1vtw | pdb_00001vtw

AT Base Pairs Are Less Stable than GC Base Pairs in Z-DNA: The Crystal Structure of D(M(5)CGTAM(5)CG)

spinqualitylabelsall models 1vtw, resolution 1.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1vtw is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: 5CM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Two hexanucleoside pentaphosphates , 5-methyl and 5-bromo cytosine derivatives of d( CpGpTpApCpG ) have been synthesized, crystallized, and their three-dimensional structure solved. They both form left-handed Z-DNA and the methylated derivative has been refined to 1.2 A resolution. These are the first crystal Z-DNA structures that contain AT base pairs. The overall form of the molecule is very similar to that of the unmethylated or the fully methylated (dC-dG)3 hexamer although there are slight changes in base stacking. However, significant differences are found in the hydration of the helical groove. When GC base pairs are present, the helical groove is systematically filled with two water molecules per base pair hydrogen bonded to the bases. Both of these water molecules are not seen in the electron density map in the segments of the helix containing AT base pairs, probably because of solvent disorder. This could be one of the features that makes AT base pairs form Z-DNA less readily than GC base pairs. AT base pairs are less stable than GC base pairs in Z-DNA: the crystal structure of d(m5CGTAm5CG).,Wang AH, Hakoshima T, van der Marel G, van Boom JH, Rich A Cell. 1984 May;37(1):321-31. PMID:6722876 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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