelt L, J Am Chem Soc. 2002 Feb 13;124(6):928-33. PMID:11829600

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