133d | pdb_0000133d

THE CRYSTAL STRUCTURE OF N4-METHYLCYTOSINE.GUANOSIN BASE-PAIRS IN THE SYNTHETIC HEXANUCLEOTIDE D(CGCGM(4)CG)

spinqualitylabelsall models 133d, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 133d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: C34 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The structure of d(CGCGm4CG) were m4C = N4-methylcytosine has been determined by crystallographic methods. The crystals are multifaced prisms, with orthorhombic space group P2(1)2(1)2(1) and unit cell dimensions of a = 17.98, b = 30.77 and c = 44.75A. The asymmetric unit consists of one duplex of hexanucleotide and 49 waters. The R-factor is 0.189 for 1495 reflections with F > or = sigma(F) to a resolution limit of 1.8A. The double helix has a Z-DNA type structure which appears to be intermediate in structure to the two previously characterised structure types for Z-DNA hexamers. The two m4C.G base-pairs adopt structures that are very similar to those of the equivalent base-pairs in the structure of the native sequence d(CGCGCG) except for the presence of the methyl groups which are trans to the N3 atoms of their parent nucleotides and protrude into the solvent region. The introduction of the modified base-pairs into the d(CGCGCG) duplex appears to have a minimal effect on the overall base-pair morphology of the Z-DNA duplex. The crystal structure of N4-methylcytosine.guanosine base-pairs in the synthetic hexanucleotide d(CGCGm4CG).,Cervi AR, Guy A, Leonard GA, Teoule R, Hunter WN Nucleic Acids Res. 1993 Dec 11;21(24):5623-9. PMID:8284207 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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