2p8d

The Structure of the Dickerson Sequence with an Incorporated CeNA Residue

spinqualitylabelsall models 2p8d, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2p8d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NCO NonStd Res: XAR Related: 2h0n Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Cyclohexene nucleic acids (CeNA), which are characterized by the presence of a cyclohexene moiety instead of a natural (deoxy)ribose sugar, are known to increase the thermal and enzymatic stability when incorporated in RNA oligonucleotides. As it has been demonstrated that even a single cyclohexenyl nucleoside, when incorporated in an oligonucleotide, can have a profound effect on the biological activity of the oligonucleotide, further research is warranted to study the complex of such oligonucleotides with target proteins. In order to analyse the influence of CeNA residues onto the helix conformation and hydration of natural nucleic acid structures, a cyclohexenyl-adenine building block (xAr) was incorporated into the Dickerson sequence CGCGA(xAr)TTCGCG. The crystal structure of this sequence determined to a resolution of 1.90 A. The global helix belongs to the B-type family and shows a water spine, which is partially broken up by the apolar cyclohexene residue. The cyclohexene ring adopts the (2)E-conformation allowing a better incorporation of the residue in the dodecamer sequence. The crystal packing is stabilized by cobalt hexamine residues and belongs to space group P222(1), never before reported for nucleic acids. Influence of the incorporation of a cyclohexenyl nucleic acid (CeNA) residue onto the sequence d(CGCGAATTCGCG).,Robeyns K, Herdewijn P, Van Meervelt L Nucleic Acids Res. 2008 Mar;36(5):1407-14. Epub 2007 Dec 26. PMID:18160414 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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