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[[Image:1d7z.gif|left|200px]]


{{Structure
==CRYSTAL STRUCTURE OF A HEXITOL NUCLEIC ACID (HNA) DUPLEX AT 2.2 A RESOLUTION==
|PDB= 1d7z |SIZE=350|CAPTION= <scene name='initialview01'>1d7z</scene>, resolution 2.21&Aring;
<StructureSection load='1d7z' size='340' side='right'caption='[[1d7z]], [[Resolution|resolution]] 2.21&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND=  
<table><tr><td colspan='2'>[[1d7z]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1D7Z OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1D7Z FirstGlance]. <br>
|ACTIVITY=  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.21&#8491;</td></tr>
|GENE=  
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=6HA:1,5-ANHYDRO-2,3-DIDEOXY-2-(ADENIN-9-YL)-6-O-PHOSPHORYL-D-ARABINO-HEXITOL'>6HA</scene>, <scene name='pdbligand=6HC:1,5-ANHYDRO-2,3-DIDEOXY-2-(CYTOSIN-1-YL)-6-O-PHOSPHORYL-D-ARABINO-HEXITOL'>6HC</scene>, <scene name='pdbligand=6HG:1,5-ANHYDRO-2,3-DIDEOXY-2-(GUANIN-9-YL)-6-O-PHOSPHORYL-D-ARABINO-HEXITOL'>6HG</scene>, <scene name='pdbligand=6HT:1,5-ANHYDRO-2,3-DIDEOXY-2-(THYMIN-1-YL)-6-O-PHOSPHORYL-D-ARABINO-HEXITOL'>6HT</scene></td></tr>
}}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1d7z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1d7z OCA], [https://pdbe.org/1d7z PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1d7z RCSB], [https://www.ebi.ac.uk/pdbsum/1d7z PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1d7z ProSAT]</span></td></tr>
 
</table>
'''CRYSTAL STRUCTURE OF A HEXITOL NUCLEIC ACID (HNA) DUPLEX AT 2.2 A RESOLUTION'''
__TOC__
 
</StructureSection>
 
[[Category: Large Structures]]
==Overview==
[[Category: Declercq R]]
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.
[[Category: Van Meervelt L]]
 
==About this Structure==
1D7Z is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/ ]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1D7Z 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:[http://www.ncbi.nlm.nih.gov/pubmed/11829600 11829600]
[[Category: Protein complex]]
[[Category: Declercq, R.]]
[[Category: Meervelt, L Van.]]
[[Category: dna analogue]]
[[Category: double helix]]
[[Category: hexitol nucleic acid]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:34:12 2008''

Latest revision as of 06:50, 7 February 2024

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

1d7z, resolution 2.21Å

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