2h9s

[[Image:2h9s.gif|left|200px]]<br /><applet load="2h9s" size="350" color="white" frame="true" align="right" spinBox="true"

caption="2h9s, resolution 1.75&Aring;" />

'''Crystal Structure of Homo-DNA and Nature's Choice of Pentose over Hexose in the Genetic System'''<br />

==Overview==

An experimental rationalization of the structure type encountered in DNA, and RNA by systematically investigating the chemical and physical, properties of alternative nucleic acids has identified systems with a, variety of sugar-phosphate backbones that are capable of Watson-Crick base, pairing and in some cases cross-pairing with the natural nucleic acids., The earliest among the model systems tested to date, (4' --&gt; 6')-linked, oligo(2',3'-dideoxy-beta-d-glucopyranosyl)nucleotides or homo-DNA, shows, stable self-pairing, but the pairing rules for the four natural bases are, not the same as those in DNA. However, a complete interpretation and, understanding of the properties of the hexapyranosyl (4' --&gt; 6') family of, nucleic acids has been impeded until now by the lack of detailed, 3D-structural data. We have determined the crystal structure of a homo-DNA, octamer. It reveals a weakly twisted right-handed duplex with a strong, inclination between the hexose-phosphate backbones and base-pair axes, and, highly irregular values for helical rise and twist at individual base, steps. The structure allows a rationalization of the inability of allo-, altro-, and glucopyranosyl-based oligonucleotides to form stable pairing, systems.

 

==About this Structure==

2H9S is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/ ] with <scene name='pdbligand=MG:'>MG</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2H9S OCA].

 

Crystal structure of homo-DNA and nature's choice of pentose over hexose in the genetic system., Egli M, Pallan PS, Pattanayek R, Wilds CJ, Lubini P, Minasov G, Dobler M, Leumann CJ, Eschenmoser A, J Am Chem Soc. 2006 Aug 23;128(33):10847-56. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16910680 16910680]

[[Category: Protein complex]]

[[Category: Egli, M.]]

[[Category: Pallan, P.S.]]

[[Category: dideoxyglucopyranose octamer]]

[[Category: glucopyranosyl nucleic acid]]

[[Category: hexose nucleic acid]]